01-27-2015 03:20 AM - edited 03-07-2019 10:24 PM
Hi,
I'm looking for an explenation.
I have disabled spanning-tree on my stacked catalyst 3750's.
switch#sh spanning-tree
No spanning tree instance exists.
However the spanning tree process still remains at 30+%.. some moments the switch goes to 80%+
switch#show processes cpu sorted | exc 0.00
CPU utilization for five seconds: 51%/4%; one minute: 53%; five minutes: 58%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
220 26998131352225719811 0 32.53% 32.19% 32.58% 0 Spanning Tree
9 18731538913567807945 0 3.66% 3.43% 3.94% 0 ARP Input
167 2252711720 65652703 34313 3.50% 3.16% 3.13% 0 PI MATM Aging Pr
145 4523379461399674340 323 1.11% 1.13% 1.08% 0 Hulc LED Process
106 204130136 98476206 2072 0.47% 0.30% 0.28% 0 hpm counter proc
41 90142651 15430079 5842 0.15% 0.15% 0.15% 0 Compute load avg
44 27196496 18587099 1463 0.15% 0.04% 0.05% 0 HC Counter Timer
35 44370625 66207940 670 0.15% 0.08% 0.06% 0 Per-Second Jobs
72 29120406 110630763 263 0.15% 0.03% 0.03% 0 hrpc <- response
155 106052423 54633914 1941 0.15% 0.16% 0.15% 0 HRPC qos request
200 522703385 549493508 951 0.15% 1.08% 1.04% 0 CDP Protocol
81 28065178 108474059 258 0.15% 0.08% 0.07% 0 HRPC hlfm reques
Anyone has an idea why this is?
Thanks !
01-27-2015 05:48 AM
Hi,
What version of IOS are you running?
01-27-2015 06:03 AM
HI,
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
Cisco_Switch_DC uptime is 2 years, 9 weeks, 4 days, 16 hours, 51 minutes
System returned to ROM by power-on
System restarted at 21:49:45 CET Tue Nov 20 2012
System image file is "flash:/c3750-ipservicesk9-mz.122-55.SE5.bin"
01-27-2015 05:30 PM
Upgrade to 12.2(55)SE9. The version you're running is not yet stable.
06-26-2019 07:46 AM
Hello guys,
I'm having this same problem, STP is disabled, but the spanning tree process consumes about 18% of the CPU.
IOS run: version 15.2 (4) E8.
------------------ show running-config ------------------
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
no spanning-tree vlan 1-4094
!
------------------ show spanning-tree ------------------
No spanning tree instance exists.
Would anyone have any ideas?
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