[c-nsp] eBGP --> OSPF --> eBGP vs eBGP --> iBGP --> eBGP

sthaug at nethelp.no sthaug at nethelp.no
Sat May 9 09:14:24 EDT 2009

> Something I hadn't expected was that many suggested that OSPF only be used 
> to propagate infrastructure routes throughout our backbone, and that iBGP be 
> used for all other (i.e. customer) routes. A link describing this best 
> practice was offered: 

Yes, this is standard practice, at least for larger ISPs. Your IGP (OSPF
or IS-IS) carries links and loopbacks, BGP basically carries everything

Also, some ISPs choose to exclude links from the IGP, using it to carry
loopbacks only. In such a configuration, the links are in BGP.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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