Troubleshooting guide

13-8

ATM and Layer 3 Switch Router Troubleshooting Guide

OL-1969-01

Chapter 13 Troubleshooting ATM Router Module Connections

Hardware and Software Restrictions of the ATM Router Module

Figure 13-2 ATM Router Module Traffic Flow (Catalyst 8540 CSR)

The design of ATM router module software is intended to separate the control and data paths so that all

LANE control messages are handled by route processor, and all data is switched on the ATM router

module port.

Note The LightStream 1010 ATM switch allows configuration of LECs only on the controller port

subinterface (for example, the route processor atm2/0/0.subinterface). Thus, all VCs for signaling are

terminated on the route processor.

Figure 13-3 shows the functional architecture of a switch router with an ATM router module installed.

Traffic can enter the switch through any one of the ATM, Fast EtherChannel, or Gigabit Ethernet

interfaces. Then the traffic is either:

• switched across the switch fabric to the route processor for initial route processing

• switched across the switch fabric to the ATM router module to be returned to the switch fabric for

routing through any one of the remaining interfaces

• Layer 2 switched across the switch fabric to any one of the remaining interfaces

Interface slot

ATM interface module

FE or GE interface module

Interface slot

Route processor

Switch processor

Route processor

Interface slot

Power supply 1 Power supply 2

ATM router module

ATM cells NNI

LANE signalling

IPX packets/

Ethernet frames

31333