Cisco Troubleshooting

[mitelmmaniac]

Hi,

Im a bit of a network noob. Could someone please tell me (if i am not talking rubbish) how i would look at the logs of a port on a switch. I need to see if there were any errors for the same time one of my ipphones loses connectivity.

Thanks,
MM

Desk Jockey Lunacy

 

[imbadatthis]

C3550#show interfaces fa0/1
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 000c.8570.d181 (bia 000c.8570.d181)
MTU 1546 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, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 9000 bits/sec, 9 packets/sec
5 minute output rate 7000 bits/sec, 9 packets/sec
35350821 packets input, 3439444082 bytes, 0 no buffer
Received 1524741 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1524671 multicast, 0 pause input
0 input packets with dribble condition detected
33393885 packets output, 680674197 bytes, 0 underruns
0 output errors, 0 collisions, 1 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


We must go always forward, not backward
always up, not down and always twirling twirling towards infinity.

 

[Quadratic]

Also "show logging". Assuming a log buffer is in place and your network time is set, those logs should be able to tell you if the port is or has lost link. It won't record specific input errors, but it should/can be set to give a good timestamp.

CCNP, CCDP

 

[mitelmmaniac]

thankyou both

Desk Jockey Lunacy