Offset-List Command on CISCO Router/Switch

Command

Offset-List

Use

This command allows you to modify the metric of a route on the routing table.

Syntax

Router(config-router)#offset-list <list> <in or out> <offset> <interface>

Options

<list> = 0 All networks
<list> = 1-99, 1300 – 1999 Standard accses list
<list> = Name Named access list
<in> Affects inbound updates
<out> Affects outbound updates
<offset> = 1 – 16 Amount to modify metric
<interface> Only affects updates comming through this interface

Example

Here is the route table for R2 table before configuring the offset list.

R2(config-router)#do show ip route rip
1.0.0.0/32 is subnetted, 3 subnets
R 1.1.1.1 [120/1] via 10.1.1.1, 00:00:19, FastEthernet0/0
R 1.3.3.3 [120/1] via 10.1.1.1, 00:00:19, FastEthernet0/0
R 1.2.2.2 [120/1] via 10.1.1.1, 00:00:19, FastEthernet0/0
R 3.0.0.0/8 [120/1] via 10.2.2.3, 00:00:25, FastEthernet1/0

Here is the route table for R2 after setting the offset list for fa0/0 to 5.

R2(config-router)#offset-list 0 in 5 fa0/0
R2(config-router)#do show ip route rip
1.0.0.0/32 is subnetted, 3 subnets
R 1.1.1.1 [120/6] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 1.3.3.3 [120/6] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 1.2.2.2 [120/6] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 3.0.0.0/8 [120/1] via 10.2.2.3, 00:00:12, FastEthernet1/0

Finally, here is the route table for R2 after setting the offset list to 7 for 1.3.3.3.

R2(config)#access-list 25 permit 1.3.3.3
R2(config)#router rip
R2(config-router)#offset-list 25 in 7 R2(config-router)#do show ip route rip
1.0.0.0/32 is subnetted, 3 subnets
R 1.1.1.1 [120/1] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 1.3.3.3 [120/8] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 1.2.2.2 [120/1] via 10.1.1.1, 00:00:09, FastEthernet0/0
R 3.0.0.0/8 [120/1] via 10.2.2.3, 00:00:12, FastEthernet1/0

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