I can see all the external ospf routes are refreshing, but not inter area routes. Can you please tell me why?

[Subhasish Karmakar]

I can see all the external ospf routes are refreshing, but not inter area routes. Can you please tell me why?

[Subhasish Karmakar]

Example:

Routing entry for 66.129.191.32/29

  Known via "ospf 65040", distance 110, metric 253, type inter area

  Advertised by bgp 65040

  Last update from 10.143.240.30 on GigabitEthernet0/2, 2d05h ago

Routing entry for 66.129.191.48/29

  Known via "ospf 65040", distance 110, metric 1

  Tag 18101, type extern 2, forward metric 2

  Advertised by bgp 65040

  Last update from 10.143.240.34 on GigabitEthernet0/3, 00:00:15 ago

[Giuseppe Larosa]

Hello Subhasish,

check on ASBR router

10.143.240.34

the inter-area routes are generated by ABR routers between OSPF areas

external routes are originated by the advertising ASBR that performs the route injection in the OSPF domain

They are not the same.

As written before you should reach the ASBR to understand why the external routes have changed state in recent time.

Hope to help

Giuseppe

[Subhasish Karmakar]

Thanks for the reply. Here 10.143.240.34 is not the ASBR. The ASBR is connected via 10.143.240.34. In both routers routes are stable.

in 10.143.240.34 device:

Routing entry for 66.129.191.48/29

  Known via "ospf 65040", distance 110, metric 1

  Tag 18101, type extern 2, forward metric 1

  Last update from 10.143.253.118 on GigabitEthernet0/0/3, 1w0d ago

  Routing Descriptor Blocks:

  * 10.143.253.118, from 10.143.247.10, 1w0d ago, via GigabitEthernet0/0/3

      Route metric is 1, traffic share count is 1

      Route tag 18101

in ASBR:

Routing entry for 66.129.191.48/29

  Known via "bgp 65200", distance 20, metric 0

  Tag 18101, type external

  Redistributing via ospf 65201

  Advertised by ospf 65201 subnets route-map BGP-2-OSPF

  Last update from 10.143.252.1 1w0d ago

  Routing Descriptor Blocks:

  * 10.143.252.1, from 10.143.252.1, 1w0d ago

      Route metric is 0, traffic share count is 1

      AS Hops 2

      Route tag 18101

      MPLS label: none