I have a 2960X switch that has high CPU usage, I have checked the CPU processes and I see that the TTY Background process is using.
I provide information from show version, show cpu history and show process cpu sorted.
PERVENTSW01OUT#show processes cpu history
887888888788778887777888878888887889977877888888777778887777
331115522500990051199003352211226115599511000033288992241199
100 **
90 ** * ** *
80 ** ************** ********************* ****** *******
70 **********************************************************
60 **********************************************************
50 **********************************************************
40 **********************************************************
30 **********************************************************
20 **********************************************************
10 **********************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)
988888888888888888888888888888888888888888888888888888888888
545555755565455655465555655555546455455445456555556555556546
100 *
90 * ********** ***** ************ * ** ** * ***************
80 ##########################################################
70 ##########################################################
60 ##########################################################
50 ##########################################################
40 ##########################################################
30 ##########################################################
20 ##########################################################
10 ##########################################################
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
888888888888889888888888988888888888888888888888888998888888888888888888
979876677677781676877777177777769997679777777668677008779778797797679685
100
90 **********************************************************************
80 ######################################################################
70 ######################################################################
60 ######################################################################
50 ######################################################################
40 ######################################################################
30 ######################################################################
20 ######################################################################
10 ######################################################################
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
PERVENTSW01OUT#show version
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E7, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Wed 12-Jul-17 13:06 by prod_rel_team
ROM: Bootstrap program is C2960X boot loader
BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.2(3r)E1, RELEASE SOFTWARE (fc1)
PERVENTSW01OUT uptime is 2 years, 28 weeks, 2 hours, 30 minutes
System returned to ROM by power-on
System restarted at 14:04:12 PERU Wed Nov 23 2022
System image file is "flash:/c2960x-universalk9-mz.152-2.E7/c2960x-universalk9-mz.152-2.E7.bin"
Last reload reason: power-on
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
cisco WS-C2960X-48FPS-L (APM86XXX) processor (revision V0) with 524288K bytes of memory.
Processor board ID FJC2238W0JH
Last reset from power-on
8 Virtual Ethernet interfaces
1 FastEthernet interface
104 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:B1:E3:85:72:80
Motherboard assembly number : 73-16691-07
Power supply part number : 341-0527-03
Motherboard serial number : FJZ22370LEA
Power supply serial number : LIT2230399C
Model revision number : V0
Motherboard revision number : A0
Model number : WS-C2960X-48FPS-L
Daughterboard assembly number : 73-14200-03
Daughterboard serial number : FJZ223706P2
System serial number : FJC2238W0JH
Top Assembly Part Number : 68-100469-04
Top Assembly Revision Number : B0
Version ID : V07
CLEI Code Number : CMMZ100ARA
Daughterboard revision number : B0
Hardware Board Revision Number : 0x19
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C2960X-48FPS-L 15.2(2)E7 C2960X-UNIVERSALK9-M
2 52 WS-C2960X-48FPS-L 15.2(2)E7 C2960X-UNIVERSALK9-M
Switch 02
---------
Switch Uptime : 2 years, 28 weeks, 2 hours, 31 minutes
Base ethernet MAC Address : 70:0B:4F:D9:A3:00
Motherboard assembly number : 73-16691-07
Power supply part number : 341-0527-03
Motherboard serial number : FJZ22370LPH
Power supply serial number : LIT2230337A
Model revision number : V0
Motherboard revision number : A0
Model number : WS-C2960X-48FPS-L
Daughterboard assembly number : 73-14200-03
Daughterboard serial number : FJZ223706ST
System serial number : FJC2238W0PG
Top assembly part number : 68-100469-04
Top assembly revision number : B0
Version ID : V07
CLEI Code Number : CMMZ100ARA
Daughterboard revision number : B0
Configuration register is 0xF
| PERVENTSW01OUT#sh process cpu sorted |
| CPU utilization for five seconds: 80%/0%; one minute: 79%; five minutes: 79% |
| PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process |
| 51 2454984320 77687527 31601 55.42% 54.86% 54.67% 0 TTY Background |
| 161 3162245930 1949397712 1622 8.00% 8.08% 8.16% 0 Hulc LED Process |
| 392 2229806 9383620 237 0.63% 0.19% 0.18% 0 SNMP ENGINE |
| 390 3141759 18133355 173 0.47% 0.16% 0.15% 0 IP SNMP |
| 206 20449109 144962376 141 0.31% 0.65% 0.59% 0 IP Input |
| 172 294243411 15958233 18438 0.26% 0.31% 0.31% 0 HQM Stack Proces |
| 173 100295807 63832357 1571 0.15% 0.10% 0.10% 0 HRPC qos request |
| 131 202365757 78525209 2577 0.10% 0.12% 0.11% 0 hpm counter proc |
| 95 575520 39784541 14 0.10% 0.01% 0.00% 0 hrpc -> response |
| 48 11144044 92776820 120 0.10% 0.03% 0.02% 0 Net Background |
| 391 539419 9067190 59 0.05% 0.02% 0.00% 0 PDU DISPATCHER |
| 167 1117 1391 803 0.05% 0.02% 0.04% 1 SSH Process |
| 132 26418636 131525914 200 0.05% 0.03% 0.01% 0 HRPC pm-counters |
| 192 19757468 38904877 507 0.05% 0.04% 0.05% 0 CDP Protocol |
| 59 1442449 16095868 89 0.05% 0.02% 0.00% 0 Compute load avg |
| 219 50264857 136131751 369 0.05% 0.05% 0.05% 0 Spanning Tree |
| 16 215482 81108123 2 0.00% 0.00% 0.00% 0 ARP Background |
| 15 30089162 92816071 324 0.00% 0.00% 0.00% 0 ARP Input |
I have searched for information and apparently there is a bug, but it does not meet the requirements of the bug, let me know if anyone has any ideas on how to address the problem and solve the high CPU usage.
My config of line is:
no vstack
!
line con 0
line vty 5 15
!
