Troubleshooting guide

12-18
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 12 Troubleshooting Layer 2 Interfaces
Troubleshooting Fast EtherChannel Problems
5 minute output rate 2000 bits/sec, 1 packets/sec
24335602 packets input, 2345055668 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
1366573 packets output, 289782286 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Switch#
Step 2 Check the Port-channel field. It should indicate up.
Step 3 Note the MAC address assigned to the port channel. It will be used in Step 4.
Step 4 Use the show epc if-entry interface command with the entry interface parameters to display the status
of the Broute VCs.
Switch# show epc if-entry interface fastEthernet 1/0/4 entry port-channel 1
IF Entry for Port-channel1 on FastEthernet1/0/4
Mac(hex) - 00:10:07:3C:05:13
isMyInteface : True isSubInterface : False
Status Up Broute VC - 97 Bcast VC - 0
Netmask: 32
FEC enabled ( Flow-based Load-balancing )
Trunking Enabled
State : Not-Applicable/Listening/Blocking
Bridge-Group disabled
IP routing off bridging off
IPX routing off bridging off
Appletalk routing off
In Encapsulation:
ICMP Redirect enabled Unreachable enabled
IP Multicast disabled: ttl-threshold: 0
ACL Indexs:
Input ACL: 0 Output ACL: 0
ACL Flags:
Input IP: OFF Output IP: OFF
Input IPX: OFF Output IPX: OFF
Switch#
Step 5 Confirm that the MAC address in this step matches the MAC address displayed in Step 1.
For inconsistencies between the adjacency table and the EPC IP address table, use the clear arp or clear
adjacencies command to rebuild the tables. When you use these commands, the router will send an ARP
request for all entries in the ARP cache. As replies come back, it will refresh the cache. If any entries
time out, they will be cleared from the table. The router will then build the adjacency table using this
information, and populate the interface EPC IP address table.
Step 6 Use the show epc if-entry interface command with the entry interface parameters to display the status
of the VCs.
Switch# show epc fe-channel interface fastEthernet 1/0/4 channel port-channel 1
FEC Group (Port-channel1) Information on FastEthernet1/0/4
Member 0 VC - 97
Member 1 VC - 177
Member 2 VC - 217
Member 3 VC - 217
Member Ship BitMap 0x7
Switch#