Subject: RE: Question on draft-ietf-ppvpn-mpls-vpn-mib-04.txt

From: "Fang, Luyuan, ALCNS" <[email-masked]>
Date: Thu, 3 Oct 2002 14:04:13 -0400

If a single physical interface is configured with multiple logical interfaces, then each logical interface can associate with a separate VRF.

 Luyuan Fang
 AT&T - IP Network Architecture and Routing Planning 
 Middletown, NJ 07748
 732-420-1921
 [email-masked] 

-----Original Message-----
From: Wenjing Chu [mailto:[email-masked]]
Sent: Thursday, September 12, 2002 6:10 PM
To: [email-masked]
Subject: Question on draft-ietf-ppvpn-mpls-vpn-mib-04.txt

Tom et al,

I have a separate question on the relationship among VRF, VPN, and interfaces.
The document clearly says that:

a) VRF is an instance of a VPN on a device, and the whole collection is the VPN
b) A VRF can have multiple interfaces associated

The question is then, can an interface have multiple associated VRFs, for its membership in multiple VPNs? 

Or, as some may say:
An interface's VRF contains all the information from all the VPNs that the interface is a member of. (which would conflict with (a).)

Can you clarify? Thanks.

Regards
Wenjing