Troubleshooting guide

13-3
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
On the Catalyst 8540 CSR, the ATM router module supports LANE clients (LECs), but not the LANE
servers (LES, LECS, and BUS). It separates the control and data path so that all LANE control messages
are handled by the route processor, and data messages are switched on the ATM router module port, as
shown in Figure 13-8. (See the “Comparing Data Plane and Control Plane Traffic” section on page 11-20
for a description of control and dataplane traffic.) The LEC is configured on the ATM router module
interface, but control message traffic is sent to the route processor by the ATM router module. The ATM
router module sends all ATM data traffic to the following VCs:
• In a LANE environment, the ATM router module sends all ATM data traffic to the Data Direct VCs.
• In an RFC 1483 environment, or multiprotocol encapsulation over ATM (MPOA), the ATM router
module sends all ATM data traffic to the corresponding PVC.
• In an RFC 1577 environment, the ATM router module sends all ATM data traffic to the
corresponding SVC.
Note The Catalyst 8540 CSR enhanced ATM router module does not support LANE clients.
The ATM router module has no external interfaces. All traffic is sent and received through internal
interfaces to the switching fabric. The Catalyst 8540 CSR enhanced ATM router module has two internal
ports. See the “Understanding Packet and Cell Flow” section on page 13-7 for a description of how the
ATM router module interfaces connect to the other interfaces.
Hardware and Software Restrictions of the ATM Router Module
This section describes hardware and software restrictions for the ATM router module that could cause
you connection or configuration problems.
Hardware Restrictions
The following hardware restrictions apply to the Catalyst 8540 CSR, Catalyst 8510 MSR, and
LightStream 1010 ATM router modules, and the Catalyst 8540 CSR enhanced ATM router modules:
• You can install the ATM router module in any slot except a route processor slot and, in the case of
the Catalyst 8540 CSR, a switch processor slot.
• The ATM router module is only supported on LightStream 1010 ATM switches that have a
multiservice ATM switch route processor with FC-PFQ and the Catalyst 8510 MSR system software
image.
• You can install up to two ATM router modules per chassis.
• When you hot swap an ATM router module, wait one minute after removing the module before
inserting a new module.
Note The ATM router module is only supported on ATM switches that have a multiservice ATM
switch processor installed.