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24-8
ATM and Layer 3 Switch Router Software Configuration Guide
OL-1911-05
Chapter 24 Configuring ATM Router Module Interfaces
Hardware and Software Restrictions of the ATM Router Module
Catalyst 8540 MSR and LightStream 1010 ATM Router Module Software
Restrictions
The following software restrictions apply to the Catalyst 8540 MSR enhanced 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.
• RFC 1483 on the ATM router module supports only AAL5 SNAP encapsulation.
• 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 pair 0 and 1 and slot pair 3 and 4 use the same switching modules for scheduling. For example,
do not install an ATM router module in slot 1 when hierarchical VP tunnels are configured on slot 0.
For more information on hierarchical VP tunneling restrictions, see Chapter 6, “Configuring Virtual
Connections.”
• RFC 1577 SVCs
• LANE clients are not supported.
• Only UBR PVCs are supported.
• IP multicast is only supported over 1483 LLC/SNAP encapsulated PVCs.
The Catalyst 8510 MSR and LightStream 1010 ATM router modules do not support the following
features:
• Point-to-point subinterfaces. Only point-to-multipoint subinterfaces are supported.
• Tag-edged router functionality
• SSRP
• 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
• Access lists for ATM to ATM routing
• Half-bridge devices
• RFC 1483 MUX encapsulation
• IP multicast over RFC 1483 SVCs
• ACLs for IP, and standard ACLs for IPX