I have 3 routers sitting on the same lan sharing the same subnet. Router A and B participate in HSRP and connect to the company network with visibility of the full IP network but Router C is attached to an external network. I do not want routes from Router A and B to propogate to Router C but I do want visibility of subnet physically connected to Router C.
You can use a outbound filter on A and Bs interface which will filter the desired routes. Permit only what is wanted.
access-list 10 permit
distribute-list 10 out
If you use OSPF then, filtering using a outbound filter wont work. So what you need to do is configure inbound distribute list at C and filter necessary routes that are coming from A and B. This is because, distribute list filters work on routing tables and not on LSAs. OSPF sents routing entries as LSAs unlike, other routing protocols.
This would work fine for protocols such as RIP/IGRP. But for those protocols like EIGRP and OSPF this wont work, as it would remove the neighbor relationship also. He has not specified which routing protocol he is using.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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