Ping round trip delay expalnation

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Jan 14th, 2009
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Is there any explanation why IOS has this large round trip delay? Any URL explain this will be appreciated.


round-trip min/avg/max = 1/2/4 ms


Example:

Router#ping 10.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms


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anthonyp@tc.com.au Wed, 01/14/2009 - 17:34
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Hi,


In order to understand your question a little better, is 10.1.1.1 a local IP address or is it external to the router. Additionally, what functions are being performed by the router at the time in case this is caused by the router reaching 100% capability.

Mark Yeates Wed, 01/14/2009 - 17:41
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Ben,


I would say these are very normal ping response times. From your output The longest time was 4 milliseconds, and the shortest was one millisecond with and average of two.


Usually if there is no ARP entry in the router the router will have to send an ARP query for the destination. That would likely account for the 4ms ping.


Here's a link that goes into greater detail about ping.


http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00800a6057.shtml#ping_com


HTH,

Mark

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