Beta Draft Confidential
Configuring ATM Over MPLS Gateway Solution on CBX 3500
ATM Over MPLS Application Overview
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/059-3
ATM Over MPLS Application Overview
In this release, there are four applications for routing ATM data over MPLS core
networks:
• ATMoMPLS Trunking
• Layer 2 tunnel over an MPLS core network
• PWE3 over an MPLS core network
These applications are described in the following sections.
ATMoMPLS Trunking
ATMoMPLS trunks support a multiservice MPLS core solution by enabling
connection of Lucent ATM switches to MPLS core networks. In this implementation,
the MPLS core simulates a series of virtual trunks that connect to the ATM network
islands. The virtual trunks consist of ATM circuits that are mapped to MPLS label
switched paths (LSPs). The MPLS LSPs are used to tunnel data between the ATM
networks.
This feature is designed to provide interoperability with Juniper T-series (T640 and
T320) routers running JUNOS Release 6.4 or above.
For more information on this feature and complete configuration instructions, see
Chapter 8, “Configuring ATM Over MPLS Trunks.”
Layer 2 Tunnel Over an MPLS Core Network
To enable a connection through an MPLS core network, with two endpoints in
different ATM or Frame Relay networks, a Layer 2 tunnel needs to be established
between the two ATM networks on ATM-MPLS gateway switches. All supported
legacy services, including Frame Relay and ATM can then be tunneled through the
Layer 2 tunnel.
In this configuration, the Layer 2 tunnel is statically provisioned on the gateway
switches. An MPLS/PSN tunnel is established using RSVP-TE signalling based on
OSPF-TE routing between CBX 3500 switches using a POS Interface. Then the
Layer 2 tunnel is created between the two CBX 3500 nodes, using a static
configuration (i.e. no signaling is required to exchange the Layer 2 tunnel labels).
Resource Reservation Protocol - Traffic Extension (RSVP-TE) signalling is used for
the PSN tunnel (see “Configuring a PSN Tunnel” on page 9-43).
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