OS6360 loop-detection problem

[dzoki]

Hi all,

Could you tell me if I have loop on dummy switch who is connected to alcatel OS6360 how i can shutdown port without using loopback-detection?
I try this commands:
qos no user-port filter user-port shutdown bpdu
policy port group UserPorts 1/1/1-24
qos apply

This commands shutdown port (light on port is blinking green) but CPU on the switch goes 100%.
Does anyone have some idea?
Thank you.

[silvio]

Hi, there are two possibility to detect loops at other switches: lbd and userports (your config is okay). You can check with "show violation" that the port is down. If the port is down and the cpu is still 100% than there is an other reason for it. Mostly it is mc traffic. Via the (unprotected) loop this traffic will increased - so that you see the high cpu.
BR Silvio

[dzoki]

Hi Silvio,

I want to with this configuration
qos no user-port filter user-port shutdown bpdu
policy port group UserPorts 1/1/1-24
qos apply
to shutdown port permanently, because alcatel switch when goes CPU 100% has no function. How to solve this issue?
Thank you,
Regards,
dzoki

[silvio]

with the following config you has disabled auto-recovery:

Code: Select all

violation recovery-maximum 0
violation recovery-time 0

default is

Code: Select all

violation recovery-maximum 10
violation recovery-time 300

This means after 300 sec the port will recovered automaticly (from the shutdown state). And after 10 time shutdown/recovery (down/up) the port is permanently blocked.
But you haven't written: is the port shutdown or not when the cpu is at 100%?
If the port is down this can't be the reason for 100%
BR Silvio

[dzoki]

Hi Silvio,

Port is simulated down but blinking green and cpu is 100%.
This is strange to me, like he get from dummy switch on port 1/1/23 bpdu packets all the time and stuck there.
I try everything but still when is loop on dummy switch, alcatel cpu goes 100%.

[silvio]

This is strange: I have understand that you are sure that the loop of the dummy switch is the reason of the high cpu. If you disconnect the loop there the cpu isn't 100% anymore? But the port 1/1/23 at the omniswitch is down (the LED is not important for this).
Please check:
> show interface status -> is the port 1/1/23 down or up?
> show interface 1/1/23 -> is the counter of rx packets (all rx but special the multicast rx) still increasing?
normaly there should no received new packets - so this should not the reason for the high cpu.
BR Silvio