Cisco Systems 8600 Series manual Frame Relay to ATM Network and Service Interworking

Models: 8600 Series

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C H A P T E R 1 2

Frame Relay to ATM Network and Service Interworking

This chapter describes Frame Relay to ATM interworking. Frame Relay to ATM Interworking allows users to retain their existing Frame Relay services, and as their needs expand, migrate to the higher bandwidth capabilities provided by BPX switch ATM networks.

This chapter contains the following:

Service Interworking

Networking Interworking

ATM Protocol Stack

AIT/BTM Interworking and the ATM Protocol Stack

AIT/BTM Control Mapping, Frames and Cells

Management, OAM Cells

Functional Description

Management

Frame Relay to ATM Interworking enables frame relay traffic to be connected across high-speed ATM trunks using ATM standard Network and Service Interworking (see Figure 12-1and Figure 12-2).

Two types of Frame Relay to ATM interworking are supported, Network Interworking and Service Interworking. The Network Interworking function is performed by the AIT card on the IPX switch and by the BTM card on the IGX switch. The FRSM card on the MGX 8220 supports both Network and Service Interworking. See Figure 12-3for some examples of ATM to Frame Relay Interworking.

Frame Relay to ATM Network and Service Interworking 12-1

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Cisco Systems 8600 Series manual Frame Relay to ATM Network and Service Interworking