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ISIS process Utilization reached 100%

Sunil_06
Level 1
Level 1

hi Team, 

is there any way to restart isis process in IOS ? 

i have tried to clear the clns neighbor but no luck . 

ISIS sequence number has been reached maximum "0xFFFFFFFF"

Router-1#show processes cpu sorted
CPU utilization for five seconds: 99%/0%; one minute: 99%; five minutes: 99%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
352 3982241876 811511454 4907 99.03% 98.87% 98.62% 0 ISIS Upd dcn
90 23318692 209210093 111 0.16% 0.11% 0.10% 0 Per-Second Job


Router-1#show version
Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.4(3)M5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 09-Feb-16 05:48 by prod_rel_team


Router-1#show isi database Router-1.2B-00 verbose

Tag dcn:

IS-IS Level-1 LSP Router-1.2B-00
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
Router-1.2B-00 * 0xFFFFFFFF 0x6443 0 0/0/0
Metric: 0 IS Router-1.00
Metric: 0 ES 0000.0020.6883

IS-IS Level-2 LSP Router-1.2B-00
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
Router-1.2B-00 * 0x00000000 0x0000 0 0/0/0
Router-1#

 

Dec 19 16:32:31.102: %CLNS-4-LSP_MAXSEQ: ISIS: attempt to exceed LSP maximum sequence number for LSP Router-1.2B-00
Dec 19 16:33:01.103: %CLNS-4-LSP_MAXSEQ: ISIS: attempt to exceed LSP maximum sequence number for LSP Router-1.2B-00
Dec 19 16:33:31.103: %CLNS-4-LSP_MAXSEQ: ISIS: attempt to exceed LSP maximum sequence number for LSP Router-1.2B-00
Dec 19 16:34:01.103: %CLNS-4-LSP_MAXSEQ: ISIS: attempt to exceed LSP maximum sequence number for LSP Router-1.2B-00

 

 

 

BR://

SK

5 Replies 5

@Sunil_06 

 Did you use this command?

clear isis lsp-full

Hi Flavio , 

i have already tried but no luck 

 

BR://

SK

M02@rt37
VIP
VIP

Hello @Sunil_06 

You can try the following to reset IS-IS neighbors and databases:
clear isis *
clear clns neighbor

This may help refresh the IS-IS state without restarting the entire process.

From my point of view, the issue arises because the IS-IS LSP sequence number reached the maximum value (0xFFFFFFFF). To prevent this you can reduce the LSP generation frequency using the times lsp command. Also, ensure there are no network or configuration issues causing excessive LSP flooding...

If the CPU remains high after resetting the IS-IS process, further investigation into your configuration and network topology may be required.

Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.

Both commands i have tried but still its showing same 

Sunil_06
Level 1
Level 1

no fluctuation showing in LSP/SPF logs 

Router-1#show isis lsp
Tag dcn:

Level 1 LSP log
When Count Interface Triggers
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 3 GigabitEthernet0/2.46 DELADJ DIS
4y41w 2 GigabitEthernet0/2.30 DELADJ DIS
4y41w 2 GigabitEthernet0/2.30 NEWADJ DIS
4y41w 2 GigabitEthernet0/2.98 DELADJ DIS
4y41w 2 GigabitEthernet0/2.98 NEWADJ DIS
4y41w 2 GigabitEthernet0/2.98 DELADJ DIS
4y41w 2 GigabitEthernet0/2.98 NEWADJ DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 2 GigabitEthernet0/2.30 DELADJ DIS
4y41w 4 GigabitEthernet0/2.30 NEWADJ DELADJ DIS
4y41w 2 GigabitEthernet0/2.98 NEWADJ DIS
4y41w 2 GigabitEthernet0/2.98 DELADJ DIS
4y41w 2 GigabitEthernet0/2.98 NEWADJ DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 12 GigabitEthernet0/2.98 NEWADJ DELADJ DIS
(pending) 255912 GigabitEthernet0/2.98 CLEAR IFDOWN NEWADJ DELADJ DELADJ DIS ES

Level 2 LSP log
When Count Interface Triggers
4y41w 2 GigabitEthernet0/2.30 NEWADJ DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.30 DELADJ
4y41w 2 GigabitEthernet0/2.30 NEWADJ DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.98 DIS
4y41w 1 GigabitEthernet0/2.30 DELADJ
4y41w 2 GigabitEthernet0/2.30 NEWADJ DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DIS
4y41w 1 GigabitEthernet0/2.30 DELADJ
4y41w 2 GigabitEthernet0/2.30 NEWADJ DIS
4y41w 12 GigabitEthernet0/2.98 NEWADJ DELADJ DIS
(pending) 162457 GigabitEthernet0/2.30 CLEAR IFDOWN NEWADJ DELADJ DELADJ DIS

Router-1#

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