Beta Draft Confidential
8-8
1/19/05
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring ATM Over MPLS Trunks
About ATMoMPLS Trunks
Multiservice MPLS Core Solution Architecture
The Multiservice MPLS Core Solution comprises ATM network edge islands
connected to an MPLS core network, as shown in
. The ATM and MPLS
networks are connected by an ATM switch known as the ATM edge switch (Lucent
CBX 3500, CBX 500, or GX 550), and an IP/MPLS switch known as the MPLS Label
Edge Router (Juniper T-Series). The ATM edge switch and MPLS LER are attached
by a private ATM interface using ATM UNI (CBX 500 IOM1 or GX 550 BIO2
modules) or ATM NNI (GX 550 BIO2 module) cell headers.
Figure 8-3.
ATM Network Edge Islands Connected to MPLS
Core Network
The ATMoMPLS trunk provides the logical link between the ATM edge switches. As
shows, each ATMoMPLS trunk between a pair of ATM edge switches is
matched with a virtual trunk (known as a Lucent Trunk VPN) between a pair of MPLS
LERs that are directly connected to the ATM edge switches. Between the two MPLS
LERs, traffic-engineered MPLS LSPs are signalled by RSVP-TE.
demonstrates:
•
The Lucent ATM edge switches connected by an ATMoMPLS trunk over an
IP/MPLS core network.
•
Juniper LERs as Provider Edge (PE) routers interfacing with the Lucent ATM
edge switches.
•
The PE-to-PE LSP with QoS information embedded in the EXP bits of the MPLS
header. This E-LSP is also known as the Public Switched Network (PSN) tunnel.
•
The Lucent Trunk VPN, which is the inner tunnel within an E-LSP that carries
ATMoMPLS traffic.
Lucent GX 550
Lucent GX 550
Juniper T-Series
Juniper T-Series
ATM over MPLS Trunk
MPLS Core
ATM Network
ATM Network
Содержание CBX 3500
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