Problem with 3750 switch

[shahryarmunir]

Hi,

All of a sudden my 3750 switch port LED's start blinking very quickly and the network is down. Please help me

[michal.grzelak]

Hi,

That might be a lot of things, e.g. spanning-tree loop or DoS atack. Please conect via console to this switch and provide logs from that period. Network diagram also would be helpful.

Regards:

Michal

[shahryarmunir]

Hi Michal,

Plz tell me how to get logs

Thanks,

[spremkumar]

Hi

Did you try logging onto the console port of the switch ?

regds

[shahryarmunir]

Hi,

Please tell me how to enable logging

Thanks\

[spremkumar]

hope this helps..

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a008081df0c.html#wp1052794

regds

[Jens Becker]

When you're connected over serial:

in configure mode:

logging console debug

-> logging is enabled for console

When you're connected over ip:

in configure mode:

logging monitor debug

terminal monitor

-> logging is enabled for terminal

Proof logging preferences:

sh logging

Be careful with logging to console.

regards

Jens

[CHN]

i think it was caused by broadcast stom.to check if span-loop occured.