Troubleshooting guide

13-25
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 13 Troubleshooting ATM Router Module Connections
Troubleshooting RFC 1577 on ATM Router Module Connections
Troubleshooting RFC 1577 on ATM Router Module Connections
Classical IP over ATM is an IETF protocol that uses high speed ATM connections to provide better
connections between IP members. The classic logical IP subnet (LIS) is implemented over an ATM
switching network using an ATMARP server to replace the broadcast ARP service. IP over ATM is a
Layer 3 switching service, where IP and ARP datagrams are encapsulated in AAL5 using IETF RFC1483
LLC/SNAP encapsulation as the default. RFC1577 provides for “best effort” service only. However,
Resource Reservation Protocol (RSVP) over ATM enhances classical IP to support RSVP signalling,
allowing differentiated QoS over an ATM network.
Troubleshooting RFC 1577 Problems on the ATM Router Module Commands
To display and troubleshoot the ATM router module and RFC 1577 configuration, use the following
commands:
Figure 13-10 is an example network of a switch router with an ATM router module configured with two
RFC 1577 connections between Ethernet networks and an ATM network.
Figure 13-10 ATM Router Module RFC 1577 Example 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.
show atm map Confirms the static connection to the
ATM ARP server.
Ethernet
3.3.0.0/16
Ethernet
1.1.0.0/16
Cisco 7500
Cisco 7500
Catalyst 8510 or 8540
with ATM router module
int atm10/0/0.1 (ARM), 1.1.1.2
int atm10/0/1.3 (ARM), 3.3.0.2
52142
ATM
Ethernet
2.2.0/16
ARP
Server
SI