Troubleshooting guide

13-32
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 13 Troubleshooting ATM Router Module Connections
Troubleshooting IP Multicast on ATM Router Module Connections
A point-to-multipoint loopback VC mechanism is used to replicate the packets, when both the root and
leaves of the point-to-multipoint VCs are configured on the ATM router module II interface. The number
of replications is equal to the number of leaves.
To display the ATM router module IP multiplex configuration, use the following commands:
Follow these steps to troubleshoot the ATM router module with IP multicast configured (see the example
network shown in Figure 13-12):
Step 1 Enter the show epc if-entry interface command and test the CAM information between the egress
Gigabit Ethernet interface and the entry ATM interface.
Switch# show epc if-entry interface atm 10/0/0 entry gigabitEthernet 3/0/1
IF Entry for GigabitEthernet3/0/1 on ATM10/0/0
Mac(hex) - 00:90:21:41:88:38
isMyInteface : False isSubInterface : False
Status Up Broute VC - 322 Bcast VC - 0
Netmask: 24
FEC disabled
Trunking Disabled
State : Not-Applicable/Listening/Blocking
Bridge-Group disabled
IP routing on bridging off
IPX routing off bridging off
Appletalk routing off
In Encapsulation:
ICMP Redirect enabled Unreachable enabled
IP Multicast disabled: ttl-threshold: 0
Ver ify :
• That the Broute VC field status is up and note the Broute VC number. In this example, the Broute
VC is “322.”
• That the IP routing is on.
Step 2 Enter the show atm vc interfaces atm command with VPI 0 and VCI 50 to verify the configuration of
the ingress ATM interface connected to the Cisco 7500 router.
Switch# show atm vc interfaces atm 3/0/1 0 50
Interface: ATM3/0/1, Type: quad_oc12suni
VPI = 0 VCI = 50
Status: UP
Packet-discard-option: enabled
Usage-Parameter-Control (UPC): drop
Command Purpose
show epc if-entry interface atm
card/subcard/port entry {fastethernet |
gigabitethernet} card/subcard/port
Displays all interface entry information
for the specific interface.
show atm vc interface atm
card/subcard/port.subinterface VPI VCI
Displays the ATM layer connection
information about the virtual connection.
show epc sm card/subcard/port Shows 1483 SNAP local static map
information.
show epc arm2_exvc-entry interface
card/subcard/port all
Shows external VC Entry in VC-Table.