my switch is blinking

[lyes.ouarti]

hi,

i have a 2950 switch connected to a 1750, the switch blinks yellow and then green every 2 min, with some packet loss.

anyone has an idea why???

thanks.

[Georg Pauwen]

Hello,

alternating yellow/amber/green means that there is a link fault.

According to the Cisco documentation, ´Error frames can affect connectivity, and errors such as excessive collisions, CRC errors, and alignment and jabber errors are monitored for a link-fault indication´.

Can you post the output of ´show interfaces X´ for the 2950, where X is the port of the 2950 where the router is connected to ?

I would try and change the cable, and also to connect the router to another switchport.

HTH,

Georg

[lyes.ouarti]

hi, here is a show run:

interface FastEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

no ip address

no mdix auto

and a sh int fa0/1

FastEthernet0/1 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 000f.f7fb.e483 (bia 000f.f7fb.e483)

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 00:00:02, output 00:00:00, 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: 0/40 (size/max)

5 minute input rate 150000 bits/sec, 2 packets/sec

5 minute output rate 3000 bits/sec, 4 packets/sec

701576 packets input, 638867791 bytes, 0 no buffer

Received 1407 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 1329 multicast, 0 pause input

0 input packets with dribble condition detected

961622 packets output, 546896862 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

--More--

961622 packets output, 546896862 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

thanks.

[aashish.c]

Hi,

the output seems to b fine. did u try changing the cable and another switchport, that should help.

and can u also paste the router`s port config. also try sending large amount of pings and check whether you get any losses.

Did u find anything unusual in logs for this switchport.

Kindly update

aashish C