Troubleshooting guide

13-20
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 13 Troubleshooting ATM Router Module Connections
Troubleshooting RFC 1483 on ATM Router Module Connections
Step 2 Use the show epc ifmapping command with the interface number to confirm the interface VC is mapped
correctly to the ATM interface.
Switch# show epc ifmapping 45
ATM10/0/0.3 (IF number: 45)
The IF number field (in this example, “45”) indicates the interface index number is mapping correctly.
Step 3 Use the show epc ip-address interface command with the IP address to confirm the VC number.
Switch# show epc ip-address interface atm 10/0/0 128.250.20.1
IPaddr: 128.250.20.1 MACaddr: 0000.0c07.ac03 Routed to VC(943)
The information in this display should match the information shown using the show adjacency
command to display the MAC address rewrite.
If you determine that the interface is configured incorrectly, refer to the “Configuring ATM Router
Module Interfaces” chapter in the ATM Switch Router Software Configuration Guide.
Troubleshooting RFC 1483 on ATM Router Module Connections
The primary use of RFC 1483, or multiprotocol encapsulation over ATM (MPOA), is to carry multiple
Layer 3 and bridged frames over ATM. RFC 1483 traffic is routed through the ATM router module
interface using static map lists. Static map lists provide an alternative to using the ATM Address
Resolution Protocol (ARP) and ATM Inverse ARP (InARP) mechanisms.
Note Traffic shaping and policing are not supported on the ATM router module interfaces. Use VP tunnels
as an alternative for traffic shaping on ATM connections.
Troubleshooting RFC 1483 Problems on ATM Router Module Commands
To display the ATM router module and RFC 1483 configuration, use the following commands:
Figure 13-9 is an example network of a switch router with an ATM router module configured with two
RFC 1483 interfaces connecting an Ethernet network and an ATM network.
Command Purpose
show running-config Shows the status of the configuration and
physical interfaces.
show interfaces atm card/subcard/port Shows the status of the physical interface.
show atm vc interface
card/subcard/port.subinterface
Displays the ATM layer connection
information about the virtual connection.
ping ip-address Confirms the IP connection and
increments the transmit and receive cell
counters.