Tuesday, June 22, 2021

Unexpected Interactions Between OSPF and BGP

It started with an interesting question tweeted by @pilgrimdave81

I’ve seen on Cisco NX-OS that it’s preferring a (ospf->bgp) locally redistributed route over a learned EBGP route, until/unless you clear the route, then it correctly prefers the learned BGP one. Seems to be just ooo but don’t remember this being an issue?

Ignoring the “why would you get the same route over OSPF and EBGP, and why would you redistribute an alternate copy of a route you’re getting over EBGP into BGP” aspect, Peter PalĂșch wrote a detailed explanation of what’s going on and allowed me to copy into a blog post to make it more permanent:



source https://blog.ipspace.net/2021/06/interactions-ospf-bgp.html?utm_source=atom_feed

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