A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Inter AS option for BGP/MPLS IP VPN
Author(s) : M. Kulmala, et al.
Filename : draft-kulmala-l3vpn-interas-option-d-01.txt
Pages : 8
Date : 2005-10-6
This document describes an additional option to the 'Multi-AS
Backbones' section of [RFC2547]. This option combines per VPN VRFs at
the Autonomous System Border Router (ASBR) as described in 'Option a'
with EBGP redistribution of labeled VPN-IPv4 routes as described in
'Option b'.
In contrast to 'Option a' however, per VPN VRFs at the
ASBR are not associated to interfaces. Interfaces between ASBR pairs
in separate ASes use MPLS-labeled packets to forward traffic. In this
Multi-AS option, the ASBR installs VPN-IPv4 routes into VRFs. Once
installed in a VRF at the ASBR, best path selection is performed,
and selected routes are converted to VPN-IPv4 routes by the addition
of Route Target (RT) and Route Distinguisher (RD) values as
configured per VRF at the ASBR. If attached ASBR pairs belonging to
separate ASes make use of this Multi-AS option, then VRF based route
filtering policies via RTs is achieved directly between ASBR pairs,
independent of PE based RT filtering within an AS.
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