How offset-list works in EIGRP?

From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Wed Aug 15 2007 - 13:16:06 ART

Hi All,

Does anyone know exactly how offset-list works in EIGRP?

If a router (say, R1) applies an offset-list outbound on an interface (e.g.
"offset-list 0 out 100 Fas0/0") to a downstream neighbor (say, R2), I
observed the composite metric, FD/AD, etc of R1's routes remain unchanged.
R2 receives routes from R1 with an increase of 100 in their composite
metrics. Checking R2's topology table, the total delay value of each route
it learned from R1 is slightly increased.

What I can deduce is, because of the offset list R1 has to assume an
increased composite metric of its routes. To compensate for the increase, it
has to calculate a new cumulative delay value to be sent to R2 such that R2
can compute a composite metric (FD/AD) with an increase of 100.

Any comments are most welcome.

Thank you.

B.Rgds,
Lim TS

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