SRX

Hi,

I need to monitor CPU utilization on my SRX through SNMP. I found following KB Article (How to view the CPU utilization on J-series routers, KB11437) saying there are  routing-engine utilization and forwarding-engine utilization. Is it true for SRX also?, because I get both through SNMP.

What kind of utilization is showing through J-Web: "CPU Control" and "CPU data". Are these related to mentioned above utilizations ?

Hi ,

yes on SRX devices , you have Control Plane and Dataplane.

Control Plane CPU will go high when system Process ( deamon like jsrpd ,chassid ,iked etc) utilization goes high .

Dataplane CPU will go high when traffic rate reaches system capacity.

Control Plane CPU output:

root@Site-A> show chassis routing-engine

Routing Engine status:

Temperature 39 degrees C / 102 degrees F

CPU temperature 37 degrees C / 98 degrees F

Total memory 1024 MB Max 788 MB used ( 77 percent)

Control plane memory 560 MB Max 437 MB used ( 78 percent)

Data plane memory 464 MB Max 353 MB used ( 76 percent)

CPU utilization:

User 5 percent

Background 0 percent

Kernel 2 percent

Interrupt 0 percent

Idle 93 percent

Model RE-SRX240H

Serial ID AAAF7359

Start time 2013-05-25 03:19:33 UTC

Uptime 21 days, 3 hours, 17 minutes, 3 seconds

Last reboot reason 0x200:normal shutdown

Load averages: 1 minute 5 minute 15 minute

0.05 0.05 0.00

Dataplane Output

root@Site-A> show security monitoring fpc 0

FPC 0

PIC 0

CPU utilization : 0 %

Memory utilization : 76 %

Current flow session : 3

Current flow session IPv4: 3

Current flow session IPv6: 0

Max flow session : 65536

Total Session Creation Per Second (for last 96 seconds on average): 0

IPv4 Session Creation Per Second (for last 96 seconds on average): 0

IPv6 Session Creation Per Second (for last 96 seconds on average):

Following KB article explains about OIDs for both CPU Control and Dataplane:

http://kb.juniper.net/library/CUSTOMERSERVICE/GLOBAL_JTAC/BK26199/SRX%20SNMP%20Monitoring%20Guide_v1.1.pdf

 Regards,

rpatrthi

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Thanks rparthi for clarification. So, is this two (control plane and  data plane) somehow related or totally independent ?

I mean, is there such thing as "total cpu utilization" that is maybe sum of mentioned above utilizations ?

Hi jnsvano ,

Both Control and Dataplane are independent. there is no sum of these cpu's. They are not dependent.

Control Plane CPU going high will not cause any issues to dataplane traffic.

Traffic issue like latency and packet drops will happen only when dataplane CPU utilization reaches 100%.

Regards

rparthi

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