Troubleshooting guide

13-2
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 13 Troubleshooting ATM Router Module Connections
Overview of Integrated Layer 3-to-ATM Switching and Routing
Overview of Integrated Layer 3-to-ATM Switching and Routing
This section describes the ATM router module that can be installed in Catalyst 8540 MSR and
Catalyst 8540 CSR chassis that allows direct connections from the Layer 3 Ethernet network to the ATM
backbone.
ATM Router Module Overview
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 a combination of the functions described in Figure 13-1.
Figure 13-1 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.
ATM to ATM bridging
Ethernet to Ethernet bridging
ATM
Subnet A
ATM
Subnet A
ATM switch
IP routing of ATM to or from ATM and Ethernet
ATM
Subnet A
ATM
Subnet B
ATM switch
ATM to ATM routing
ATM
Subnet A
ATM switch
ATM
Subnet B
52043
ATM
Subnet A
Ethernet
Subnet B
ATM switch
ATM switch
Ethernet
Subnet A
Ethernet
Subnet A