{"id":343058,"date":"2022-12-23T15:00:43","date_gmt":"2022-12-23T15:00:43","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=343058"},"modified":"-0001-11-30T00:00:00","modified_gmt":"2022-12-23T15:00:43","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=343058","title":{"rendered":"OSPFv2: \u043f\u0435\u0442\u043b\u0438 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \u0431\u0435\u0437 \u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0430\u0446\u0438\u0438 \u0438 \u0441\u043c\u0441<\/span>"},"content":{"rendered":"
<\/div>\n
\n
\n
\n
\n

\u041d\u0435 \u0442\u0430\u043a \u0434\u0430\u0432\u043d\u043e \u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b \u043f\u0440\u043e \u043e\u0434\u043d\u0443 \u0438\u0437 \u043f\u0440\u0438\u0447\u0438\u043d<\/a> \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044f RFC 2328<\/a> \u043d\u0430 \u0441\u043c\u0435\u043d\u0443 RFC 1583<\/a>. \u0412\u043f\u0440\u043e\u0447\u0435\u043c, \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f \u043f\u0435\u0442\u043b\u0438 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043e\u0432\u0441\u0435\u043c \u043d\u0435 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439. \u0422\u0435 \u0438\u0437 \u0432\u0430\u0441, \u043a\u0442\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u043b \u043d\u0430 RFC 2178<\/a>, \u0441\u043a\u043e\u0440\u0435\u0435 \u0432\u0441\u0435\u0433\u043e, \u0443\u0436\u0435 \u0434\u043e\u0433\u0430\u0434\u044b\u0432\u0430\u044e\u0442\u0441\u044f, \u043e \u0447\u0435\u043c \u043f\u043e\u0439\u0434\u0451\u0442 \u0440\u0435\u0447\u044c \u0434\u0430\u043b\u044c\u0448\u0435.<\/p>\n

\u041f\u043e\u043c\u0438\u043c\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0430\u0433\u0440\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432, RFC 2328 \u0442\u0430\u043a\u0436\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u043b \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430 \u0434\u043b\u044f \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u043e\u0432.<\/p>\n

\n

Otherwise, compare the cost of this new AS external path to the ones present in the table. Type 1 external paths are always shorter than type 2 external paths. Type 1 external paths are compared by looking at the sum of the distance to the forwarding address and the advertised type 1 metric (X+Y). Type 2 external paths are compared by looking at the advertised type 2 metrics, and then if necessary, the distance to the forwarding addresses.<\/em><\/p>\n

RFC 1583, section 16.4<\/a><\/p>\n<\/blockquote>\n

\n

Compare the AS external path described by the LSA with the existing paths in N’s routing table entry, as follows. If the new path is preferred, it replaces the present paths in N’s routing table entry. If the new path is of equal preference, it is added to N’s routing table entry’s list of paths.<\/em><\/p>\n

(a) Intra-area and inter-area paths are always preferred over AS external paths.<\/em><\/p>\n

(b) Type 1 external paths are always preferred over type 2 external paths. When all paths are type 2 external paths, the paths with the smallest advertised type 2 metric are always preferred.<\/em><\/p>\n

(c) If the new AS external path is still indistinguishable from the current paths in the N’s routing table entry, and RFC1583Compatibility is set to «disabled», select the preferred paths based on the intra-AS paths to the ASBR\/forwarding addresses, as specified in Section 16.4.1.<\/em><\/p>\n

(d) If the new AS external path is still indistinguishable from the current paths in the N’s routing table entry, select the preferred path based on a least cost comparison. Type 1 external paths are compared by looking at the sum of the distance to the forwarding address and the advertised type 1 metric (X+Y). Type 2 external paths advertising equal type 2 metrics are compared by looking at the distance to the forwarding addresses.<\/em><\/p>\n

RFC 2328, <\/em>section 16.4<\/em><\/a><\/p>\n<\/blockquote>\n

\n

1. Intra-area paths using non-backbone areas are always the most preferred.
2. The other paths, intra-area backbone paths and inter-area paths, are of equal preference.<\/em><\/p>\n

RFC 2328, <\/em>section 16.4.1<\/em><\/a><\/p>\n<\/blockquote>\n

\u0412\u043c\u0435\u0441\u0442\u043e \u043f\u0440\u044f\u043c\u043e\u0433\u043e \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u044f \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0443 \u043e\u0431\u043e\u0431\u0449\u0438\u0442\u044c \u0441\u0443\u0442\u044c \u0440\u0430\u0437\u043b\u0438\u0447\u0438\u0439: <\/p>\n

    \n
  1. \n

    RFC 1583 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u044b \u043e\u0442 \u0440\u0430\u0437\u043d\u044b\u0445 ASBR \u0441\u0443\u0433\u0443\u0431\u043e \u043f\u043e \u043c\u0435\u0442\u0440\u0438\u043a\u0435.<\/p>\n<\/li>\n

  2. \n

    RFC 2328, \u0432 \u0441\u0432\u043e\u044e \u043e\u0447\u0435\u0440\u0435\u0434\u044c, \u043e\u0442\u0434\u0430\u0451\u0442 \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0435\u043d\u0438\u0435 ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u043c\u0441\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u0442\u043e\u0439 \u0436\u0435 \u043d\u0435\u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b; \u0435\u0441\u043b\u0438 \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432\u044b\u0431\u043e\u0440 \u0432\u0441\u0451 \u0435\u0449\u0451 \u043d\u0435 \u0443\u0434\u0430\u043b\u043e\u0441\u044c, \u0442\u043e\u0433\u0434\u0430 OSPF \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0434\u043e ASBR \u0442\u0430\u043a \u0436\u0435, \u043a\u0430\u043a \u0438 RFC 1583.<\/p>\n<\/li>\n<\/ol>\n

    \u041f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043d\u0430\u0441 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0443\u044e\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430:<\/p>\n

      \n
    1. \n

      \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442 ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0445\u0441\u044f \u0432 \u0442\u043e\u0439 \u0436\u0435 \u043d\u0435\u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u0435;<\/p>\n<\/li>\n

    2. \n

      \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0448\u0438\u0445\u0441\u044f \u0432 \u0437\u043e\u043d\u0435 0, \u0438 ASBR \u0438\u0437 \u0434\u0440\u0443\u0433\u0438\u0445 \u0437\u043e\u043d.<\/p>\n<\/li>\n<\/ol>\n

      \u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439:<\/p>\n

      <\/figcaption><\/figure>\n

      ASBR \u043e\u0431\u043c\u0435\u043d\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u043c\u0438 \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u0430\u043c\u0438 \u0441 \u0443\u0437\u043b\u043e\u043c BGP: \u043f\u043e\u043b\u0443\u0447\u0430\u044e\u0442 1.1.1.1\/32 \u0438 \u0430\u043d\u043e\u043d\u0441\u0438\u0440\u0443\u044e\u0442 3.3.3.3\/32. \u041f\u043e\u043c\u0438\u043c\u043e \u044d\u0442\u043e\u0433\u043e, ASBR \u043e\u0431\u044a\u044f\u0432\u043b\u044f\u044e\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 OSPF \u0434\u043e\u043c\u0435\u043d. \u0414\u0432\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438\u043c\u0435\u044e\u0442 \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0439 \u0432\u0435\u0441, \u0438\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043e\u0442\u043c\u0435\u0447\u0435\u043d\u044b \u043a\u0440\u0430\u0441\u043d\u044b\u043c \u0446\u0432\u0435\u0442\u043e\u043c. \u041e\u0441\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 \u043d\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0430, \u0432\u0441\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u2013 \u0442\u043e\u043b\u044c\u043a\u043e \u043b\u043e\u0432\u043a\u043e\u0441\u0442\u044c \u0440\u0443\u043a \u0438 \u043d\u0438\u043a\u0430\u043a\u043e\u0439 \u043c\u0430\u0433\u0438\u0438.<\/p>\n

      BGP#sho run | section interface|router interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet0\/0  ip address 192.168.16.1 255.255.255.0 interface FastEthernet0\/1  ip address 192.168.12.1 255.255.255.0 router bgp 1  no bgp default ipv4-unicast  neighbor 192.168.12.2 remote-as 100  neighbor 192.168.16.6 remote-as 100  !  address-family ipv4   network 1.1.1.1 mask 255.255.255.255   neighbor 192.168.12.2 activate   neighbor 192.168.16.6 activate<\/code><\/pre>\n
      ASBR1#sho run | s interface|router interface Loopback0  ip address 2.2.2.2 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.23.2 255.255.255.0  ip ospf 1 area 0  ip ospf cost 10 interface FastEthernet0\/1  ip address 192.168.12.2 255.255.255.0 router ospf 1  default-information originate always router bgp 100  no bgp default ipv4-unicast  neighbor 192.168.12.1 remote-as 1  !  address-family ipv4   network 3.3.3.3 mask 255.255.255.255   neighbor 192.168.12.1 activate<\/code><\/pre>\n
      ASBR2#sho run | section interface|router interface Loopback0  ip address 6.6.6.6 255.255.255.255  ip ospf 1 area 1 interface FastEthernet0\/0  ip address 192.168.16.6 255.255.255.0 interface FastEthernet0\/1  ip address 192.168.56.6 255.255.255.0  ip ospf 1 area 1 interface FastEthernet1\/0  ip address 192.168.46.6 255.255.255.0  ip ospf 1 area 1  ip ospf cost 100 router ospf 1  default-information originate always router bgp 100  no bgp default ipv4-unicast  neighbor 192.168.16.1 remote-as 1  !  address-family ipv4   network 3.3.3.3 mask 255.255.255.255   neighbor 192.168.16.1 activate<\/code><\/pre>\n
      ABR1#sho run | section interface|router interface Loopback0  ip address 4.4.4.4 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.45.4 255.255.255.0  ip ospf 1 area 0 interface FastEthernet0\/1  ip address 192.168.34.4 255.255.255.0  ip ospf 1 area 0 interface FastEthernet1\/0  ip address 192.168.46.4 255.255.255.0  ip ospf 1 area 1  ip ospf cost 100 router ospf 1<\/code><\/pre>\n
      ABR2#sho run | section interface|router interface Loopback0  ip address 5.5.5.5 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.45.5 255.255.255.0  ip ospf 1 area 0 interface FastEthernet0\/1  ip address 192.168.56.5 255.255.255.0  ip ospf 1 area 1 router ospf 1<\/code><\/pre>\n
      R#sho run | section interface|router interface Loopback0  ip address 3.3.3.3 255.255.255.255 interface FastEthernet0\/0  ip address 192.168.23.3 255.255.255.0  ip ospf cost 10 interface FastEthernet0\/1  ip address 192.168.34.3 255.255.255.0 router ospf 1  network 0.0.0.0 255.255.255.255 area 0<\/code><\/pre>\n
      \u041c\u043e\u0436\u0435\u0442 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u044c\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u0438 \u0442\u0430\u043a\u043e\u0439 \u043d\u0435\u0432\u0438\u043d\u043d\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0435 \u0443\u0437\u0435\u043b BGP \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c \u0441\u0432\u044f\u0437\u043d\u043e\u0441\u0442\u044c \u0434\u043e 3.3.3.3\/32, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c 1.1.1.1\/32 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430 \u0430\u0434\u0440\u0435\u0441\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0430.<\/p>\n
      BGP#ping 3.3.3.3 so lo 0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1  ..... Success rate is 0 percent (0\/5)<\/code><\/pre>\n
      \u0427\u0442\u043e, \u0432\u043f\u0440\u043e\u0447\u0435\u043c, \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u043d\u0435 \u043c\u0435\u0448\u0430\u0435\u0442 \u0441\u0435\u0442\u0438 \u0434\u043e\u0431\u0440\u043e\u0441\u043e\u0432\u0435\u0441\u0442\u043d\u043e \u0442\u0435\u0440\u044f\u0442\u044c \u0442\u0440\u0430\u0444\u0438\u043a. \u041c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c, \u0433\u0434\u0435-\u0442\u043e \u043f\u043e \u043f\u0443\u0442\u0438 \u043d\u0435 \u0445\u0432\u0430\u0442\u0430\u0435\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432?<\/p>\n
      BGP#traceroute 3.3.3.3 source 1.1.1.1 Type escape sequence to abort. Tracing the route to 3.3.3.3 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.16.6 12 msec 24 msec 20 msec   2 192.168.56.5 56 msec 16 msec 36 msec   3  *  *  *  <output omitted><\/code><\/pre>\n
      \u041f\u043e\u0445\u043e\u0436\u0435 \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e ABR1 \u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u0442 \u043f\u0440\u0438\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043a \u043d\u0435\u043c\u0443 \u043f\u0430\u043a\u0435\u0442\u044b. \u041e\u0434\u043d\u0430\u043a\u043e \u043f\u0435\u0440\u0432\u043e\u0435 \u0432\u043f\u0435\u0447\u0430\u0442\u043b\u0435\u043d\u0438\u0435 \u043e\u0431\u043c\u0430\u043d\u0447\u0438\u0432\u043e, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0435\u0441\u043b\u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c traceroute \u0441 \u0434\u0440\u0443\u0433\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b:<\/p>\n
      R#traceroute 1.1.1.1 source 3.3.3.3 Type escape sequence to abort. Tracing the route to 1.1.1.1 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.34.4 16 msec 16 msec 20 msec   2 192.168.34.3 20 msec 24 msec 16 msec   3 192.168.34.4 32 msec 36 msec 40 msec   4 192.168.34.3 36 msec 40 msec 36 msec <\u043d\u0443 \u0432\u044b \u043f\u043e\u043d\u044f\u043b\u0438><\/code><\/pre>\n
      <\/figcaption><\/figure>\n
      \u0415\u0441\u043b\u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430 \u0441\u0445\u0435\u043c\u0443, \u0442\u043e \u0432\u044b\u0431\u043e\u0440 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 \u0441\u0442\u043e\u0440\u043e\u043d\u0443 ASBR2 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u043c R \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0440\u0430\u0437\u0443\u043c\u043d\u044b\u043c:  <\/p>\n
      R#sho ip ospf border-routers                  OSPF Router with ID (3.3.3.3) (Process ID 1)   Base Topology (MTID 0)  Internal Router Routing Table Codes: i - Intra-area route, I - Inter-area route  i 4.4.4.4 [1] via 192.168.34.4, FastEthernet0\/1, ABR, Area 0, SPF 12 i 5.5.5.5 [2] via 192.168.34.4, FastEthernet0\/1, ABR, Area 0, SPF 12 i 2.2.2.2 [10] via 192.168.23.2, FastEthernet0\/0, ASBR, Area 0, SPF 12 I 6.6.6.6 [3] via 192.168.34.4, FastEthernet0\/1, ASBR, Area 0, SPF 12 I 6.6.6.6 [101] via 192.168.34.4, FastEthernet0\/1, ASBR, Area 0, SPF 12<\/code><\/pre>\n
      \u0410 \u0432\u043e\u0442 ABR1 \u0432\u0435\u0434\u0451\u0442 \u0441\u0435\u0431\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0442\u0440\u0430\u043d\u043d\u043e, \u043f\u043e \u043a\u0440\u0430\u0439\u043d\u0435\u0439 \u043c\u0435\u0440\u0435 \u043d\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u0437\u0433\u043b\u044f\u0434:<\/p>\n
      ABR1#sho ip ospf border-routers               OSPF Router with ID (4.4.4.4) (Process ID 1)   Base Topology (MTID 0)  Internal Router Routing Table Codes: i - Intra-area route, I - Inter-area route  i 5.5.5.5 [101] via 192.168.46.6, FastEthernet1\/0, ABR, Area 1, SPF 8 i 5.5.5.5 [1] via 192.168.45.5, FastEthernet0\/0, ABR, Area 0, SPF 9 i 2.2.2.2 [11] via 192.168.34.3, FastEthernet0\/1, ASBR, Area 0, SPF 9 i 6.6.6.6 [100] via 192.168.46.6, FastEthernet1\/0, ASBR, Area 1, SPF 8<\/code><\/pre>\n
      \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u043f\u0440\u0438\u0441\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0434\u043e ASBR2 \u0441 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u043e\u0431\u043e\u0438\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432. R \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u0442 \u043f\u0443\u0442\u044c \u0447\u0435\u0440\u0435\u0437 ABR2 \u0441 \u0432\u0435\u0441\u043e\u043c, \u0440\u0430\u0432\u043d\u044b\u043c 3; \u0432 \u0441\u0432\u043e\u044e \u043e\u0447\u0435\u0440\u0435\u0434\u044c, ABR1 \u043d\u0435 \u0438\u043c\u0435\u0435\u0442 \u043d\u0438 \u043c\u0430\u043b\u0435\u0439\u0448\u0435\u0433\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0435 \u0447\u0435\u0440\u0435\u0437 ABR2 \u0438 \u0432\u0438\u0434\u0438\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0443\u0442\u044c \u0441 \u0432\u0435\u0441\u043e\u043c, \u0440\u0430\u0432\u043d\u044b\u043c 101. \u041f\u0440\u0438\u0447\u0438\u043d\u0430 \u0442\u0430\u043a\u043e\u0433\u043e \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0437\u0430\u0438\u0447\u043d\u0430: ASBR2 \u0438 ABR1 \u043d\u0430\u0445\u043e\u0434\u044f\u0442\u0441\u044f \u0432 \u043e\u0434\u043d\u043e\u0439 \u0437\u043e\u043d\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 ABR1 \u043e\u0431\u044f\u0437\u0430\u043d \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043d\u0443\u0442\u0440\u0438\u0437\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0440\u0448\u0440\u0443\u0442. \u041a\u0430\u043a \u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435, \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c ASBR \u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0439 \u0440\u0430\u0437 \u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e \u043f\u0443\u0442\u0438 \u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430, \u0447\u0442\u043e \u0438 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0435\u0442\u043b\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438.<\/p>\n
      \u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0438\u043c \u0432\u0441\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u044b \u0434\u043e\u043c\u0435\u043d\u0430 \u0432 \u0440\u0435\u0436\u0438\u043c \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438 \u0441 RFC 2328:<\/p>\n
      R(config)#router ospf 1 R(config-router)#no compatible rfc1583<\/code><\/pre>\n
      R#traceroute 1.1.1.1 so 3.3.3.3 Type escape sequence to abort. Tracing the route to 1.1.1.1 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.34.4 20 msec 32 msec 12 msec   2 192.168.46.6 12 msec 20 msec 8 msec   3 192.168.16.1 4 msec 28 msec 16 msec<\/code><\/pre>\n
      ABR1#sho ip ro os                               <output omitted> Gateway of last resort is 192.168.46.6 to network 0.0.0.0  O*E2  0.0.0.0\/0 [110\/1] via 192.168.46.6, 00:02:00, FastEthernet0\/1 <output omitted><\/code><\/pre>\n
      \u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u043d\u0430\u043c \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u043f\u043e\u0431\u043e\u0440\u043e\u0442\u044c \u043f\u0435\u0442\u043b\u044e, \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u044f \u0441\u0442\u0430\u043b\u0430 \u043d\u0435\u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0439. R \u0441\u0447\u0438\u0442\u0430\u0435\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u044b \u0434\u043e ASBR1 (\u0432\u043d\u0443\u0442\u0440\u0438 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b) \u0438 ASBR2 (\u043c\u0435\u0436\u0437\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439) \u0440\u0430\u0432\u043d\u043e\u0446\u0435\u043d\u043d\u044b\u043c\u0438, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u0438\u0445 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e \u043c\u0435\u0442\u0440\u0438\u043a\u0435. \u041d\u0435 \u043b\u0443\u0447\u0448\u0435 \u043b\u0438 \u0431\u044b\u043b\u043e \u043e\u0442\u0434\u0430\u0442\u044c \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0435\u043d\u0438\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0443 \u0432\u043d\u0443\u0442\u0440\u0438 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b? \u0418\u043c\u0435\u043d\u043d\u043e \u0442\u0430\u043a \u0438 \u0434\u0443\u043c\u0430\u043b\u0438 \u0430\u0432\u0442\u043e\u0440\u044b RFC 2178:<\/p>\n
      \n
      1. Intra-area paths using non-backbone areas are always the most preferred.
      2. Otherwise, intra-area backbone paths are preferred.
      3. Inter-area paths are the least preferred.<\/em><\/p>\n
      RFC 2178, <\/em>section 16.4.1<\/em><\/a><\/p>\n<\/blockquote>\n
      \u0412\u043f\u0440\u043e\u0447\u0435\u043c, \u043d\u0430\u0448\u043b\u0430\u0441\u044c \u0432\u0435\u0441\u043e\u043c\u0430\u044f \u043f\u0440\u0438\u0447\u0438\u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430:<\/p>\n
      \n
      There is still the possibility of a routing loop in RFC 2178 when both <\/em> <\/p>\n
      1. virtual links are in use and
      2. the same external route is being imported by multiple ASBRs, each of which is in a separate area. <\/em> <\/p>\n
      To fix this problem, Section 16.4.1 has been revised. To choose the correct ASBR\/forwarding address, intra-area paths through non-backbone areas are always preferred. However, intra-area paths through the backbone area (Area 0) and inter-area paths are now of equal preference, and must be compared solely based on cost.<\/em><\/p>\n
      The reasoning behind this change is as follows. When virtual links are in use, an intra-area backbone path for one router can turn into an inter-area path in a router several hops closer to the destination. Hence, intra-area backbone paths and inter-area paths must be of equal preference. We can safely compare their costs, preferring the path with the smallest cost, due to the calculations in Section 16.3.<\/em><\/p>\n
      RFC 2328, <\/em>section G.2<\/em><\/a><\/p>\n<\/blockquote>\n
      \u041d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043c\u043d\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e, \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0439 OSPF \u0432 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0438\u0438 \u0441 RFC 2178 \u0432 \u043f\u0440\u0438\u0440\u043e\u0434\u0435 \u043d\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442. \u0422\u0443\u0442 \u043d\u0430 \u043f\u043e\u043c\u043e\u0449\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0439\u0442\u0438 \u0431\u043e\u0433\u0430\u0442\u043e\u0435 \u0432\u043e\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435. \u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0442\u0430\u043a\u0443\u044e \u0441\u0445\u0435\u043c\u0443:<\/p>\n
      <\/figcaption><\/figure>\n
       \u041f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043f\u043e RFC 2178:<\/p>\n
        \n
      1. \n
         R1 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 ASBR1 \u0438\u0437 \u0434\u0440\u0443\u0433\u043e\u0439 \u0437\u043e\u043d\u044b \u0441 ASBR2 \u0432 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u0435 (\u0447\u0435\u0440\u0435\u0437 virtual-link).<\/p>\n<\/li>\n
      2. \n
         ASBR2 \u0432 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u0435 \u043b\u0443\u0447\u0448\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 R1 \u0448\u043b\u0451\u0442 \u043f\u0430\u043a\u0435\u0442 \u0435\u043c\u0443.<\/p>\n<\/li>\n
      3. \n
         R2 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 ASBR1 \u0438 ASBR2, \u043a\u0430\u0436\u0434\u044b\u0439 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u0434\u0440\u0443\u0433\u043e\u0439 \u0437\u043e\u043d\u0435.<\/p>\n<\/li>\n
      4. \n
         ASBR1 \u0431\u043b\u0438\u0436\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 R2 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u0442 \u0435\u043c\u0443 \u043f\u0430\u043a\u0435\u0442 \u2013 \u043d\u0430\u0437\u0430\u0434 \u0432 \u0441\u0442\u043e\u0440\u043e\u043d\u0443 R1.<\/p>\n<\/li>\n<\/ol>\n
         \u041f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043f\u043e RFC 2328:<\/p>\n
          \n
        1. \n
           R1 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 ASBR1 \u0438\u0437 \u0434\u0440\u0443\u0433\u043e\u0439 \u0437\u043e\u043d\u044b \u0441 ASBR2 \u0432 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u0435 \u0438 \u0441\u0447\u0438\u0442\u0430\u0435\u0442 \u0438\u0445 \u0440\u0430\u0432\u043d\u043e\u0446\u0435\u043d\u043d\u044b\u043c\u0438.<\/p>\n<\/li>\n
        2. \n
          R1 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0434\u043e ASBR1 (2) \u0438 ASBR2 (13).<\/p>\n<\/li>\n
        3. \n
          ASBR1 \u0431\u043b\u0438\u0436\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 R1 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u0442 \u0435\u043c\u0443 \u043f\u0430\u043a\u0435\u0442 \u0447\u0435\u0440\u0435\u0437 ABR2.<\/p>\n<\/li>\n<\/ol>\n
          \u041a\u043e\u0440\u0435\u043d\u044c \u0437\u043b\u0430 \u0432 \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0445 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u044f\u0445 \u2013 \u043f\u043e\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442\u0430 ASBR \u043f\u043e \u043f\u0443\u0442\u0438 \u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430. RFC 2328 \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0442\u0430\u043a\u0438\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438 \u0446\u0435\u043d\u043e\u0439 \u043d\u0435\u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438. \u0410\u0432\u0442\u043e\u0440\u044b RFC \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u043b\u0438, \u0447\u0442\u043e \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u043f\u0443\u0442\u044c \u043e\u0431\u044b\u0447\u043d\u043e \u043b\u0443\u0447\u0448\u0435 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0433\u043e.<\/p>\n
          OSPF \u2013 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0441\u043b\u043e\u0436\u043d\u044b\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b \u0441 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u043e\u0439 \u0433\u0438\u0431\u043a\u043e\u0441\u0442\u044c\u044e. \u041a\u043e\u043d\u0435\u0447\u043d\u043e, \u0434\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0442\u0435\u043f\u0435\u043d\u0438 \u0435\u0433\u043e \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u043c\u043e\u0436\u043d\u043e \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c, \u043e\u0434\u043d\u0430\u043a\u043e \u043d\u0443\u0436\u043d\u043e \u043e\u0447\u0435\u043d\u044c \u0445\u043e\u0440\u043e\u0448\u043e \u043f\u043e\u043d\u0438\u043c\u0430\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f, \u0447\u0442\u043e\u0431\u044b \u043d\u0435 \u043f\u043e\u043f\u0430\u0441\u0442\u044c \u0432\u043f\u0440\u043e\u0441\u0430\u043a. \u0412 \u0446\u0435\u043b\u043e\u043c, \u043f\u0440\u0438\u043d\u0446\u0438\u043f KISS \u043a\u0430\u043a \u043d\u0435\u043b\u044c\u0437\u044f \u043b\u0443\u0447\u0448\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u043a OSPF. \u0415\u0441\u043b\u0438 \u0436\u0435 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c \u0431\u043e\u043b\u0435\u0435 \u0433\u0438\u0431\u043a\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b, \u0432\u044b\u0431\u043e\u0440 \u043e\u0447\u0435\u0432\u0438\u0434\u0435\u043d: \u0432\u0430\u043c \u043d\u0443\u0436\u0435\u043d \u0438\u043b\u0438 BGP, \u0438\u043b\u0438 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u043e\u0440 \u043f\u043e\u043b\u0443\u0447\u0448\u0435.<\/p>\n
          \u0421\u043f\u0430\u0441\u0438\u0431\u043e \u0437\u0430 \u0440\u0435\u0446\u0435\u043d\u0437\u0438\u044e: \u0410\u043d\u0430\u0441\u0442\u0430\u0441\u0438\u0438 \u041a\u0443\u0440\u0430\u043b\u0451\u0432\u043e\u0439<\/strong><\/p>\n
          \u041a\u0430\u043d\u0430\u043b \u0432 \u0422\u0435\u043b\u0435\u0433\u0440\u0430\u043c\u0435: https:\/\/t.me\/networking_it_ru<\/a><\/p>\n<\/p>\n<\/div>\n<\/div>\n<\/div>\n
            <\/div>\n
            
           \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438            https:\/\/habr.com\/ru\/post\/700384\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
          <\/div>\n
          \n
          \n
          \n
          \n
          \u041d\u0435 \u0442\u0430\u043a \u0434\u0430\u0432\u043d\u043e \u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b \u043f\u0440\u043e \u043e\u0434\u043d\u0443 \u0438\u0437 \u043f\u0440\u0438\u0447\u0438\u043d<\/a> \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044f RFC 2328<\/a> \u043d\u0430 \u0441\u043c\u0435\u043d\u0443 RFC 1583<\/a>. \u0412\u043f\u0440\u043e\u0447\u0435\u043c, \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f \u043f\u0435\u0442\u043b\u0438 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043e\u0432\u0441\u0435\u043c \u043d\u0435 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439. \u0422\u0435 \u0438\u0437 \u0432\u0430\u0441, \u043a\u0442\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u043b \u043d\u0430 RFC 2178<\/a>, \u0441\u043a\u043e\u0440\u0435\u0435 \u0432\u0441\u0435\u0433\u043e, \u0443\u0436\u0435 \u0434\u043e\u0433\u0430\u0434\u044b\u0432\u0430\u044e\u0442\u0441\u044f, \u043e \u0447\u0435\u043c \u043f\u043e\u0439\u0434\u0451\u0442 \u0440\u0435\u0447\u044c \u0434\u0430\u043b\u044c\u0448\u0435.<\/p>\n
          \u041f\u043e\u043c\u0438\u043c\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0430\u0433\u0440\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432, RFC 2328 \u0442\u0430\u043a\u0436\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u043b \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430 \u0434\u043b\u044f \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u043e\u0432.<\/p>\n
          \n
          Otherwise, compare the cost of this new AS external path to the ones present in the table.  Type 1 external paths are always shorter than type 2 external paths.  Type 1 external paths are compared by looking at the sum of the distance to the forwarding address and the advertised type 1 metric (X+Y).  Type 2 external paths are compared by looking at the  advertised type 2 metrics, and then if necessary, the distance to the forwarding addresses.<\/em><\/p>\n
          RFC 1583, section 16.4<\/a><\/p>\n<\/blockquote>\n
          \n
          Compare the AS external path described by the LSA with the existing paths in N’s routing table entry, as follows. If the new path is preferred, it replaces the present paths in N’s routing table entry.  If the new path is of equal preference, it is added to N’s routing table entry’s list of paths.<\/em><\/p>\n
          (a) Intra-area and inter-area paths are always preferred over AS external paths.<\/em><\/p>\n
          (b) Type 1 external paths are always preferred over type 2 external paths. When all paths are type 2 external paths, the paths with the smallest advertised type 2 metric are always preferred.<\/em><\/p>\n
          (c) If the new AS external path is still indistinguishable from the current paths in the N’s routing table entry, and RFC1583Compatibility is set to «disabled», select the preferred paths based on the intra-AS paths to the ASBR\/forwarding addresses, as specified in Section 16.4.1.<\/em><\/p>\n
          (d) If the new AS external path is still indistinguishable from the current paths in the N’s routing table entry, select the preferred path based on a least cost comparison.  Type 1 external paths are compared by looking at the sum of the distance to the forwarding address and the advertised type 1 metric (X+Y).  Type 2 external paths advertising equal type 2 metrics are compared by looking at the distance to the forwarding addresses.<\/em><\/p>\n
          RFC 2328, <\/em>section 16.4<\/em><\/a><\/p>\n<\/blockquote>\n
          \n
          1. Intra-area paths using non-backbone areas are always the most preferred.
          2. The other paths, intra-area backbone paths and inter-area paths, are of equal preference.<\/em><\/p>\n
          RFC 2328, <\/em>section 16.4.1<\/em><\/a><\/p>\n<\/blockquote>\n
          \u0412\u043c\u0435\u0441\u0442\u043e \u043f\u0440\u044f\u043c\u043e\u0433\u043e \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u044f \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0443 \u043e\u0431\u043e\u0431\u0449\u0438\u0442\u044c \u0441\u0443\u0442\u044c \u0440\u0430\u0437\u043b\u0438\u0447\u0438\u0439:  <\/p>\n
            \n
          1. \n
            RFC 1583 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u044b \u043e\u0442 \u0440\u0430\u0437\u043d\u044b\u0445 ASBR \u0441\u0443\u0433\u0443\u0431\u043e \u043f\u043e \u043c\u0435\u0442\u0440\u0438\u043a\u0435.<\/p>\n<\/li>\n
          2. \n
            RFC 2328, \u0432 \u0441\u0432\u043e\u044e \u043e\u0447\u0435\u0440\u0435\u0434\u044c, \u043e\u0442\u0434\u0430\u0451\u0442 \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0435\u043d\u0438\u0435 ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u043c\u0441\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u0442\u043e\u0439 \u0436\u0435 \u043d\u0435\u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b; \u0435\u0441\u043b\u0438 \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432\u044b\u0431\u043e\u0440 \u0432\u0441\u0451 \u0435\u0449\u0451 \u043d\u0435 \u0443\u0434\u0430\u043b\u043e\u0441\u044c, \u0442\u043e\u0433\u0434\u0430 OSPF \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0434\u043e ASBR \u0442\u0430\u043a \u0436\u0435, \u043a\u0430\u043a \u0438 RFC 1583.<\/p>\n<\/li>\n<\/ol>\n
            \u041f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043d\u0430\u0441 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0443\u044e\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430:<\/p>\n
              \n
            1. \n
              \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442 ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0445\u0441\u044f \u0432 \u0442\u043e\u0439 \u0436\u0435 \u043d\u0435\u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u0435;<\/p>\n<\/li>\n
            2. \n
              \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e ASBR, \u043d\u0430\u0445\u043e\u0434\u044f\u0448\u0438\u0445\u0441\u044f \u0432 \u0437\u043e\u043d\u0435 0, \u0438 ASBR \u0438\u0437 \u0434\u0440\u0443\u0433\u0438\u0445 \u0437\u043e\u043d.<\/p>\n<\/li>\n<\/ol>\n
              \u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439:<\/p>\n
              <\/figcaption><\/figure>\n
              ASBR \u043e\u0431\u043c\u0435\u043d\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u043c\u0438 \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u0430\u043c\u0438 \u0441 \u0443\u0437\u043b\u043e\u043c BGP: \u043f\u043e\u043b\u0443\u0447\u0430\u044e\u0442 1.1.1.1\/32 \u0438 \u0430\u043d\u043e\u043d\u0441\u0438\u0440\u0443\u044e\u0442 3.3.3.3\/32. \u041f\u043e\u043c\u0438\u043c\u043e \u044d\u0442\u043e\u0433\u043e, ASBR \u043e\u0431\u044a\u044f\u0432\u043b\u044f\u044e\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 OSPF \u0434\u043e\u043c\u0435\u043d. \u0414\u0432\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438\u043c\u0435\u044e\u0442 \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0439 \u0432\u0435\u0441, \u0438\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043e\u0442\u043c\u0435\u0447\u0435\u043d\u044b \u043a\u0440\u0430\u0441\u043d\u044b\u043c \u0446\u0432\u0435\u0442\u043e\u043c. \u041e\u0441\u0442\u0430\u043b\u044c\u043d\u0430\u044f \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 \u043d\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0430, \u0432\u0441\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u2013 \u0442\u043e\u043b\u044c\u043a\u043e \u043b\u043e\u0432\u043a\u043e\u0441\u0442\u044c \u0440\u0443\u043a \u0438 \u043d\u0438\u043a\u0430\u043a\u043e\u0439 \u043c\u0430\u0433\u0438\u0438.<\/p>\n
              BGP#sho run | section interface|router interface Loopback0  ip address 1.1.1.1 255.255.255.255 interface FastEthernet0\/0  ip address 192.168.16.1 255.255.255.0 interface FastEthernet0\/1  ip address 192.168.12.1 255.255.255.0 router bgp 1  no bgp default ipv4-unicast  neighbor 192.168.12.2 remote-as 100  neighbor 192.168.16.6 remote-as 100  !  address-family ipv4   network 1.1.1.1 mask 255.255.255.255   neighbor 192.168.12.2 activate   neighbor 192.168.16.6 activate<\/code><\/pre>\n
              ASBR1#sho run | s interface|router interface Loopback0  ip address 2.2.2.2 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.23.2 255.255.255.0  ip ospf 1 area 0  ip ospf cost 10 interface FastEthernet0\/1  ip address 192.168.12.2 255.255.255.0 router ospf 1  default-information originate always router bgp 100  no bgp default ipv4-unicast  neighbor 192.168.12.1 remote-as 1  !  address-family ipv4   network 3.3.3.3 mask 255.255.255.255   neighbor 192.168.12.1 activate<\/code><\/pre>\n
              ASBR2#sho run | section interface|router interface Loopback0  ip address 6.6.6.6 255.255.255.255  ip ospf 1 area 1 interface FastEthernet0\/0  ip address 192.168.16.6 255.255.255.0 interface FastEthernet0\/1  ip address 192.168.56.6 255.255.255.0  ip ospf 1 area 1 interface FastEthernet1\/0  ip address 192.168.46.6 255.255.255.0  ip ospf 1 area 1  ip ospf cost 100 router ospf 1  default-information originate always router bgp 100  no bgp default ipv4-unicast  neighbor 192.168.16.1 remote-as 1  !  address-family ipv4   network 3.3.3.3 mask 255.255.255.255   neighbor 192.168.16.1 activate<\/code><\/pre>\n
              ABR1#sho run | section interface|router interface Loopback0  ip address 4.4.4.4 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.45.4 255.255.255.0  ip ospf 1 area 0 interface FastEthernet0\/1  ip address 192.168.34.4 255.255.255.0  ip ospf 1 area 0 interface FastEthernet1\/0  ip address 192.168.46.4 255.255.255.0  ip ospf 1 area 1  ip ospf cost 100 router ospf 1<\/code><\/pre>\n
              ABR2#sho run | section interface|router interface Loopback0  ip address 5.5.5.5 255.255.255.255  ip ospf 1 area 0 interface FastEthernet0\/0  ip address 192.168.45.5 255.255.255.0  ip ospf 1 area 0 interface FastEthernet0\/1  ip address 192.168.56.5 255.255.255.0  ip ospf 1 area 1 router ospf 1<\/code><\/pre>\n
              R#sho run | section interface|router interface Loopback0  ip address 3.3.3.3 255.255.255.255 interface FastEthernet0\/0  ip address 192.168.23.3 255.255.255.0  ip ospf cost 10 interface FastEthernet0\/1  ip address 192.168.34.3 255.255.255.0 router ospf 1  network 0.0.0.0 255.255.255.255 area 0<\/code><\/pre>\n
              \u041c\u043e\u0436\u0435\u0442 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u044c\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u0438 \u0442\u0430\u043a\u043e\u0439 \u043d\u0435\u0432\u0438\u043d\u043d\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0435 \u0443\u0437\u0435\u043b BGP \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c \u0441\u0432\u044f\u0437\u043d\u043e\u0441\u0442\u044c \u0434\u043e 3.3.3.3\/32, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c 1.1.1.1\/32 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430 \u0430\u0434\u0440\u0435\u0441\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0430.<\/p>\n
              BGP#ping 3.3.3.3 so lo 0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1  ..... Success rate is 0 percent (0\/5)<\/code><\/pre>\n
              \u0427\u0442\u043e, \u0432\u043f\u0440\u043e\u0447\u0435\u043c, \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u043d\u0435 \u043c\u0435\u0448\u0430\u0435\u0442 \u0441\u0435\u0442\u0438 \u0434\u043e\u0431\u0440\u043e\u0441\u043e\u0432\u0435\u0441\u0442\u043d\u043e \u0442\u0435\u0440\u044f\u0442\u044c \u0442\u0440\u0430\u0444\u0438\u043a. \u041c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c, \u0433\u0434\u0435-\u0442\u043e \u043f\u043e \u043f\u0443\u0442\u0438 \u043d\u0435 \u0445\u0432\u0430\u0442\u0430\u0435\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u043e\u0432?<\/p>\n
              BGP#traceroute 3.3.3.3 source 1.1.1.1 Type escape sequence to abort. Tracing the route to 3.3.3.3 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.16.6 12 msec 24 msec 20 msec   2 192.168.56.5 56 msec 16 msec 36 msec   3  *  *  *  <output omitted><\/code><\/pre>\n
              \u041f\u043e\u0445\u043e\u0436\u0435 \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e ABR1 \u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u0442 \u043f\u0440\u0438\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u043a \u043d\u0435\u043c\u0443 \u043f\u0430\u043a\u0435\u0442\u044b. \u041e\u0434\u043d\u0430\u043a\u043e \u043f\u0435\u0440\u0432\u043e\u0435 \u0432\u043f\u0435\u0447\u0430\u0442\u043b\u0435\u043d\u0438\u0435 \u043e\u0431\u043c\u0430\u043d\u0447\u0438\u0432\u043e, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0435\u0441\u043b\u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c traceroute \u0441 \u0434\u0440\u0443\u0433\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b:<\/p>\n
              R#traceroute 1.1.1.1 source 3.3.3.3 Type escape sequence to abort. Tracing the route to 1.1.1.1 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.34.4 16 msec 16 msec 20 msec   2 192.168.34.3 20 msec 24 msec 16 msec   3 192.168.34.4 32 msec 36 msec 40 msec   4 192.168.34.3 36 msec 40 msec 36 msec <\u043d\u0443 \u0432\u044b \u043f\u043e\u043d\u044f\u043b\u0438><\/code><\/pre>\n
              <\/figcaption><\/figure>\n
              \u0415\u0441\u043b\u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0430 \u0441\u0445\u0435\u043c\u0443, \u0442\u043e \u0432\u044b\u0431\u043e\u0440 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 \u0441\u0442\u043e\u0440\u043e\u043d\u0443 ASBR2 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u043c R \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0440\u0430\u0437\u0443\u043c\u043d\u044b\u043c:  <\/p>\n
              R#sho ip ospf border-routers                  OSPF Router with ID (3.3.3.3) (Process ID 1)   Base Topology (MTID 0)  Internal Router Routing Table Codes: i - Intra-area route, I - Inter-area route  i 4.4.4.4 [1] via 192.168.34.4, FastEthernet0\/1, ABR, Area 0, SPF 12 i 5.5.5.5 [2] via 192.168.34.4, FastEthernet0\/1, ABR, Area 0, SPF 12 i 2.2.2.2 [10] via 192.168.23.2, FastEthernet0\/0, ASBR, Area 0, SPF 12 I 6.6.6.6 [3] via 192.168.34.4, FastEthernet0\/1, ASBR, Area 0, SPF 12 I 6.6.6.6 [101] via 192.168.34.4, FastEthernet0\/1, ASBR, Area 0, SPF 12<\/code><\/pre>\n
              \u0410 \u0432\u043e\u0442 ABR1 \u0432\u0435\u0434\u0451\u0442 \u0441\u0435\u0431\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0442\u0440\u0430\u043d\u043d\u043e, \u043f\u043e \u043a\u0440\u0430\u0439\u043d\u0435\u0439 \u043c\u0435\u0440\u0435 \u043d\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u0437\u0433\u043b\u044f\u0434:<\/p>\n
              ABR1#sho ip ospf border-routers               OSPF Router with ID (4.4.4.4) (Process ID 1)   Base Topology (MTID 0)  Internal Router Routing Table Codes: i - Intra-area route, I - Inter-area route  i 5.5.5.5 [101] via 192.168.46.6, FastEthernet1\/0, ABR, Area 1, SPF 8 i 5.5.5.5 [1] via 192.168.45.5, FastEthernet0\/0, ABR, Area 0, SPF 9 i 2.2.2.2 [11] via 192.168.34.3, FastEthernet0\/1, ASBR, Area 0, SPF 9 i 6.6.6.6 [100] via 192.168.46.6, FastEthernet1\/0, ASBR, Area 1, SPF 8<\/code><\/pre>\n
              \u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u043f\u0440\u0438\u0441\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043c\u0435\u0442\u0440\u0438\u043a\u0438 \u0434\u043e ASBR2 \u0441 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u043e\u0431\u043e\u0438\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432. R \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u0442 \u043f\u0443\u0442\u044c \u0447\u0435\u0440\u0435\u0437 ABR2 \u0441 \u0432\u0435\u0441\u043e\u043c, \u0440\u0430\u0432\u043d\u044b\u043c 3; \u0432 \u0441\u0432\u043e\u044e \u043e\u0447\u0435\u0440\u0435\u0434\u044c, ABR1 \u043d\u0435 \u0438\u043c\u0435\u0435\u0442 \u043d\u0438 \u043c\u0430\u043b\u0435\u0439\u0448\u0435\u0433\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0435 \u0447\u0435\u0440\u0435\u0437 ABR2 \u0438 \u0432\u0438\u0434\u0438\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0443\u0442\u044c \u0441 \u0432\u0435\u0441\u043e\u043c, \u0440\u0430\u0432\u043d\u044b\u043c 101. \u041f\u0440\u0438\u0447\u0438\u043d\u0430 \u0442\u0430\u043a\u043e\u0433\u043e \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0437\u0430\u0438\u0447\u043d\u0430: ASBR2 \u0438 ABR1 \u043d\u0430\u0445\u043e\u0434\u044f\u0442\u0441\u044f \u0432 \u043e\u0434\u043d\u043e\u0439 \u0437\u043e\u043d\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 ABR1 \u043e\u0431\u044f\u0437\u0430\u043d \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043d\u0443\u0442\u0440\u0438\u0437\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0440\u0448\u0440\u0443\u0442. \u041a\u0430\u043a \u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435, \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c ASBR \u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0439 \u0440\u0430\u0437 \u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e \u043f\u0443\u0442\u0438 \u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430, \u0447\u0442\u043e \u0438 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0435\u0442\u043b\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0438.<\/p>\n
              \u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0438\u043c \u0432\u0441\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u044b \u0434\u043e\u043c\u0435\u043d\u0430 \u0432 \u0440\u0435\u0436\u0438\u043c \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438 \u0441 RFC 2328:<\/p>\n
              R(config)#router ospf 1 R(config-router)#no compatible rfc1583<\/code><\/pre>\n
              R#traceroute 1.1.1.1 so 3.3.3.3 Type escape sequence to abort. Tracing the route to 1.1.1.1 VRF info: (vrf in name\/id, vrf out name\/id)   1 192.168.34.4 20 msec 32 msec 12 msec   2 192.168.46.6 12 msec 20 msec 8 msec   3 192.168.16.1 4 msec 28 msec 16 msec<\/code><\/pre>\n
              ABR1#sho ip ro os                               <output omitted> Gateway of last resort is 192.168.46.6 to network 0.0.0.0  O*E2  0.0.0.0\/0 [110\/1] via 192.168.46.6, 00:02:00, FastEthernet0\/1 <output omitted><\/code><\/pre>\n
              \u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u043d\u0430\u043c \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u043f\u043e\u0431\u043e\u0440\u043e\u0442\u044c \u043f\u0435\u0442\u043b\u044e, \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u044f \u0441\u0442\u0430\u043b\u0430 \u043d\u0435\u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0439. R \u0441\u0447\u0438\u0442\u0430\u0435\u0442 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u044b \u0434\u043e ASBR1 (\u0432\u043d\u0443\u0442\u0440\u0438 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b) \u0438 ASBR2 (\u043c\u0435\u0436\u0437\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439) \u0440\u0430\u0432\u043d\u043e\u0446\u0435\u043d\u043d\u044b\u043c\u0438, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u0438\u0445 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e \u043c\u0435\u0442\u0440\u0438\u043a\u0435. \u041d\u0435 \u043b\u0443\u0447\u0448\u0435 \u043b\u0438 \u0431\u044b\u043b\u043e \u043e\u0442\u0434\u0430\u0442\u044c \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0435\u043d\u0438\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0443 \u0432\u043d\u0443\u0442\u0440\u0438 \u043e\u043f\u043e\u0440\u043d\u043e\u0439 \u0437\u043e\u043d\u044b? \u0418\u043c\u0435\u043d\u043d\u043e \u0442\u0430\u043a \u0438 \u0434\u0443\u043c\u0430\u043b\u0438 \u0430\u0432\u0442\u043e\u0440\u044b RFC 2178:<\/p>\n
              \n
              1. Intra-area paths using non-backbone areas are always the most preferred.
              2. Otherwise, intra-area backbone paths are preferred.
              3. Inter-area paths are the least preferred.<\/em><\/p>\n
              RFC 2178, <\/em>section 16.4.1<\/em><\/a><\/p>\n<\/blockquote>\n
              \u0412\u043f\u0440\u043e\u0447\u0435\u043c, \u043d\u0430\u0448\u043b\u0430\u0441\u044c \u0432\u0435\u0441\u043e\u043c\u0430\u044f \u043f\u0440\u0438\u0447\u0438\u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0432\u044b\u0431\u043e\u0440\u0430 \u043b\u0443\u0447\u0448\u0435\u0433\u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0430:<\/p>\n
              \n
              There is still the possibility of a<\/em><\/p>\n<\/blockquote>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-343058","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/343058","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=343058"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/343058\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=343058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=343058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=343058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}