OSPF - default-information - routing loop when interlink failed
I'm trying to understand a routing loop scenario on our core router which is running OSPF & BGP. We had a issue that the subnets behind these 2 core router was not reachable after the internlink connection between the two CORE router failed.
router ospf 1
no passive-interface GigabitEthernet0/1 (Connecting to Dist A)
no passive-interface GigabitEthernet0/2 (Connecting to Dist B)
no passive-interface GigabitEthernet0/3 (Interlink between WAN A&B)
Re: OSPF - default-information - routing loop when interlink fai
I was finding out internally how the black hole scenario was created. I agree its due to the 'always' keywod which is forcing the default route and creating routing loop for the BGP routes to which it doesnt have any routes from WAN B. It is sending the traffic back to Dist A or B which are not BGP aware and sending back to WAN B, making routing loop inevitable.
We choose to leave the config with always keyword and provide more resiliency between the routers (getting additional connectivity).
Thanks anyway for making me comfortable with your clarification.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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