Figure 1-3 Mpls Vpns Example; Frame Relay To Atm Interworking - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

BPX Switch Operation
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Figure 1-3
VPN B
VPN A

Frame Relay to ATM Interworking

Interworking lets you retain your existing services and migrate to the higher bandwidth capabilities
provided by BPX switch networks, as your needs expand. Frame Relay to ATM Interworking enables
Frame Relay traffic to be connected across high-speed ATM trunks using ATM-standard Network and
Service Interworking.
Two types of Frame Relay to ATM interworking are supported:
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Cisco BPX 8600 Series Installation and Configuration
1-10
– No VPN knowledge in core,
– No need for separate VC mesh per VPN
Highly Scalable
Easy to add new sites
Configure one site on one edge router or switch and network automatically does the rest.
Traffic Separation in MPLS
Each packet has a label identifying the destination VPN and customer site, providing same level of
privacy as Frame Relay.
Flexible Service Grouping
Over a single structure can support multiple services, such as voice VPNs, extranets, intranets,
Internet, multiple VPNs.
MPLS VPNs Example
VPN A
VPN C
VPN B
VPN D
VPN D
IP Based VPNs
Network Interworking (see Figure 1-4)
Performed by the BTM card on the IGX switch and
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Performed bythe FRSM card on the MGX 8220
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Service Interworking (see Figure 1-5).
Supported by the FRSM card on the MGX 8220 and
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– Supported bythe UFM cards on the IGX switch.
VPN D
VPN C
VPN A
VPN B
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 1 The BPX Switch: Functional Overview
MPLS VPN Services
Customer sites connected to
network with Frame Relay,
ATM, xDSL, etc.
Customer sites have ordinary
IP equipment, don't need MPLS
or special VPN equipment.
Provides advantages of IP connectionless
flexibility combined with QoS and
performance advantages of ATM.