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Старая версия 6

changes.mady.by.user Костенко Дмитрий Викторович

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changes.mady.by.user Костенко Дмитрий Викторович

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При данной конфигурации устройства R1, R2 и R3 относятся к NULL-домену. Полученные VPNv4-маршруты с типами 0x01, 0x02 и 0x03 обрабатываются как Inter-Area маршруты.

R6# show route ospf
Блок кода
title
0/ME5200S:
0/ME5200S:R3# show  bgp  vpnv4 unicast  rd  172.27.72.228:65100 172.27.72.229/32
Tue Aug 25 22:57:50 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.27.72.229/32
    Path #0
    AS path: 
    RD 172.27.72.228:65100, 172.27.72.228 from 172.27.72.228 (172.27.72.228), Source VRF: shamospf
      Received/Local Label: 16/50
      Origin incomplete, metric 3, local-pref 100, weight 0, not-tracked, internal, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-router-id 172.20.25.7, ospf-route-type area: 0.0.0.0, route-type: 0x2, metric-type: n/a
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1

0/ME5200S:R3# show  bgp  vpnv4 unicast  rd  172.27.72.226:65100 172.27.72.227/32
Tue Aug 25 22:58:01 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.27.72.227/32
    Path #0
    AS path: 
    RD 172.27.72.226:65100, 172.27.72.226 from 172.27.72.228 (172.27.72.228), Source VRF: shamospf
      Received/Local Label: 40/74
      Origin incomplete, metric 3, local-pref 100, weight 0, not-tracked, internal, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-router-id 172.20.25.9, ospf-route-type area: 0.0.0.1, route-type: 0x2, metric-type: n/a
      Cluster List: 172.27.72.228
      Originator ID: 172.27.72.226
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1



0/ME5200S:R6#show  route ospf 
Wed Aug 26 08:35:52 2026
  Codes: IA - OSPF inter area, EA - OSPF intra area
      N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
      E1 - OSPF external type 1, E2 - OSPF external type 2
  
  O IA   172.27.72.227/32    via 172.28.71.21 [30/1], 00h00m44s, te0/0/2
  O IA   172.27.72.229/32    via 172.28.71.21 [30/1], 03h29m23s, te0/0/2

Далее отнесем R3 и R1 к одному OSPF domain-id и проверим как изменится тип маршрутов для 172.27.72.227, 172.27.72.134 и 172.27.72.229 на R6

title
Блок кода
show runnung router ospfv2
0/ME5200S:R3#show  running-config  router ospfv2
router ospfv2 0
  vrf ospf
    area 0.0.0.1
      interface tengigabitethernet 0/0/3
        bfd fast-detect
        network point-to-point
      exit
    exit
    domain-id type-0005 value 000000000001  <<< данной командой  мы добавляем атрибут ospf-domain к VPNv4 маршрутам
    redistribution bgp ospf
    exit
  exit
exit

0/ME5200S:R1#show  running-config  router ospfv2
router ospfv2 0
  vrf ospf
    area 0.0.0.1
      interface tengigabitethernet 0/0/1
        bfd fast-detect
        network point-to-point
      exit
    exit
    domain-id type-0005 value 000000000001  <<< данной командой  мы добавляем атрибут ospf-domain к VPNv4 маршрутам
    redistribution bgp ospf
    exit
  exit
exit
Блок кода
titleshow runnung router ospfv2
0/ME5200S:R3# show  bgp  vpnv4 unicast  rd  172.27.72.226:65100 172.27.72.227/32
Tue Aug 25 21:32:00 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.27.72.227/32
    Path #0
    AS path: 
    RD 172.27.72.226:65100, 172.27.72.226 from 172.27.72.228 (172.27.72.228), Source VRF: ospf
    Received/Local Label: 40/74
      Origin incomplete, metric 3, local-pref 100, weight 0, not-tracked, internal, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-domain 0x5:0x000000000001 <<, ospf-route-type area: 0.0.0.1, route-type: 0x2, metric-type: n/a, ospf-router-id 172.20.25.9
      Cluster List: 172.27.72.228
      Originator ID: 172.27.72.226
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1
0/ME5200S:R3# show  bgp  vpnv4 unicast  rd  172.27.72.228:65100 172.27.72.229/32
Tue Aug 25 21:32:03 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.27.72.229/32
    Path #0
    AS path: 
    RD 172.27.72.228:65100, 172.27.72.228 from 172.27.72.228 (172.27.72.228), Source VRF: ospf
    Received/Local Label: 16/50
      Origin incomplete, metric 3, local-pref 100, weight 0, not-tracked, internal, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-router-id 172.27.72.228, ospf-route-type area: 0.0.0.0, route-type: 0x2, metric-type: n/a
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1

Мы видим, что к VPNv4 маршруту 172.27.72.227/32 добавился ospf-domain атрибут, тогда как у 172.27.72.229/32 его нет. Проверим как это сказалось на обработке маршрута на R4

0/ME5200S:R6# show  route ospf 
Wed Aug 26 09:30:51 2026
  Codes: IA - OSPF inter area, EA - OSPF intra area
      N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
      E1 - OSPF external type 1, E2 - OSPF external type 2
  

  O IA   172.27.72.227/32    via 172.28.71.21 [30/1], 00h55m43s, te0/0/2 <<< При совпадении ospf-domain маршрут установился как inter-area
  O E2   172.27.72.229/32    via 172.28.71.21 [110/0], 00h50m35s, te0/0/2 <<< При несовпадении ospf-domain маршрут установился как AS-External

...

Блок кода
titleСравнение атрибутов Route Type Extended Community
0/ME5200S:R3# show  bgp  vpnv4 unicast  rd 172.27.72.230:65100   172.27.76.134/32
Tue Aug 25 22:43:21 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.27.76.134/32
    Path #0
    AS path: 
    RD 172.27.72.230:65100 (172.27.72.230), Source VRF: ospf
    Received/Local Label: -/21
      Origin incomplete, metric 3, local-pref 100, weight 32768, not-tracked, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-domain 0x5:0x000000000001, ospf-route-type area: 0.0.0.1, route-type: 0x2, metric-type: n/a, ospf-router-id 172.20.25.5
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1

Route Type Extended Community заполнились следующим образом:
1) ospf-route-type area: 0.0.0.1
2) route-type: 0x2, что соответствует intra-area маршруту
3) metric-type: n/a, так как маршрут intra-area

OSPF Router ID Extended Community соответствует 172.20.25.5 - маршрутизатору сгенерировавшему данный маршрут

0/ME5200S:US-STN-ILCH-PE11# show  bgp  vpnv4 unicast rd  172.27.72.230:65100 172.28.71.22/32 <<< маршрут полученный путем редистрибуции на R6 из таблицы local в ospf:
Tue Aug 25 22:43:16 2026
  BGP router identifier 172.27.72.230, local AS number 65100 
  BGP routing table entry for 172.28.71.22/32
    Path #0
    AS path: 
    RD 172.27.72.230:65100 (172.27.72.230), Source VRF: ospf
    Received/Local Label: -/21
      Origin incomplete, metric 1, local-pref 100, weight 32768, not-tracked, best
      Address family: ipv4/vpn
      NLRI pathID: 0
      Aggregator AS: 0, Address: 0.0.0.0, Atomic aggregate: absent
      Extended Community: RT 65100:123 (0.0.0.123), ospf-domain 0x5:0x000000000001, ospf-route-type area: 0.0.0.0, route-type: 0x5, metric-type: E2, ospf-router-id 172.20.25.5
      Is not stale, is not history
      Route flap penalty: 0, flap count 0, is not suppressed
      Route flap time left: 00:00:00, time start: never
      Route is not ECMP

    Total entries: 1

Route Type Extended Community заполнились следующим образом:
1) ospf-route-type area: 0.0.0.0
2) route-type: 0x5, что соответствует AS-External маршруту
3) metric-type: E2

OSPF Router ID Extended Community соответствует 172.20.25.5 - маршрутизатору сгенерировавшему данный маршрут

...