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Two 6509's with FA0 Errors & Poor Reliability on WS-X6101-OC12 Module


I have two 6509's, at seperate locations on a 622Mbps ATM WAN and they are both exhibiting the same 'errors' on the Fa0 interface of the WS-X6101-OC12-SMF ATM module.

When I session onto the WS-X6101-OC12 module and do a 'sho int' all is ok except for the FastEthernet Interface to the backplane. It shows 129/255 reliability and output errors almost matching the output packet count.

Both 6509's have the same problem. One 6509 has dual Supervisor I's with MSFC1's and the other has a dual Supervisor II's with MSFC2's.

Here is the sho int Fa0 output. Can you help confirm if this is a known problem or is it normal for this particular interface.

Many thanks,


Core_1_ATM#sho int fa0

FastEthernet0 is up, line protocol is up

Hardware is AmdFE, address is 0000.0500.0000 (bia 0000.0500.0000)

Internet address is

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

reliability 129/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Unknown duplex, Unknown Speed

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

Last input 00:00:00, output 00:00:00, 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 3000 bits/sec, 7 packets/sec

5 minute output rate 3000 bits/sec, 7 packets/sec

138688986 packets input, 2636540910 bytes

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast

0 input packets with dribble condition detected

140552200 packets output, 1085913711 bytes, 2388 underruns

140552199 output errors, 2153 collisions, 0 interface resets

0 babbles, 0 late collision, 18528 deferred

140552199 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Community Member

Re: Two 6509's with FA0 Errors & Poor Reliability on WS-X6101-OC


You might want to look at the Field notices, and maybe in the Bug Tool.

Either way you look it doesn't look good. The reliability should not be normally like that but 255/255. So there is a problem.



Community Member

Re: Two 6509's with FA0 Errors & Poor Reliability on WS-X6101-OC

Hi Corey,

Thanks for the info and the confirmation that it is a fault. I have already had a look at the bug tool already and did not find anything useful.

Although not a perfect match, the Field notice does look quite interesting and may be worth trying. However this as a core network in a hospital and I cannot easily get down-time so I will have to keep looking for a more specific solution for now.

Many thanks,


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