Command
Passive-Interface
Use
This command disables RIP for a specific interface on the router.
Syntax
Router(config-router)#passive-interface <interface>
Example
First, here are the route tables for all routers with no passive-interface default.
R2#conf t Enter configuration commands, one per line. End with CNTL/Z. R2(config)#router rip R2(config-router)#no passive-interface default
R1 route table.
R1(config-router)#do show ip route rip 2.0.0.0/32 is subnetted, 1 subnets R 2.2.2.2 [120/1] via 10.1.1.2, 00:00:15, FastEthernet0/0 R 3.0.0.0/8 [120/2] via 10.1.1.2, 00:00:15, FastEthernet0/0 10.0.0.0/24 is subnetted, 2 subnets R 10.2.2.0 [120/1] via 10.1.1.2, 00:00:15, FastEthernet0/0
R2 route table.
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, 00:00:12, FastEthernet0/0 R 1.3.3.3 [120/1] via 10.1.1.1, 00:00:12, FastEthernet0/0 R 1.2.2.2 [120/1] via 10.1.1.1, 00:00:12, FastEthernet0/0 R 3.0.0.0/8 [120/1] via 10.2.2.3, 00:00:21, FastEthernet1/0
R3 route table.
R3(config-router)#do show ip route rip 1.0.0.0/32 is subnetted, 3 subnets R 1.1.1.1 [120/2] via 10.2.2.2, 00:00:00, FastEthernet0/0 R 1.3.3.3 [120/2] via 10.2.2.2, 00:00:00, FastEthernet0/0 R 1.2.2.2 [120/2] via 10.2.2.2, 00:00:00, FastEthernet0/0 2.0.0.0/32 is subnetted, 1 subnets R 2.2.2.2 [120/1] via 10.2.2.2, 00:00:00, FastEthernet0/0 10.0.0.0/24 is subnetted, 2 subnets R 10.1.1.0 [120/1] via 10.2.2.2, 00:00:00, FastEthernet0/0
Next, we disable passive-interface for interface fa1/0 on R2.
R2(config-router)#passive-interface fa1/0
R1 route table. R2 still passes route information to R1 via fa0/0
R1(config-router)#do show ip route rip 2.0.0.0/32 is subnetted, 1 subnets R 2.2.2.2 [120/1] via 10.1.1.2, 00:00:11, FastEthernet0/0 R 3.0.0.0/8 [120/2] via 10.1.1.2, 00:00:11, FastEthernet0/0 10.0.0.0/24 is subnetted, 2 subnets R 10.2.2.0 [120/1] via 10.1.1.2, 00:00:11, FastEthernet0/0
R2 route table. This is unaffected because R2 is still receiving updates from R1 and R3.
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, 00:00:10, FastEthernet0/0 R 1.3.3.3 [120/1] via 10.1.1.1, 00:00:10, FastEthernet0/0 R 1.2.2.2 [120/1] via 10.1.1.1, 00:00:10, FastEthernet0/0 R 3.0.0.0/8 [120/1] via 10.2.2.3, 00:00:02, FastEthernet1/0
R3 route table. It is blank because R3 no longer receives updates through R2 via fa1/0
R3(config-router)#do show ip route ripR3(config-router)#