-----Original Message----- From: Robert Raszuk [mailto:[email protected]] Sent: Wednesday, April 08, 2009 11:12 AM To: UTTARO, JAMES, ATTLABS Cc: [email protected] Subject: Re: [GROW] BGP Monitoring Protocol
Hi Jim, > I was a bit confused about the "L3VPN Instance Peer". What does it > mean to set the Peer Distinguisher to the Route Distinguisher of the > L3VPN instance that the peer belongs to? EBGP session you are monitoring will belong to either global table or some VRF on a given PE. Adding RD makes it easier to find out which VRF given routes belong. If the session is to the global table the field will be zero. > Are you assuming that the RD is different for every instantiation of > the VPN on each PE? It is possible that the same RD is used across all > PEs that a VPN belongs to. >>There is no need to make such assumption. The addition of the RD should >>be used at the management station along with Peer BGP ID which would >>then used in tuple identify PE/VRF for a given session. Peer BGP ID is >>already part of BMP header. My thinking is that the management station cannot use the RD as the method to uniquely identify a VPN/VRF across all PEs. For VPNA Each PE participating in VPNA may use a unique RD. This method is quite useful for convergence, and load balancing. If ISPs can configure RDs as unique per VPN per PE per VRF or common then how can RD make it easier to determine eBGP sessions belonging to a specific VPN. I agree that it will identify per VRF but is this useful without the VPN context? Cheers, R. > "o Peer Distinguisher (8 bytes): Routers today can have multiple > instances (example L3VPNs). This field is present to distinguish > peers that belong to one address domain from the other. > > If the peer is a "Global Instance Peer", this field is zero > filled. If the peer is a "L3VPN Instance Peer", it is set to the > route distinguisher of the particular L3VPN instance that the peer > belongs to." > > I was a bit confused about the "L3VPN Instance Peer". What does it mean > to set the Peer Distinguisher to the Route Distinguisher of the L3VPN > instance that the peer belongs to? Are you assuming that the RD is > different for every instantiation of the VPN on each PE? It is possible > that the same RD is used across all PEs that a VPN belongs to. > > Jim Uttaro > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > GROW mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/grow _______________________________________________ GROW mailing list [email protected] https://www.ietf.org/mailman/listinfo/grow
