Troubleshooting guide

13-5
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
Catalyst 8540 CSR ATM Router Module Software Restrictions
The following software restrictions apply to the Catalyst 8540 CSR ATM router module:
• Use tag switching functionality with caution. Do not distribute routes learned through tag switching
to FE or 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.
• ATM Director does not support any PVC commands.
• On an ATM router module interface, only LANE clients or RFC 1483 can be configured.
Note LANE clients or RFC 1483 can be configured on multiple ATM router module interface
simultaneously.
• RFC 1483 on the ATM router module supports only AAL5 SNAP encapsulation.
• Up to 2048 external VCs can be configured on each ATM router module interface.
• You can have a maximum of 64 LECs per chassis.
• Do not install an ATM router module in a slot pair with hierarchical VP tunnels 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, refer to the
“Configuring Virtual Connections” chapter in the ATM Switch Router Software Configuration
Guide.
• Token Ring LANE is not supported.
The Catalyst 8540 CSR ATM router modules do not support the following features:
• Point-to-point subinterfaces. Only point-to-multipoint subinterfaces are supported.
• Tag-edged router functionality
• Fast Simple Server Redundancy Protocol (SSRP)
• Bridging for multiplexing device encapsulation
• PIM IP multipoint signalling
• PIM NBMA
• PIM over ATM multipoint signalling
• Translation from IP QoS to ATM QoS
• RSVP to ATM SVC
• Access lists for ATM to ATM routing
• Half-bridge devices
• RFC 1483 MUX encapsulation
• ACL support for IP, and standard ACL support for IPX
• IP fragmentation support.
• IP 6-path load balancing support.