offset, eigrp...

from the horses mouth... ocg route pg 76

Offset Lists
EIGRP Offset Lists, the final tool for manipulating the EIGRP metrics listed in this chap-
ter, allow an engineer to simply add a value–an offset, if you will-to the calculated integer
metric for a given prefix. To do so, an engineer can create and enable an EIGRP Offset List
that defines the value to add to the metric, plus some rules regarding which routes should
be matched and therefore have the value added to their computed FD.
An Offset List can perform the following functions:
■ Match prefixes/prefix lengths using an IP ACL, so that the offset is applied only to
   routes matched by the ACL with a permit clause
■ Match the direction of the Update message, either sent (out) or received (in)
■ Match the interface on which the Update is sent or received
■ Set the integer metric added to the calculation for both the FD and RD calculations
   for the route
The configuration itself uses the following command in EIGRP configuration mode, in ad-
dition to any referenced IP ACLs:
offset-list {access-list-number | access-list-name} {in | out} offset [interface-
type interface-number]