Cisco Systems OL-1911-05 manual 24-6

Chapter 24 Configuring ATM Router Module Interfaces

Hardware and Software Restrictions of the ATM Router Module

Catalyst 8540 MSR Enhanced ATM Router Module Software Restrictions

The following software restrictions apply to the Catalyst 8540 MSR enhanced ATM router module:

•LANE is not supported.

•LANE Clients are not supported.

•Use tag switching functionality with caution. Do not distribute routes learned through tag switching to Fast Ethernet (FE) or Gigabit Ethernet (GE), or vice versa. Otherwise, you might have unreachable route destinations.

•The ATM router module does not initialize if it replaces an ATM port adapter or interface module when hierarchical VP tunnels are globally enabled. Reboot the switch to initialize the ATM router module.

•IP multicast is only supported over 1483 LLC/SNAP encapsulated PVCs.

•ATM Director does not support any PVC commands.

•Even though each ATM router module interface supports a maximum of 2048 VCs, only 1400 to 1500 external VCs can be configured. Internal VCs use up the rest.

•Do not install an ATM router module in a slot pair where hierarchical VP tunnels are configured. Slot pairs 0 and 1, 2 and 3, 9 and 10, and 11 and 12 use the same switching modules for scheduling. For example, do not install an ATM router module in slot 10 when hierarchical VP tunnels are configured on slot 9. For more information on hierarchical VP tunneling restrictions, see Chapter 6, “Configuring Virtual Connections.”

The Catalyst 8540 MSR enhanced ATM router modules do not support the following features:

•Tag-edged router functionality

•Fast Simple Server Redundancy Protocol (FSSRP)

•Bridging for multiplexing device encapsulation

•Protocol Independent Multicast (PIM) IP multipoint signalling

•PIM nonbroadcast multiaccess (NBMA)

•PIM over ATM multipoint signalling

•Translation from IP quality of service (QoS) to ATM QoS

•Resource Reservation Protocol (RSVP) to ATM SVC

•PVC management using ILMI

•IP multicast over RFC 1483 SVCs

•Access lists for ATM to ATM routing

•Half-bridge devices

•Layer 2 ACLs

ATM and Layer 3 Switch Router Software Configuration Guide

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