Hi Martin,
Can't say for sure but what may have happened is that Gi0/24 on the
2960G may have entered the err-disable state for some reason (one
possibility is a temporary bridging loop - check your spanning tree
settings). When a port is in err-disable state the output of the "show
interfaces" command shows no deviation from when the port is operating
normally so you need to do a "show interfaces status". Once a port
enters the err-disable state the only way to restore normal operation is
to issue the "shutdown" and "no shutdown" commands. You can use the
"errdisable recovery interval" command to set a timer for a port to
automatically come out of err-disable state, however this should be used
with caution (there is usually a good reason for a port to enter the
err-disable state so it isn't a good idea to re-enable it before the
root cause is resolved).
Cheers,
Terence
-------- Original Message --------
*Subject: *[c-nsp] What happens during the "shutdown" and "no shutdown"
to a 1000BASE-LX10 port
*From: *Martin T <[email protected]>
*To: *[email protected]
*Date: *10/08/2011 11:56 PM
I have a following connection:
WS-C2960G-24TC-L[Gi0/24]<-> [1/8]Brocade_switch
..and today after few flaps between the two switches because of the
cabling works, the ports in both switches came up:
Gi0/24 -> Brocade connected trunk a-full a-1000 1000BaseLX SFP
..and according to "show interfaces Gi0/24 switchport", the I Gi0/24
seemed to be working fine. However, I could not see any MAC addresses
on VLAN's allowed to this trunk port. Finally I did "shutdown" and "no
shutdown" to the Gi0/24 port and all of the sudden, I saw MAC
addresses on VLAN's. There were no differences in "show int status" or
"show int Gi0/24" before and after the "shutdown" and "no shutdown". I
don't manage the Brocade switch. SFP in Gi0/24 is made by Finisar.
There is nothing interesting in the log of the Cisco switch.
I'm just curious, what might happened and how did the "shutdown"/"no
shutdown" improve the situation? Or is it impossible to analyse such
problems(afterwards)?
regards,
martin
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