The MPLS WG Archive

[Chris Flores <chris.flores@onfiber.com>]

Interesting, then I have the following question. Let's say the transit
backbone consists of a 3 level hierarchy - core, distribution and access.
BGP is configured such that the access (or edge) routers are route reflector
clients of the distribution routers. Furthermore, the distribution routers
are route reflector clients of the core routers. As Michel Redondo Ferrero
has stated, MPLS VPNs originate and terminate on the access or edge of the
network (in his scenario). Why would you turn off BGP on the core routers?
What if MPLS breaks or fails for any reason (i.e. software bug). Then, how
would routing occur?

Regards.

chris

-----Original Message-----
From: Javier Antich [mailto:javier.antich@telindus.es]
Sent: Thursday, September 28, 2000 11:28 AM
To: Michel Redondo Ferrero
Cc: mpls@UU.NET
Subject: RE: MPLS/BGP routing question


Core Routers do not need to run BGP because they, in practice don't take
routing decisions with user traffic (I mean traffic comming or going to
Internet), they just switch frames based on their MPLS label. BGP decissions
are made at the edge and packets sent to the BGP next hop through the
corresponding MPLS LSP.





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	-----Mensaje original-----
	De:	Michel Redondo Ferrero [SMTP:mredondo@idecnet.com]
	Enviado el:	jueves 28 de septiembre de 2000 8:26
	Para:	mpls@UU.NET
	Asunto:	MPLS/BGP routing question

	Hi,

	Considering the next scenario:

	-Core and Border routers running IS-IS, MPLS
	-VPNs configured in Border routers using BGP/MPLS
	-Border routers running BGP with full-routing

	The question:
	Do Core routers need to run BGP? Is IS-IS enough?

	Thanks in advance for your answers.

	Michel Redondo Ferrero