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Procurve2524 CPU utilization problem

LQrincz Zoltán
Occasional Visitor

Procurve2524 CPU utilization problem

I unpack my HP Procurve 2524 switch and just turn on. I checked from console(I did'nt use any other ethernet ports and modules) the boot process and I see the switch boot up well, but when I check the 'Status and Counters' and the 'General System Information' the CPU Utilization show me 93%. I don't know why?! The switch's fimware version is: 04.08. After 20 minutes the CPU utilization go down to 10%. In this period I don't use the switch. Somebody can answer why is high the CPU utilization after boot for 20 minutes. Thanks.
9 REPLIES
Ron Kinner
Honored Contributor

Re: Procurve2524 CPU utilization problem

Latest firmware on 2524 is F.05.17 so I suggest you upgrade and then see if you still have the problem. See:

http://www.hp.com/rnd/software/switches.htm

Ron
LQrincz Zoltán
Occasional Visitor

Re: Procurve2524 CPU utilization problem

After the os upgrade to F_05_17 the CPU utilization go down to 90%. Not resolve the problem.
Ron Kinner
Honored Contributor

Re: Procurve2524 CPU utilization problem

When the switch boots up it will try to find a DHCP/BOOTP server to get its management IP from. Have you tried setting the management IP? That should not be a big CPU user but you never know.

Ron
LQrincz Zoltán
Occasional Visitor

Re: Procurve2524 CPU utilization problem

On the IP configuration menu the IP config [DHCP/Bootp] is Disbaled. I have no idea why is working the CPU. Maybe the displaying is wrong.
Luis Carrillo_1
Occasional Visitor

Re: Procurve2524 CPU utilization problem

I have seen this on many of the 2524s we have. After a few hours they mellow out and only go down to about 50%. I do not trust the value, no customers are complaining. Seeing 99% almost made me take it out the first time I saw it.
Do all of them stay at 90%? if so I would take off nodes one by one until you find the one doing it.
If that doesnâ t work call support.

Good lu
keep it symple
garrigues
Occasional Visitor

Re: Procurve2524 CPU utilization problem

hi,

I just noticed that the same problem occurs on my 2524's. When I launch a big file transfer after a boot, CPU utilization rise from 90% to 99% and my telnet session is very slow. After the transfer, CPU utilization 'fall' to 90-92% until sysuptime is about 20mn (+/-5mn), then CPU suddenly get its 'normal' activity : 10-40%.

Upgrading from F.05.17 to F.05.22 firmware did not fix the problem.
Here are 2 config files used for my tests.
As you can see, access to DHCP isn't enabled, LACP and CDP are deactivated and i use VLANs;
ROM version is F.02.01, and these switches are connected to my network during my tests :


; J4813A Configuration Editor; Created on release #F.05.17

hostname "hp10"
snmp-server contact "Y/S"
snmp-server location "SR0"
time timezone 60
time daylight-time-rule Western-Europe
no cdp run
interface 1
no lacp
exit

(...)

interface 25
disable
exit
interface 26
disable
exit
ip default-gateway xxx.xxx.xxx.1
timesync sntp
sntp broadcast
snmp-server community "xxxxxxxx"
snmp-server community "xxxxxxx" Unrestricted
snmp-server host xxx.xxx.xxx.157 "public" All
vlan 1
name "DEFAULT_VLAN"
no ip address
no untagged 1-26
exit
vlan 96
name "INFO"
untagged 2-6,8-26
tagged 1,7
exit
vlan 2
name "ADMIN"
ip address xxx.xxx.xxx.80 255.255.255.128
tagged 1,7
exit
stack join 001083xxxxxx
no aaa port-access authenticator active
password manager
password operator

---------------------------------
; J4813A Configuration Editor; Created on release #F.05.22

hostname "hp3"
snmp-server contact "Y/S"
snmp-server location "RG"
time timezone 60
time daylight-time-rule Middle-Europe-and-Portugal
no cdp run
interface 1
no lacp
exit
interface 2
speed-duplex auto-10
no lacp
exit
interface 3
speed-duplex auto-10
no lacp
exit

(...)

interface 7
no lacp
exit
interface 8
speed-duplex auto-10
no lacp
exit

(...)

interface 25
no lacp
exit
interface 26
no lacp
exit
ip default-gateway xxx.xxx.xxx.1
timesync sntp
sntp broadcast
snmp-server community "xxxxxxxx"
snmp-server community "xxxxxxx" Unrestricted
snmp-server host xxx.xxx.xx.157 "public" All
vlan 1
name "DEFAULT_VLAN"
no ip address
no untagged 1-26
exit
vlan 96
name "INFO"
untagged 2-6,8-26
tagged 1,7
exit
vlan 2
name "ADMIN"
ip address xxx.xxx.xxx.13 255.255.255.128
tagged 1,7
exit
stack join 001083xxxxxx
primary-vlan 2
no aaa port-access authenticator active
password manager
password operator
----------------------------------

My others 2524 are in use and i cannot use them for testing purposes.

Do you know if this behavior noticeable for all the 2524 switches, and is it possible to fix this problem ?

Thanks !

sylvain;
SCOOTER
Esteemed Contributor

Re: Procurve2524 CPU utilization problem

Sylvian,

This is normal behavior for the switch. Just wait about 15 min. after reloading the switch.

Regards,

SCOOTER
Ardon
Trusted Contributor

Re: Procurve2524 CPU utilization problem

Hi,

The reason why the CPU load is high during the first 20 min or so on a 2524 is normal as the CPU uses all idle cycles to generate SSH Session Keys (yes even if you are not using SSH). This is a trade off. Either generate them when an SSH connection is needed (long connection time a the Session Key has to be generated still) or generate them when there are idle CPU cycles anyways. HP decided for the latter.

Regards, Ardon
ProCurve Networking Engineer
OLARU Dan
Trusted Contributor

Re: Procurve2524 CPU utilization problem

@Ardon

This cleared the air. What if I don't need SSH but use telnet instead? Can I disable the SSH stuff?