Different behavior on BGP announcement between cisco and

From: jongsoo.kim@intelsat.com
Date: Tue Jul 27 2004 - 17:08:24 GMT-3

I found some different behavior between cisco and Juniper when a BGP route accidently announced via OPSF. Basically, Juniper stop announcing route via BGP while cisco seems to announce BGP and OSPF. I am using cisco as access and juniper as core.

I need validation on the below statment, which was my conclusion on this problem.

It seems that Cisco announce BGP routes to iBGP peer as long as it shows in BGP table( show ip bgp) as "eligible" route, regardless of appearance on routing table. It means if the router learns the same route via OSPF, it will still announce the route via BGP.

But Juniper only announces BGP routes to iBGP peer only which show as active route(best route) in the local forwarding table. It means if the router learns the same route via OSPF, it will not announce the route via BGP as the route in forwarding table only shows as OSPF active route not BGP.

Thanks

Jongsoo

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