Latency Pinging LAN Switch

Unanswered Question
May 22nd, 2008

I have 3*3750s Stacked switches in my LAN. When I ping other devices on the LAN, the ping time is < or = 1ms. However when I ping the switch itself, the ping time can go up to 25 ms. Please advice on what is happening.

I have this problem too.
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faithmugo Thu, 05/22/2008 - 21:37

Whe I do a Tracert, it shows that the switch is reached instantly and dirrectly.

glen.grant Thu, 05/22/2008 - 05:27

Ping response from a switch interface is put on low priority and is not a good way to test latency , always ping to a device hung off the switch itself .

johgill Thu, 05/22/2008 - 08:51

Agreed, ICMP is a low priority process. Maybe you have something else going on on this switch?


sh proc cpu

sh int | inc is up|drop

You may have the CPU chewing on some packets hitting the SW queues. See if you have drops or flushes in the software queues (L3 interfaces).


John Gill


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