Hi Group,
This is a re-post as I think the other got lost.
Apologies if it didn't.
I set up an IGRP lab recently to show unequal cost
load balancing, but came across the following problem
during the process.
I had 3 routers as the diameter and 2 loopback
interfaces configured on the 1st and 3rd routers,
advertised via the 'network' command.
What I found was that the composite metric (Bw + Dly)
from router 1 to router 3's loopback was higher than
what I expected (It was 500 units higher infact).
So, working backwards I realised that I couldn't alter
the Bw side of the equation i.e 10^7/1544 was the
minimum Bw along the path. So I had to introduce a
delay of 5000 usecs extra, such that when I scaled
down by 10 I had the 500 extra units that the Router
was displaying. This I concluded is therefore the
delay for virtual interfaces ?
It seems a little odd at first that the delay for a
virtual interface is 5 times larger than that of a
10Mbs-1 interface when you take serialisation delay
into consideration. However, CPU and memory must come
into play ?
Phil.
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