Delay

[bellocarico]

Now, this may seems a trivial question, but I'm very confused on this point.

What's the delay?

When I studied QoS I read about serialization delay, switch delay, Queuing-buffering delay and de-jitter delay.

Doing a show interface ser 0

I get a DLY value which is costant (I guess calculated on the port speed).

Somewhere in Internet I've found a table with different delay values based on the frame size.

So, is the delay a fix or variable value?

If it's variable, wha't the SNMP "delay" value I get on the router/switch interface?

If it's still true that the delay is variable, how can a port calculate it?

I'm just so confused on this, could you please shade light on this for me?

Thanks a lot!

[Richard Burts]

Stefano

As you point out there are actually several different types of delay. The delay that you see on an interface represents serialization delay. It is not calculated by the interface and it is not variable. It is a fixed value depending on the type of interface. Cisco has a default value for delay based on the type of interface. It is a configuration option within interfaces to change the delay value if there is some reason that you might want to.

HTH

Rick