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Title : Switched ATM L2VPN
Author(s) : C. Metz et al.
Filename : draft-metz-switched-atm-l2vpn-00.txt
Pages : 34
Date : 2003-6-18
Many providers operate ATM networks that support a suite of network
services. These networks employ ATM signaling and routing protocols to
expedite connection setup and recovery. Over time these providers will
migrate all or portions of their ATM infrastructure and services to an
IP/MPLS-based Packet Switched Network (PSN) thus leading to the
creation of ATM L2VPNs. This document describes a solution that
supports dynamic signaling and routing of point-to-point switched ATM
connections (i.e. VP or VC) across an IP/MPLS network. It is based on
the L2VPN (VPWS) architecture which employs an {attachment circuit, PE,
pseudo-wire, PE, attachment circuit} tuple to define a distinct point-
to-point L2 connection between two end-points within the VPN [PPVPN
L2]. The presumption is that the L2 connection is a switched ATM VC or
VP and that one or both ACs and the PW are established in real-time
using routing and signaling protocol machinery native to the ATM and
IP/MPLS networks. We call this a switched ATM L2VPN.
The key component of a switched ATM L2VPN is a PWE3 native service
processing (NSP) function on the PE that serves as an interworking
gateway between native ATM and IP/MPLS signaling and routing protocols.
The NSP learns of ATM prefixes reachable through the local attachment
circuits. The ATM prefixes are exchanged with a co-resident MP-BGP
instance for automatic distribution and discovery of ATM reachability
to participating PEs and their directly-attached ATM networks. The NSP
is capable of processing the necessary native ATM signaling messages
for real-time connection management. The NSP interacts with the co-
resident PWE3 signaling machinery for concurrent PW connection
management. Extensions to the PWE3 signaling protocol are required to
support dynamic single-sided provisioning and to transport ATM
signaling parameters between the NSPs for connection management
purposes. Extensions to the MP-BGP protocol are needed distribute ATM
prefixes and associated next hop information between PEs.
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