Solved: C2960 port loop disable ports

Jan Rockstedt · ‎05-09-2008

Hi,

We had a problem with a C2960.

Someone grab a cable and added to two switch port in the same switch.

The switch disable our other two trunk ports with udld configure.

How do I configure the switch to disable only the two loop port and not the trunk ports?

//Jan

andrew.prince · ‎05-09-2008

Another way - would be:-

spanning-tree portfast bpduguard default, this will disable the specific port where the loop was deteted.

And to save you time, checking the ports and re-enabling them after a loop has been removed:-

errdisable recovery cause bpduguard

errdisable recovery cause udld

errdisable recovery interval ## (seconds)

HTH.

andrew.prince · ‎05-09-2008

See my prevous post.

Pravin Phadte · ‎05-09-2008

If the ports are not been used. Then the best way would be to admin shut them.

andrew.prince · ‎05-09-2008

Another way - would be:-

spanning-tree portfast bpduguard default, this will disable the specific port where the loop was deteted.

And to save you time, checking the ports and re-enabling them after a loop has been removed:-

errdisable recovery cause bpduguard

errdisable recovery cause udld

errdisable recovery interval ## (seconds)

HTH.

Jan Rockstedt · ‎05-09-2008

No solution, we need to have the port up.

How can we setup the switch to only disable the user port and not the trunk port?

-J-

Pravin Phadte · ‎05-09-2008

If you can recrete the problem try to

configure port security in one of the option and find out which one would help.

Switch)# config t

Switch(config)# int fa0/10

Switch(config-if)# switchport port-security ?

aging Port-security aging commands

mac-address Secure mac address

maximum Max secure addresses

violation Security violation mode

let me know if this does help

andrew.prince · ‎05-09-2008

See my prevous post.