[c-nsp] Preferring OSPF over BGP

sthaug at nethelp.no sthaug at nethelp.no
Fri Aug 13 19:07:46 EDT 2010

> The problem in short: there is a pretty big network with many routers, 
> Cisco only. One of them has a network connected which it redistributes 
> to OSPF. All other routers see the route via OSPF and via eBGP. Because 
> of default administrative distance values, eBGP route always wins, so 
> the traffic to that network from all routers but the one connected, 
> always chooses external carriers, not the internal network.
> One of the solutions is to change globally administrative distance for 
> OSPF or BGP. However it is pretty dangerous to do it for all the routes 
> on the core routers and Cisco even advices:

Well now. Cisco has for many years recommended having the *same*
administrative distance for iBGP and eBGP, as in 

distance bgp 200 200 200

Wouldn't this accomplish what you need?

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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