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ISIS OSPF +----+ Area 49.001 +----+ Area 0 +----+ | | | | | | | R1 +---------------+ R2 +-------------+ R3 | | | | | | | +----+ +----+ +----+ |
На R2 выполняется взаимная редистрибуция OSPF<->ISIS
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root@R2# show policy-options policy-statement PM_ISIS_TO_OSPF { from protocol isis; then accept; } policy-statement PM_OSPF_TO_ISIS { from protocol ospf; then accept; } root@R2# show protocols ospf export PM_ISIS_TO_OSPF; area 0.0.0.0 { interface ge-0/0/1.0 { interface-type p2p; } interface lo0.0 { passive; } } root@R2# show protocols isis export PM_OSPF_TO_ISIS; level 1 disable; interface ge-0/0/0.0 { point-to-point; } interface lo0.0 { point-to-point; passive; } |
На R1 есть маршрут к R3:
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root@R1> show route 3.3.3.3 inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 3.3.3.3/32 *[IS-IS/165] 00:03:30, metric 11 > to 10.0.0.2 via ge-0/0/0.0 |
Но пинг не успешен:
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root@R1> ping 3.3.3.3 count 3 wait 1 PING 3.3.3.3 (3.3.3.3): 56 data bytes --- 3.3.3.3 ping statistics --- 3 packets transmitted, 0 packets received, 100% packet loss |
Исходя из вывода выше, src у пакетов берется с интерфейса ge-0/0/0.0 :
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root@R1> show interfaces ge-0/0/0.0 terse Interface Admin Link Proto Local Remote ge-0/0/0.0 up up inet 10.0.0.1/30 iso multiservice |
Если взять src с lo0.0 то все ок,
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root@R1> ping 3.3.3.3 no-resolve wait 1 count 1 source 1.1.1.1 PING 3.3.3.3 (3.3.3.3): 56 data bytes 64 bytes from 3.3.3.3: icmp_seq=0 ttl=63 time=7.695 ms --- 3.3.3.3 ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max/stddev = 7.695/7.695/7.695/0.000 ms |
Очевидно connected сети нет в OSPF, хотя она конечно есть в topology db ISIS:
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root@R1> show isis database R2.00-00 level 2 detail IS-IS level 2 link-state database: R2.00-00 Sequence: 0x7, Checksum: 0xcfee, Lifetime: 768 secs IS neighbor: R1.00 Metric: 10 IP prefix: 2.2.2.2/32 Metric: 0 Internal Up IP prefix: 3.3.3.3/32 Metric: 1 External Up IP prefix: 10.0.0.0/30 Metric: 10 Internal Up |
На первый вгляд кажется, что R2 должен заглянуть в ISIS DB, и перелить все это в OSPF, но это конечно не так. Чтобы перелить например из ISIS в OSPF коробка ищет активные ISIS маршруты в RIB (в данном случае это inet.0) и переливает в OSPF.
Например так:
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root@R2> show route protocol isis inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 1.1.1.1/32 *[IS-IS/18] 00:33:34, metric 10 > to 10.0.0.1 via ge-0/0/0.0 |
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root@R2> show ospf database external detail OSPF AS SCOPE link state database Type ID Adv Rtr Seq Age Opt Cksum Len Extern *1.1.1.1 2.2.2.2 0x80000001 736 0x22 0xfaa1 36 mask 255.255.255.255 Topology default (ID 0) Type: 2, Metric: 10, Fwd addr: 0.0.0.0, Tag: 0.0.0.0 |
Если маршрут к 1.1.1.1/32 будет не активным в RIB, редистрибуция конечно работать не будет:
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root@R2# set routing-options static route 1.1.1.1/32 discard root@R2# commit commit complete |
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root@R2> show route 1.1.1.1 inet.0: 8 destinations, 9 routes (8 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 1.1.1.1/32 *[Static/5] 00:00:07 Discard [IS-IS/18] 00:36:09, metric 10 > to 10.0.0.1 via ge-0/0/0.0 |
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root@R2> show ospf database external detail root@R2> |
Как решение можно перелить direct в OSPF (генерируется TYPE5 LSA),
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root@R2# show policy-options policy-statement PM_ISIS_TO_OSPF term ISIS { from protocol isis; then accept; } term DIRECT { from { protocol direct; interface ge-0/0/0.0; } then accept; } |
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root@R2> show ospf database external OSPF AS SCOPE link state database Type ID Adv Rtr Seq Age Opt Cksum Len Extern *1.1.1.1 2.2.2.2 0x80000001 405 0x22 0xfaa1 36 Extern *10.0.0.0 2.2.2.2 0x80000001 92 0x22 0x3073 36 |
Или включить OSPF как passive на данном линке:
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root@R2# set protocols ospf area 0 interface ge-0/0/0.0 passive [edit] root@R2# commit commit complete |
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root@R2> show ospf database router advertising-router self detail OSPF database, Area 0.0.0.0 Type ID Adv Rtr Seq Age Opt Cksum Len Router *2.2.2.2 2.2.2.2 0x80000005 106 0x22 0xa517 72 bits 0x2, link count 4 id 10.0.0.0, data 255.255.255.252, Type Stub (3) Topology count: 0, Default metric: 1 id 3.3.3.3, data 10.0.1.1, Type PointToPoint (1) Topology count: 0, Default metric: 1 id 10.0.1.0, data 255.255.255.252, Type Stub (3) Topology count: 0, Default metric: 1 id 2.2.2.2, data 255.255.255.255, Type Stub (3) Topology count: 0, Default metric: 0 Topology default (ID 0) Type: PointToPoint, Node ID: 3.3.3.3 Metric: 1, Bidirectional |
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root@R1> ping 3.3.3.3 no-resolve wait 1 count 1 PING 3.3.3.3 (3.3.3.3): 56 data bytes 64 bytes from 3.3.3.3: icmp_seq=0 ttl=63 time=62.106 ms --- 3.3.3.3 ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max/stddev = 62.106/62.106/62.106/0.000 ms |