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3550 output buffer failure

chrish
Level 1
Level 1

Below is the output from a show interface command on a 3550. I am seeing this on many interfaces. I am concerned with the output underruns and ouput buffer failures. It is my understanding that this is caused by the switch transmitting faster than the end device can receive. Is this correct and is there any other possible explanation to look into before suggesting we upgrade to gig switches??

Thanks

FastEthernet0/7 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 000f.3401.9387 (bia 000f.3401.9387)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

input flow-control is off, output flow-control is off

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:01, output hang never

Last clearing of "show interface" counters 2w1d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1000 bits/sec, 2 packets/sec

5 minute output rate 5000 bits/sec, 8 packets/sec

30880653 packets input, 3724753558 bytes, 0 no buffer

Received 7039 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

34089225 packets output, 3374649008 bytes, 36835 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

36835 output buffer failures, 0 output buffers swapped out

1 Reply 1

Prashanth Krishnappa
Cisco Employee
Cisco Employee

Use a sniffer and check for any unicast flooding or any multicast traffic in the network. There was a bug filed but it is closed since it was determined that the problem was due to over subscription of the output interface.

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdy09531