思科3850 CPU很高

[tianwen]

CPU总的占用率如下：其中有两个进程占用率很高，请问stack-mgr是个什么进程？
C3850Core# sho processes cpu sorted | exclude 0.0
Core 0: CPU utilization for five seconds: 54%; one minute: 58%; five minutes: 57%
Core 1: CPU utilization for five seconds: 96%; one minute: 77%; five minutes: 76%
Core 2: CPU utilization for five seconds: 98%; one minute: 95%; five minutes: 86%
Core 3: CPU utilization for five seconds: 94%; one minute: 77%; five minutes: 80%
Core 4: CPU utilization for five seconds: 60%; one minute: 90%; five minutes: 89%
Core 5: CPU utilization for five seconds: 70%; one minute: 64%; five minutes: 73%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
6290 2553257 40729575 257 36.18 35.78 35.71 1088 fed
6292 3188910 12207160 552 32.59 32.77 32.81 0 stack-mgr
12891 3166792 20478296 262 5.85 7.12 7.35 34816 iosd
6894 643440 41850548 15 2.45 0.21 0.19 0 cli_agent
6878 3475554 18636262 133 0.19 0.13 0.17 0 ffm
C3850Core# sho processes cpu detailed process stack-mgr sorted | ex 0.0
Core 0: CPU utilization for five seconds: 64%; one minute: 60%; five minutes: 57%
Core 1: CPU utilization for five seconds: 96%; one minute: 86%; five minutes: 79%
Core 2: CPU utilization for five seconds: 93%; one minute: 93%; five minutes: 87%
Core 3: CPU utilization for five seconds: 55%; one minute: 76%; five minutes: 80%
Core 4: CPU utilization for five seconds: 97%; one minute: 90%; five minutes: 89%
Core 5: CPU utilization for five seconds: 55%; one minute: 54%; five minutes: 69%
PID T C TID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
(%) (%) (%)
6292 L 1 6760 362832 1195972 0 15.77 15.90 15.93 0 Replenish OOB
6292 L 2 6761 4139670 4274747 0 15.48 15.68 15.68 0 OOBnd RX
6292 L 0 6757 2652355 3232603 0 0.73 0.81 0.88 0 IntrDrv
6292 L 0 6762 3530552 3985732 0 0.19 0.18 0.18 0 OOBnd TX
XH-C3850Core-241# sho processes cpu detailed process fed sorted | ex 0.0
Core 0: CPU utilization for five seconds: 57%; one minute: 54%; five minutes: 56%
Core 1: CPU utilization for five seconds: 93%; one minute: 93%; five minutes: 83%
Core 2: CPU utilization for five seconds: 73%; one minute: 85%; five minutes: 85%
Core 3: CPU utilization for five seconds: 78%; one minute: 68%; five minutes: 77%
Core 4: CPU utilization for five seconds: 56%; one minute: 86%; five minutes: 89%
Core 5: CPU utilization for five seconds: 98%; one minute: 72%; five minutes: 70%
PID T C TID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
(%) (%) (%)
6290 L 2799237 4073442 257 35.82 35.83 35.74 1088 fed
6290 L 5 13634 3724791 9379346 0 16.05 15.97 15.94 0 PunjectRx
6290 L 0 6737 2002953 1487531 0 15.73 15.58 15.53 0 fed-ots-main
6290 L 2 13635 2008984 1778054 0 1.31 1.66 1.59 0 PunjectTx
6290 L 4 6733 1035179 3092282 0 1.25 0.99 1.03 1088 CMI default xdm
6290 L 2 6766 1802631 3163667 0 0.61 0.58 0.57 0 IntrDrv
6290 L 2 11361 3887857 2427307 0 0.32 0.48 0.49 0 Xcvr
6290 L 4 6740 1676603 3734823 0 0.29 0.27 0.26 0 fed-ots-nfl
请大神指点，在线等，急！！！！！！！！！！

[wuleihen · Accepted solution]

fed and stack-mgr causing High CPU on 3850
CSCuo14511
Description
Symptom:
"show process cpu" reports high CPU utilization due to 'stack-mgr' process (which consumes >75%).
Conditions:
Excessive mac-address flapping
OR
Aggressive mac-aging timer configuration - <= 15 seconds
OR
Spanning-tree Topology Change Notification (TCN) due to frequent layer1/2 events and/or spanning-tree misconfiguration in the network
Workaround:
Eliminate the conditions mentioned above and/or update the configurations (to stop aggressive mac aging and frequent STP TCNs).
Further Problem Description:
This defect is closed as it is an expected behavior for the stack-mgr process to consume more CPU cycles when there is excessive mac flaps.

[wuleihen]

Last Modified:May 16,2018
Status:Terminated
Severity:2 Severe
Product: (1)
Cisco Catalyst 3850 Series Switches
Support Cases:363
Known Affected Releases: (1)
15.0(1)EZ
Known Fixed Releases: (0)
No release planned to fix this bug

[tianwen]

wuleihen 发表于 2018-5-22 10:18
fed and stack-mgr causing High CPU on 3850
CSCuo14511
Description

1.确实存在mac-address flapping的情况
2. mac-aging >15 seconds
3.没有频繁的TCN报文
按大神回答，应该是mac-address flapping导致的了，但由于现网的架构是这样，mac-address flapping情况属于正常，有没有可以不改变现网的架构降低CPU的方法呢？
请问大神的资料在哪里找的？我上网找来找去都没有相关的资料

[tianwen]

wuleihen 发表于 2018-5-22 10:18
fed and stack-mgr causing High CPU on 3850
CSCuo14511
Description

Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
A - formed by Auto LAG
51 Po51(SD) PAgP Te1/0/1(I) Te1/0/2(I)
61 Po61(SD) PAgP Te1/0/3(I) Te1/0/4(I)
71 Po71(SD) PAgP Te1/0/5(I) Te1/0/6(I)
81 Po81(SD) PAgP Te1/0/7(I) Te1/0/8(I)
mac-address flapping是出现在聚合口里，
Host 0050.568f.0952 in vlan 2 is flapping between port Te1/0/2 and port Te1/0/1
聚合口的成员端口是stand-alone。。。