Offset-list

An offset-list is a mechanism used in distance vector routing protocols to increase metrics on incoming and outgoing routing protocol advertisements. EIGRP and RIP can both use offset-lists to modify metrics.

The syntax used for this command is the following:

**offset-list** {_access-list-number_ | _access-list-name_} {**in** | **out**} _offset_ [_interface-type interface-number_]

Any routes matching the access list will have their metrics increased by the value of offset. If the value is 0, no action is taken.

A value of 0 for the access-list-number indicates that all networks will be matched.

https://networklessons.com/cisco/ccie-enterprise-infrastructure/gre-tunnel-recursive-routing-error/