Input Errors

[lee.messenger]

Hi,

I have a Cisco 2960 switch connected from port f0/48 to port F5/48 on a Cisco 6500 via a cross-over cable. The link is configured as a trunk (mode=on). Both interfaces are set to 100mb and Full-Duplex. The average amount of traffic traversing the link is 2mb/s

I am seeing input errors on F5/48 on the 6500.

So far I have done the following:

Changed cabling

Changed port on 2960

Set speed duplex on both interfaces to auto

Changed port on 6500.

I am still receving input erros. Any ideas how I could fix this ?

Thanks

Lee

[mheusinger]

Hi,

which number of errors do you get, can you post the relevant show interface command?

Second, given the fact you already swapped ports and cabling, what did not change? Are there any strong electromagnetic fields nearby or any other external influences? Are there other affected ports?

Could also be backplane/hardware of an involved switch.

Hard to say without further info.

Regards, Martin

[mheusinger]

Hi,

which number of errors do you get, can you post the relevant show interface command?

Second, given the fact you already swapped ports and cabling, what did not change? Are there any strong electromagnetic fields nearby or any other external influences? Are there other affected ports?

Could also be backplane/hardware of an involved switch.

Hard to say without further info.

Regards, Martin

[lee.messenger]

Hi,

Output from show interface on the 6500 below.

There are no other affected interfaces, there is another 2960 above the one in question and that isn't generating any errors at all. the cabling from that switch follows the same physical path, which is only 3 metres long. I'm starting to suspect a faulty 2960.

Any ideas ?

FastEthernet5/48 is up, line protocol is up (connected)

Hardware is C6k 100Mb 802.3, address is 0005.7487.ac2b (bia 0005.7487.ac2b)

Description: **LONSWI04**

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

reliability 237/255, txload 5/255, rxload 4/255

Encapsulation ARPA, loopback not set

Full-duplex, 100Mb/s

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

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

Last input 00:00:50, output 00:00:07, output hang never

Last clearing of "show interface" counters 3d21h

Input queue: 0/2000/14/0 (size/max/drops/flushes); Total output drops: 1322

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1581000 bits/sec, 214 packets/sec

5 minute output rate 2136000 bits/sec, 931 packets/sec

64124920 packets input, 47333610827 bytes, 0 no buffer

Received 4351616 broadcasts (17062 multicast)

5 runts, 0 giants, 0 throttles

25484366 input errors, 27 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

180755375 packets output, 70549901345 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 PAUSE output

0 output buffer failures, 0 output buffers swapped out

[mheusinger]

Well this is quite a high number of errors.

The definition states:

"Includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts. Other input-related errors can also cause the input errors count to be increased, and some datagrams may have more than one error; therefore, this sum may not balance with the sum of enumerated input error counts."

There are also runts!? Is the same 2960 seeing errors or any attached device?

[lee.messenger]

Hi,

thanks for your reply, I have checked all the interfaces on the 2960 and none of them are showing any input errors of any kind at all. The amount of input errors on F5/48 on the 6500 is still incrementing steadily.

Thanks

Lee

[rharvey57]

Lee,

Have you tried to switch the port to another on the 6500? The reliability is also below 171/255, it could be a bad port / pin on the Cat6500,

Please Advise,

[lee.messenger]

hi,

Yes, tried a different port on the 6500 with the same results.

Lee