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Cell Relay Retreat>MPLS WG Archive>month:2000-Sep> msg00513



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MPLS/BGP routing question

  • From: Danny McPherson <danny@tcb.net>
  • Date: Fri, 29 Sep 2000 11:01:16 -0600


> I don't  agree.  I think that  even with respect to  public Internet routes,
> there are a  number of advantages to NOT distributing all  the routes to all
> the core  routers.  I think it  is a perfectly  valid use of MPLS  to tunnel
> packets through the core so as to avoid the need for a full IBGP mesh. 

Of course, pretty much no one has 'true' full IBGP mesh today (i.e. either RRs 
or confederations are used) and pretty much no one has MPLS-only core (today). 
 Given, there are significant advantages with disabling BGP in the core (some 
mentioned in the level3bcp draft, I believe), especially when considering 
stability.

Then again, the complexity of your pseudo full-mesh IBGP network increases 
considerably when you remove a layer of the IP hierarchy (i.e. the IP core) 
and it's now non-congruent to the underlying network topology (e.g. the BGP 
rr-considered-harmful(?) draft a while back, the new wording surrounding 
topologies in RFC 2796, etc..).

-danny