Latency Pinging LAN Switch

[faithmugo]

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.

[Ramprasad B]

use "pathping" AND TRACERT command check where packet is droping ..

[faithmugo]

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

[glen.grant]

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]

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

Check:

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).

Regards,

John Gill