11M traffic in on a 10M ethernet port.

shahaij · ‎01-25-2005

Dear sir,

I met a very curious problem. Here is my topology.

FE 1/0/0 -> transceiver--fiber--transceiver <- remote switch

the FE PA is PA-FE-TX-ISL.

I setup my Fe 1/0/0 with 'speed 10':

"

interface FastEthernet1/0/0

ip route-cache distributed

speed 10

"

My question is with that configuration. My transmit speed is limited under 10M bps. how about my receive speed? is there any limitation? I found:

"

R2#sh int fa1/0/0

FastEthernet1/0/0 is up, line protocol is up

......

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 144/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Half-duplex, 10Mb/s, 100BaseTX/FX

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

......

5 minute input rate 11047000 bits/sec, 1804 packets/sec

5 minute output rate 5653000 bits/sec, 1414 packets/sec

182099585 packets input, 4272178015 bytes, 0 no buffer

Received 1057 broadcasts, 0 runts, 0 giants, 0 throttles

7001 input errors, 6979 CRC, 0 frame, 0 overrun, 21 ignored

0 watchdog, 0 multicast

0 input packets with dribble condition detected

830859670 packets output, 2044740 bytes, 0 underruns

2924 output errors, 8772151 collisions, 0 interface resets

0 babbles, 2146 late collision, 1 deferred

25 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

"

is that mean my FE interface only transmit traffic under 10M bps, but it acturally works in 100M mode with it's neighbor?

I'm confused about that.

Thank you very much.

Regards,

Sha

milan.kulik · ‎01-25-2005

Hi,

I'd check the other line side speed/duplex.

Try sh int on the remote switch and check the output.

If you don't see

"Half-duplex, 10Mb/s",

it's not configured the same way.

I'd guess it's left in "auto" mode and the speed/duplex negotiaition failed, so it's running in 100Mb/s probably.

Have you cleared the interface counters recently?

If you do so and see the error counters increasing, there is something wrong.

You can paste the sh int output to the TAC Output interpreter tool (https://www.cisco.com/cgi-bin/Support/OutputInterpreter/home.pl) and see the advices.

Regards,

Milan

shahaij · ‎01-26-2005

Milan,

I've checked transceiver's status. It runs in 100M mode. So I think this interface works at 100M mode also.

But what the function of this command? -- speed 10

and is there something wrong in output of 'show interface'?

And I tried output interpreter tool. Got nothing, as that tool care error statistics.

Regards,

Sha