Beta Draft Confidential
8-101/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring ATM Over MPLS Trunks
About ATMoMPLS Trunks
ATMoMPLS trunks do not support:
• Lucent IP Services Multipoint-to-Point (MPT) functionality
• The PNNI protocol
• Network management connectivity over the ATMoMPLS trunk during initial
switch installation and configuration
About the Lucent Trunk VPN
The Lucent Trunk VPN, the MPLS component of the ATMoMPLS trunk
implementation, is designed to provide a scalable means of:
• Mapping ATM traffic from ATM trunks to MPLS LSPs on ingress.
• Mapping traffic from the MPLS LSPs on the high-speed interfaces of the MPLS
LER to the ATM trunks, while preserving QoS characteristics.
For every ATMoMPLS trunk configured between an ATM switch and an MPLS LER,
the MPLS router creates a Lucent Trunk VPN logical entity. Each Lucent Trunk VPN
carries traffic on 32 VPIs so that:
• One VPI is associated with signalling, label distribution, and OAM functions
• The remaining 31 VPIs are used exclusively to transport traffic, with full 16 bits of
VCI address space provisioned and available to carry traffic for a mix of VCC or
VPC connections
Signaling for the 31 VPIs and the VCI occurs on the Lucent ATM interfaces only, and
is transparent to the MPLS router interfaces.
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