HIGH CPU USAGE S6730

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Created: Jan 25, 2022 17:10:04Latest reply: Jan 26, 2022 07:11:19 219 6 0 0 0

Rewarded HiCoins： 0 (problem resolved)

Hi everyone!

I have a switch S6730 with high cpu usage and the output from display cpu-usage command is shown below:

CPU Usage Stat. Cycle: 60 (Second)
CPU Usage            : 85% Max: 87%
CPU Usage Stat. Time : 2022-01-25  14:02:33
CPU utilization for five seconds: 85%: one minute: 85%: five minutes: 85%
Max CPU Usage Stat. Time : 2022-01-25 10:37:39.

TaskName             CPU  Runtime(CPU Tick High/Tick Low)  Task Explanation
L2MO                 60%         0/75104300       L2MOD
OS                   20%         0/23c34600       Operation System
VIDL                 15%         0/1ad27480       DOPRA IDLE
SFPT                  2%         0/ 69db9c0       SFPT Timer
FMEA                  1%         0/ 3aa6a60       FMEA
IFPD                  1%         0/ 3d83120       IFPD Ifnet Product Adapter
link                  1%         0/ 4524320       linkscan
1AGA                  0%         0/       0       1AGAGT
AAA                   0%         0/       0       AAA  Authen Account Authorize
ACL                   0%         0/   7a120       ACL Access Control List
ADPT                  0%         0/       0       ADPT Adapter
AGNT                  0%         0/ 36d6160       AGNT SNMP agent task
AGT6                  0%         0/       0       AGT6 SNMP AGT6 task
ALM                   0%         0/       0       ALM  Alarm Management
ALS                   0%         0/       0       ALS  Loss of Signal
AM                    0%         0/  16e360       AM   Address Management
APP                   0%         0/       0       APP

I've done a search in documentation but I didn't find what is L2MOD yet. The high usage started at the same time as these logs occurred:

Jan 25 2022 10:31:42-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[2]:BFD session changed to Down. (SlotNumber=0, Discriminator=8323, Diagnostic=Receive AdminDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)
Jan 25 2022 10:30:48-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[3]:BFD session changed to Up. (SlotNumber=0, Discriminator=8327, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:30:42-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[4]:BFD session changed to Up. (SlotNumber=0, Discriminator=8326, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel23, ProcessPST=True)
Jan 25 2022 10:30:35-03:00 Core-SW101-Cachoeiro-ITPMR %IFNET/4/LINK_STATE(l)[5]:The line protocol IP on the interface Tunnel6 has entered the UP state.
Jan 25 2022 10:30:13-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[6]:BFD session changed to Up. (SlotNumber=0, Discriminator=8325, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel3, ProcessPST=True)
Jan 25 2022 10:30:07-03:00 Core-SW101-Cachoeiro-ITPMR %IFNET/4/LINK_STATE(l)[7]:The line protocol IP on the interface Tunnel8 has entered the UP state.
Jan 25 2022 10:29:19-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[8]:BFD session changed to Up. (SlotNumber=0, Discriminator=8324, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:29:15-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[9]:BFD session changed to Down. (SlotNumber=0, Discriminator=8322, Diagnostic=Receive AdminDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)
Jan 25 2022 10:29:14-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[10]:BFD session changed to Down. (SlotNumber=0, Discriminator=8309, Diagnostic=DetectDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)
Jan 25 2022 10:28:56-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[11]:BFD session changed to Up. (SlotNumber=0, Discriminator=8304, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:28:46-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[12]:BFD session changed to Up. (SlotNumber=0, Discriminator=8317, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:28:30-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[13]:BFD session changed to Up. (SlotNumber=0, Discriminator=8320, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel3, ProcessPST=True)
Jan 25 2022 10:28:24-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[14]:BFD session changed to Up. (SlotNumber=0, Discriminator=8321, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel23, ProcessPST=True)
Jan 25 2022 10:28:20-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[15]:BFD session changed to Up. (SlotNumber=0, Discriminator=8294, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel16, ProcessPST=True)
Jan 25 2022 10:28:20-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[16]:BFD session changed to Up. (SlotNumber=0, Discriminator=8319, FormerStatus=Init, Applications=LSPM | TE | L2VPN, BindInterfaceName=Tunnel100, ProcessPST=True)
Jan 25 2022 10:28:19-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[17]:BFD session changed to Up. (SlotNumber=0, Discriminator=8323, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:28:18-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TOUP(l)[18]:BFD session changed to Up. (SlotNumber=0, Discriminator=8322, FormerStatus=Down, Applications=LSPV, BindInterfaceName=None, ProcessPST=False)
Jan 25 2022 10:28:18-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[19]:BFD session changed to Down. (SlotNumber=0, Discriminator=8317, Diagnostic=NeighborDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)
Jan 25 2022 10:28:18-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[20]:BFD session changed to Down. (SlotNumber=0, Discriminator=8304, Diagnostic=NeighborDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)
Jan 25 2022 10:28:17-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[21]:BFD session changed to Down. (SlotNumber=0, Discriminator=8319, Diagnostic=DetectDown, Applications=LSPM | TE | L2VPN, ProcessPST=True, BindInterfaceName=Tunnel100, InterfacePhysicalState=Up, InterfaceProtocolState=Up)
Jan 25 2022 10:28:17-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[22]:BFD session changed to Down. (SlotNumber=0, Discriminator=8294, Diagnostic=DetectDown, Applications=LSPM | TE | L2VPN, ProcessPST=True, BindInterfaceName=Tunnel16, InterfacePhysicalState=Up, InterfaceProtocolState=Up)
Jan 25 2022 10:28:16-03:00 Core-SW101-Cachoeiro-ITPMR %IFNET/4/LINK_STATE(l)[23]:The line protocol IP on the interface Tunnel6 has entered the DOWN state.
Jan 25 2022 10:28:16-03:00 Core-SW101-Cachoeiro-ITPMR %IFNET/4/LINK_STATE(l)[24]:The line protocol IP on the interface Tunnel8 has entered the DOWN state.
Jan 25 2022 10:28:16-03:00 Core-SW101-Cachoeiro-ITPMR D/4/STACHG_TODWN(l)[25]:BFD session changed to Down. (SlotNumber=0, Discriminator=8305, Diagnostic=Receive AdminDown, Applications=LSPV, ProcessPST=False, BindInterfaceName=None, InterfacePhysicalState=None, InterfaceProtocolState=None)

Could someone help me please? The switch currently uses S6730 V200R019C10SPC500 software with patch version s6730-h-v200r019sph025

Regards!

High CPU Usage S6730-H

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from 4#

fuzi_yao Admin Created Jan 26, 2022 07:11:19

Hi, friend!

L2MO: MAC address learning task

This module is occupied when the chip learns MAC addresses. If the usage is too high, check whether a loop occurs or MAC address flapping occurs.As a result, the switch frequently learns MAC addresses.

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l2vc Created Jan 27, 2022 16:47:33 (0) (0)
Hi, @fuzi_yao !
The problem was MAC address flapping probably, but the relationship between it and BFD logs seems obscure for me as I didn't get any log about MAC addresses

fuzi_yao Reply l2vc Created Jan 28, 2022 05:09:40 (0) (0)
According to your logs, I do not find any alarm about MAC address flapping.You can view alarm information or diag logs for analysis.

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^2#

ariase88 Admin Created Jan 25, 2022 17:28:11

Thanks for contacting the Huawei Enterprise community,

We are checking your question and will provide an answer to you shortly...

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^3#

hemin88

Moderator Author Created Jan 25, 2022 19:27:54

Hi dear,

Please follow the below link from the section screenshot-ed:

https://support.huawei.com/enterprise/en/doc/EDOC1100088101

ssw

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l2vc Created Jan 25, 2022 20:24:36 (0) (0)
Hi! Thanks for your help but it didn't help me to find the real problem. Do you know what L2MOD means? In documentation I didn't find it

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^4#

fuzi_yao Admin Created Jan 26, 2022 07:11:19

Hi, friend!

L2MO: MAC address learning task

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fuzi_yao Reply l2vc Created Jan 28, 2022 05:09:40 (0) (0)
According to your logs, I do not find any alarm about MAC address flapping.You can view alarm information or diag logs for analysis.

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