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L3out with OSPF/Transit routing

Fairytale16
Level 1
Level 1

Hello all,

I really need your advise.

I have a legacy network with multiple routers connected. Most of them in the Area 0.

I have ACI multipod with 2 pods to migrate to.

What makes it tricky is:

  • 2 sites (single core switch for each) (A,B) need to be connected to both pods (Area 0)
  • MPLS (E,F) routers need to be connected to local pods (Area 0)
  • HA ASA with Redundant interfaces (Area 0)

The Idea is to deploy L3out for each of them. *(I have enough Leafs to have different L3outs for A,B,E,F).

For MPLS I will use tagging (with deny route-map) for MPLS/BGP to avoid routes advertising back to ACI.

For ASA - as we have redundant interfaces there are going to be different primary IPs but same secondary IP.

I'm a bit concerned about using 0.0.0.0/0 with Export and Aggregate across all the L3outs. I've tried 0.0.0.0/1 and 128.0.0.0/1 - it didn't work. Could you please advise is there any tricks of using these subnets instead of 0.0.0.0/0 and is there any possible issues having OSPF Area 0s across ACI.

 

Fairytale16_0-1702270408283.png

 

Kind regards,

Paul

1 Reply 1

Fairytale16
Level 1
Level 1

Solved.

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