High latency with strange patrol

Unanswered Question
Apr 20th, 2010

Dear experts

I have several AP´s working with WLC 4400 series. The workstation with Cisco PCI wifi cards detect high latency when I ping several servers. It´s strange because always is the same patrol of high latency. Each 20 sec 3 peaks of high latency in all workstation in differents areas. below sample. I wired connected the workstation and I don´t get high latency, only on wireless


Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=100ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=18ms TTL=126
Reply from 10.137.221.22: bytes=32 time=111ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=34ms TTL=126
Reply from 10.137.221.22: bytes=32 time=127ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126

I add that the ping is from worstation connected with wireless to other server connected to other SW. There are not firewall.in the middle just 2 routers with HRSP

I also launch ping to other server in the same network with the same high latency

Model of AP  AIR-LAP1242AG-E-K9 with 2.4 Ghz

I ping from Cisco SW to server and I get normal latency

Thanks in advanced

I have this problem too.
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Ganesh Hariharan Wed, 04/28/2010 - 03:26

Dear experts

I have several AP´s working with WLC 4400 series. The workstation with Cisco PCI wifi cards detect high latency when I ping several servers. It´s strange because always is the same patrol of high latency. Each 20 sec 3 peaks of high latency in all workstation in differents areas. below sample. I wired connected the workstation and I don´t get high latency, only on wireless


Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=100ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=18ms TTL=126
Reply from 10.137.221.22: bytes=32 time=111ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time=34ms TTL=126
Reply from 10.137.221.22: bytes=32 time=127ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126
Reply from 10.137.221.22: bytes=32 time<1ms TTL=126

I add that the ping is from worstation connected with wireless to other server connected to other SW. There are not firewall.in the middle just 2 routers with HRSP

I also launch ping to other server in the same network with the same high latency

Model of AP  AIR-LAP1242AG-E-K9 with 2.4 Ghz

I ping from Cisco SW to server and I get normal latency

Thanks in advanced

Hi,

With the observation whihc you have told that means some where in the network one of the device is having high utilization that why all are getting same behavior at same time.Have you checked the CPU or logs in AP which are serving for network connectivity for users.

HTH

Ganesh.H

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