Network Requirements
- RIPv2 runs between Device1 and Device2 for route interaction.
- Device1 learns two routes 2.0.0.0/24 and 3.0.0.0/24 that have been advertised by Device2, and then it filters route 3.0.0.0/24 in the advertisement direction of Device2.
Network Topology
![Networking for Configuring RIP Route Filtration](/storage/images/Document/Maipu/unicast-routing/config-rip-route-filtration.jpg)
Figure 5-4 Networking for Configuring RIP Route Filtration
Configuration Steps
Step 1: Create VLANs, and add ports to the required VLANs. (Omitted)
Step 2: Configure IP addresses for the ports. (Omitted)
Step 3: Configure RIP.
#Configure Device1.
Device1#configure terminal
Device1(config)#router rip
Device1(config-rip)#version 2
Device1(config-rip)#network 1.0.0.0
Device1(config-rip)#exit
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#Configure Device2.
Device2#configure terminal
Device2(config)#router rip
Device2(config-rip)#version 2
Device2(config-rip)#network 1.0.0.0
Device2(config-rip)#network 2.0.0.0
Device2(config-rip)#network 3.0.0.0
Device2(config-rip)#exit
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#Query the routing table of Device1.
Device1#show ip route
Codes: C - Connected, L - Local, S - static, R - RIP, B - BGP, i-ISIS
U - Per-user Static route
O - OSPF, OE-OSPF External, M - Management, E - IRMP, EX - IRMP external
C 1.0.0.0/24 is directly connected, 00:23:06, vlan2
R 2.0.0.0/24 [120/1] via 1.0.0.2, 00:13:26, vlan2
R 3.0.0.0/24 [120/1] via 1.0.0.2, 00:13:26, vlan2
C 127.0.0.0/8 is directly connected, 76:51:00, lo0
According to the routing table, Device1 has learnt two routes advertised by Device2.
Step 4: Configure the ACL.
#Configure Device2.
Device2(config)#ip access-list standard 1
Device2(config-std-nacl)#permit 2.0.0.0 0.0.0.255
Device2(config-std-nacl)#commit
Device2(config-std-nacl)#exit
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![note](/storage/images/Document/Maipu/note-icon.jpg)
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In configuring route filtration, you can create a filtration rule based on a prefix list or ACL. The prefix list can precisely match routing masks while the ACL cannot match routing masks.
Step 5: Configure route filtration.
#Configure route filtration in the output direction of interface VLAN2 of Device2.
Device2(config)#router rip
Device2(config-rip)#distribute-list 1 out vlan2
Device2(config-rip)#exit
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Step 6: Check the result.
#Query the routing table of Device1.
Device1#show ip route
Codes: C - Connected, L - Local, S - static, R - RIP, B - BGP, i-ISIS
U - Per-user Static route
O - OSPF, OE-OSPF External, M - Management, E - IRMP, EX - IRMP external
C 1.0.0.0/24 is directly connected, 00:23:06, vlan2
R 2.0.0.0/24 [120/1] via 1.0.0.2, 00:13:26, vlan2
C 127.0.0.0/8 is directly connected, 76:51:00, lo0
According to the routing table, Device2 does not advertise route 3.0.0.0/24 to Device1, but the route is deleted from the routing table of Device only after the route times out.
![note](/storage/images/Document/Maipu/note-icon.jpg)
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The distribute-list can be applied to all interfaces or a specified interface, and it can be used in both the receive and advertisement directions.