A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Layer 3 Virtual Private Networks Working Group
of the IETF.
Title : Using BGP as an Auto-Discovery Mechanism for
Layer-3 and Layer-2 VPNs
Author(s) : H. Ould-Brahim, et al.
Filename : draft-ietf-l3vpn-bgpvpn-auto-06.txt
Pages : 15
Date : 2005-6-28
In any Layer-3 and Layer-2 VPN scheme, the Provider Edge (PE)
devices attached to a common VPN must exchange certain information
as a prerequisite to establish VPN-specific connectivity. The main
purpose of an auto-discovery mechanism is to enable a PE to
dynamically discover the set of remote PEs having VPN members in
common. The auto-discovery mechanism proceeds by having a PE
advertises to other PEs, at a minimum, its own IP address and the
list of VPN members configured on that PE. Once that information is
received the remote PEs will then identify the list of VPN members
they have in common with the advertising PE, and use the information
carried within the discovery mechanism to either establish layer-2/3
VPN connectivity or to learn remote site VPN routes. This draft
defines a BGP based auto-discovery mechanism for layer-2 VPN
architectures and Virtual router-based layer-3 VPNs. This mechanism
is based on the approach used by BGP/MPLS-IP-VPN for distributing
VPN routing information within the service provider(s). In the
context of L2VPNs, an auto-discovery mechanism enables a PE to
determine the set of other PEs having VPN members in common along
with information relative to each specific L2VPN endpoints such as
attachment circuit identifier, topology information, etc. Each VPN
scheme uses the mechanism to automatically discover the information
needed by that particular scheme.
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