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CPU 100% - STP?

silver_wolf
Level 1
Level 1

Hi, we are have strange problem with sup720-base:

In different time CPU utilization equal ~99-100%

and we have out for service (we haven't ping to the switch!)

I start stp debug all, and when cpu grow to 100% I recieve these messages:

Dec 10 08:38:54: SPANTREETYPE: getting tree type vlan for parameter 1 value 1

Dec 10 08:38:54: stp: begin nvgen vlan 999 config blocks

Dec 10 08:38:54: stp: nvgen state 0 config blocks

Dec 10 08:38:54: stp: nvgen protocol 0 config blocks

Dec 10 08:38:54: stp: nvgen priority 999 config blocks

Dec 10 08:38:54: stp: nvgen hello 0 config blocks

Dec 10 08:38:54: stp: nvgen fwddelay 0 config blocks

Dec 10 08:38:54:et1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=2 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8) stp: n

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 12=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 11=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 9=1 rc=1vgen maxage 0 config blocks

Dec 10 08:38:55: STP CFG: found (462FA4B8)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 4=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 3=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=2 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 12=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 11=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 9=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param mst 0 GigabitEthernet1/4 10=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 7=1 rc=0

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

and more...

maybe somewho know what is it and how it can be fixed?

8 Replies 8

viyuan700
Level 5
Level 5

Is GigabitEthernet interface 1/3 and 1/4 are providing redundancy? Looks like in loop. Is it possible to take out one and see if that break the loop.

This ports is disabled...

witchcraft...

go for show cdp nei command, if you see the same switch then its a loop between ports on the same switch.

does the 100% cpu is reached after you issue debug all command, for information the debug all command is very process intensive.

cdp don't display same switch.

about debug - we enable only spanning-tree debug.

did u try

show processes cpu i think it tells u which process is utilizing that much CPU. Maybe that can help you to crack the problem.

done, but I don't seen any process that utilize CPU

Hello Aleksey,

I lost a C4506 switch just doing debug stp packets so it is quite heavy for the switch.

You say the two ports are disabled are also unplugged ?

Hope to help

Giuseppe

Hello, Guiseppe!

Yes! Ports disabled and unplugged...

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