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How the can i identify the link delay?

i want to compute the link delay,how can i do it ?Just by using ping command?

And when i use "show interface" command,i find that

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,and i want to know how the router know the DLY is 20000usec?


Re: How the can i identify the link delay?

Delay itself is an integer that specifies the delay in tens of microseconds for an interface or network segment. It can be 0 or any positive number that is a multiple of 39.1 nanoseconds. It is also a static figure and not measured dynamically. It is usually presented (eg show interface, sh ip route, show ip eigrp top x.x.x.x) in microseconds.

The default delay of an interface depends on the interface itself (ie the time it takes to place a packet on the wire, called serialization):


fastethernet - 100 microsec. (interface "delay" command = 10)

HSSI - 20000 microsec (delay command = 2000)

16Mb Token ring - 630 microsec (delay command =63)

ethernet - 1000 microsec (delay command = 100)

T1 - 20000 microsec (delay command =2000)

64kb - 20000 microsec (delay command =2000)

As a side note, if you are going to influence EIGRP metrics, do it with the delay command and not bandwidth, as bandwidth will affect other protocols as well (eg OSPF).

Hope it helps.


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