Eigrp Offset-list

An Eigrp offset-list modifies the feasible distance metric of EIGRP routes. It adds to the metric and this can be used to influence which route a router chooses.

Configuring an offset:

1: Create an acl to define which subnets the off-set list needs to be applied to. Note you don't need to create an access list if you want to modify all the subnets as you will see later below.

2: Apply the offset list under the router eigrp process.

ip access-list standard offset-list-filtering-add-10
permit 206.200.12.0 0.0.0.255
exit
!
Router eigrp 10
offset-list offset-list-filtering-add-10 in 10 fastEthernet 0/0
end
!


You can also configure offset-list 0 in 10 fastEthernet 0/0 and this applys to all routes and we did not have to create an access-list as we are using access-list 0.


Verification:

Offset-list of 10 Enabled.
R4#show ip eigrp topology 206.200.12.32 255.255.255.224
IP-EIGRP (AS 10): Topology entry for 206.200.12.32/27
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 409610
  Routing Descriptor Blocks:
  12.12.12.2 (FastEthernet0/0), from 12.12.12.2, Send flag is 0x0
      Composite metric is (409610/128266), Route is Internal
      Vector metric:
        Minimum bandwidth is 10000 Kbit
        Total delay is 6000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1


Offset-list of 10 Disabled.

R4#show ip eigrp topology 206.200.12.32 255.255.255.224
IP-EIGRP (AS 10): Topology entry for 206.200.12.32/27
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 409600  Routing Descriptor Blocks:
  12.12.12.2 (FastEthernet0/0), from 12.12.12.2, Send flag is 0x0
      Composite metric is (409600/128256), Route is Internal
      Vector metric:
        Minimum bandwidth is 10000 Kbit
        Total delay is 6000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1