EIGRP Filtering (Prefix List)
On the last post, we learn about EIGRP Filtering with Distribute List. Now we will continue our material about EIGRP Filtering but with Prefix List. EIGRP Filtering with prefix list has a function to filter some network with various prefix so that not listened in routing table a router. Example we have a topology are consist three routers. The Topology same as a picture below.
The scenario is we will filter the network with various prefix on R3 to not listened in routing table on R1. For the IoS of router, you can download at previous post.
For the first make an IP Address for interface which Connecting fellow router and for loopback interface in each router with various prefix.
R1:
R1(config)#int fa0/0R2:
R1(config-if)#ip add 12.12.12.1 255.255.255.0
R1(config-if)#int lo0
R1(config-if)#ip add 10.10.10.1 255.255.255.192
R1(config-if)#int lo1
R1(config-if)#ip add 10.10.10.65 255.255.255.224
R1(config-if)#int lo2
R1(config-if)#ip add 10.10.10.97 255.255.255.240
R1(config-if)#int lo3
R1(config-if)#ip add 10.10.10.113 255.255.255.248
R1(config-if)#int lo4
R1(config-if)#ip add 10.10.10.121 255.255.255.252
R2(config)#int fa0/0R3:
R2(config-if)#ip add 12.12.12.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int fa0/1
R2(config-if)#ip add 23.23.23.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int lo0
R2(config-if)#ip add 20.20.20.1 255.255.255.192
R2(config-if)#int lo1
R2(config-if)#ip add 20.20.20.65 255.255.255.224
R2(config-if)#int lo2
R2(config-if)#ip add 20.20.20.97 255.255.255.240
R2(config-if)#int lo3
R2(config-if)#ip add 20.20.20.113 255.255.255.248
R2(config-if)#int lo4
R2(config-if)#ip add 20.20.20.121 255.255.255.252
R3(config)#int fa0/0
R3(config-if)#ip add 23.23.23.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#int lo0
R3(config-if)#ip add 30.30.30.1 255.255.255.192
R3(config-if)#int lo1
R3(config-if)#ip add 30.30.30.65 255.255.255.224
R3(config-if)#int lo2
R3(config-if)#ip add 30.30.30.97 255.255.255.240
R3(config-if)#int lo3
R3(config-if)#ip add 30.30.30.113 255.255.255.248
R3(config-if)#int lo4
R3(config-if)#ip add 30.30.30.121 255.255.255.252
After we configuring IP address for each router, now we will filter all network on loopback interface in R3 with Prefix List. Configure the list of prefix will be filter at R1.
R1(config)#ip prefix-list filter seq 10 deny 30.30.30.0/24 le 30
R1(config)#ip prefix-list filter seq 20 permit 0.0.0.0/0 le 32
Command "ip prefix-list" has a function to make a list of prefix will be filter. "filter" is just ID for list of prefix have been made. "seq 10" it's just a number like in access list. "30.30.30.0/24 le 30" we make a list of prefix will be filter network on loopback interface with prefix range from prefix /24 until /30.
R1:
R1(config)#router eigrp 1After this we can verifying by looking routing table on R1.
R1(config-router)#distribute-list prefix filter in
On picture above, network loopback interface on R3 with range from 30.30.30.0/24 until 30.30.30.0/30 aren't listened in routing table on R1. so the configuration is succeeded.
Alright I think this enough, see you at next post. At next post we still exploring about routing protocol EIGRP. So, still stay at this blog.
And See you next Time.
Greetings, Networkers
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