Troubleshooting guide

10-37
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 10 Troubleshooting Ethernet, ATM Uplink, and POS Uplink Interfaces
Troubleshooting ATM Uplink with Enhanced Gigabit Ethernet Interface Modules
Step 3 Use the show interface atm card/subcard/port command to check the interface status.
Switch# show interface atm 3/0/0
ATM3/0/0 is up, line protocol is up
Hardware is epif_port_garfield, address is 0090.2141.b037 (bia 0090.2141.b037)
MTU 4470 bytes, sub MTU 4470, BW 622000 Kbit, DLY 10 usec, rely 110/255, load 1/255
Encapsulation ATM, loopback not set, keepalive not supported
Half-duplex, Unknown Speed
ARP type: ARPA, ARP Timeout 00:15:00
Encapsulation(s): AAL5 AAL3/4, PVC mode
8191 maximum active VCs, 1024 VCs per VP, 1 current VCCs
VC idle disconnect time: 300 seconds
Last input 00:00:09, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
32 packets input, 2820 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
10 packets output, 1120 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Step 4 Check the status of the interface. If the ATM interface is down and the line protocol is down, begin
checking for active alarms and defects.
Step 5 Check the MTU field. This indicates the largest number of bytes of “payload” data a frame can carry,
not counting the frame's header and trailer. For an ATM interface, the MTU should be 4470 bytes.
Step 6 Check the Last input and Last output fields. They show the number of hours, minutes, and seconds since
the last packet was successfully received or transmitted by the interface.