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24-2
ATM and Layer 3 Switch Router Software Configuration Guide
OL-1911-05
Chapter 24 Configuring ATM Router Module Interfaces
Overview of the ATM Router Module
Overview of the ATM Router Module
The ATM router module allows you to integrate Layer 3 routing and ATM switching within a single
chassis. When you install the ATM router module, you no longer need to choose either Layer 3 or ATM
technology, as is frequently the case with enterprise, campus, and MAN applications.
The ATM router module can perform one or more of the functions described in Figure 24-1.
Figure 24-1 ATM Router Module Routing and Bridging Functions
The ATM router module receives Address Resolution Protocol (ARP) messages and route broadcasts
from connected ATM peers and sends the appropriate control information to the route processor. On the
ATM side, the ATM router module connects to the switching fabric as would any other interface module.
On the Catalyst 8540 MSR, the ATM router module supports LANE clients (LECs), but not LANE
servers (LES, LECS, and BUS). It separates the control and data path so that all LANE control messages
are handled by the route processor, and data messages are switched on the ATM router module port, as
shown in Figure 24-2. The LEC is configured on the ATM router module interface, but control message
traffic is sent to the route processor by the ATM router module. The ATM router module sends all ATM
data traffic to the appropriate VCs.
ATM to ATM bridging
ATM
Subnet A
ATM
Subnet A
ATM switch
IP routing of ATM to or from ATM and Ethernet
ATM
Subnet B
ATM
Subnet A
ATM switch
ATM to ATM routing
ATM
Subnet B
ATM switch
ATM
Subnet A
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