In this example we are filtering from R2 the subnet 2.2.5.0/24
R1(config)#access-list 5 permit 2.2.5.0 ?
A.B.C.D Wildcard bits
log Log matches against this entry
<cr>
R1(config)#access-list 5 permit 2.2.5.0 0.0.0.255 ?
log Log matches against this entry
<cr>
R1(config)#access-list 5 permit 2.2.5.0 0.0.0.255 log
R1(config)#router rip
R1(config-router)#dist
R1(config-router)#distance 255 0.0.0.0 255.255.255.255 ?
<1-99> IP Standard access list number
<1300-1999> IP Standard expanded access list number
WORD Standard access-list name
<cr>
R1(config-router)#distance 255 0.0.0.0 255.255.255.255 5
R1(config-router)#do clear ip route *
R1(config-router)#
*Mar 2 00:57:26.809: %SEC-6-IPACCESSLOGNP: list 5 permitted 0 2.2.5.0 -> 0.0.0.0, 1 packet
R1(config-router)#do sh ip route 2.0.0.0
Routing entry for 2.0.0.0/24, 3 known subnets
Redistributing via rip
R 2.2.4.0 [120/1] via 12.1.1.2, 00:00:14, Serial0/0
R 2.2.6.0 [120/3] via 14.1.1.2, 00:00:18, Serial0/1
R 2.2.7.0 [120/1] via 12.1.1.2, 00:00:14, Serial0/0
R1(config-router)#
Another example
we have two paths to arrive to a destination in subnet 4.4.12.and 4.4.15 starting from R2 we wnat to make one path primary ,and filter the second one
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
R 34.1.1.0 [120/1] via 23.1.1.2, 00:00:29, Serial0/1
1.0.0.0/24 is subnetted, 4 subnets
R 1.1.0.0 [120/1] via 12.1.1.1, 00:00:08, Serial0/0
R 1.1.1.0 [120/1] via 12.1.1.1, 00:00:08, Serial0/0
R 1.1.2.0 [120/1] via 12.1.1.1, 00:00:08, Serial0/0
R 1.1.3.0 [120/1] via 12.1.1.1, 00:00:08, Serial0/0
2.0.0.0/24 is subnetted, 4 subnets
C 2.2.4.0 is directly connected, Loopback0
C 2.2.5.0 is directly connected, Loopback1
C 2.2.6.0 is directly connected, Loopback2
C 2.2.7.0 is directly connected, Loopback3
3.0.0.0/24 is subnetted, 4 subnets
R 3.3.8.0 [120/1] via 23.1.1.2, 00:00:02, Serial0/1
R 3.3.9.0 [120/1] via 23.1.1.2, 00:00:02, Serial0/1
R 3.3.10.0 [120/1] via 23.1.1.2, 00:00:02, Serial0/1
R 3.3.11.0 [120/1] via 23.1.1.2, 00:00:02, Serial0/1
4.0.0.0/24 is subnetted, 4 subnets
R 4.4.12.0 [120/2] via 23.1.1.2, 00:00:02, Serial0/1
[120/2] via 12.1.1.1, 00:00:11, Serial0/0
R 4.4.13.0 [120/2] via 12.1.1.1, 00:00:11, Serial0/0
R 4.4.14.0 [120/2] via 23.1.1.2, 00:00:02, Serial0/1
[120/2] via 12.1.1.1, 00:00:11, Serial0/0
R 4.4.15.0 [120/2] via 23.1.1.2, 00:00:02, Serial0/1
[120/2] via 12.1.1.1, 00:00:11, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
172.16.0.0/32 is subnetted, 2 subnets
C 172.16.0.20 is directly connected, Loopback20
C 172.16.0.10 is directly connected, Loopback10
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, Serial0/0
14.0.0.0/24 is subnetted, 1 subnets
R 14.1.1.0 [120/1] via 12.1.1.1, 00:00:13, Serial0/0
R2#config t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#acc
R2(config)#access-list 12 permit 4.4.12.0
R2(config)#access-
R2(config)#access-list 13 permit 4.4.15.0
R2(config)#router rip
R2(config-router)#distance 255 23.1.1.2 0.0.0.0 ?
<1-99> IP Standard access list number
<1300-1999> IP Standard expanded access list number
WORD Standard access-list name
<cr>
R2(config-router)#distance 255 23.1.1.2 0.0.0.0 12
R2(config-router)#distance 255 12.1.1.1 0.0.0.0 13
R2(config-router)#do clear ip route *
R2(config-router)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
R 34.1.1.0 [120/1] via 23.1.1.2, 00:00:09, Serial0/1
1.0.0.0/24 is subnetted, 4 subnets
R 1.1.0.0 [120/1] via 12.1.1.1, 00:00:09, Serial0/0
R 1.1.1.0 [120/1] via 12.1.1.1, 00:00:09, Serial0/0
R 1.1.2.0 [120/1] via 12.1.1.1, 00:00:09, Serial0/0
R 1.1.3.0 [120/1] via 12.1.1.1, 00:00:09, Serial0/0
2.0.0.0/24 is subnetted, 4 subnets
C 2.2.4.0 is directly connected, Loopback0
C 2.2.5.0 is directly connected, Loopback1
C 2.2.6.0 is directly connected, Loopback2
C 2.2.7.0 is directly connected, Loopback3
3.0.0.0/24 is subnetted, 4 subnets
R 3.3.8.0 [120/1] via 23.1.1.2, 00:00:12, Serial0/1
R 3.3.9.0 [120/1] via 23.1.1.2, 00:00:12, Serial0/1
R 3.3.10.0 [120/1] via 23.1.1.2, 00:00:12, Serial0/1
R 3.3.11.0 [120/1] via 23.1.1.2, 00:00:12, Serial0/1
4.0.0.0/24 is subnetted, 4 subnets
R 4.4.12.0 [120/2] via 12.1.1.1, 00:00:12, Serial0/0
R 4.4.13.0 [120/2] via 12.1.1.1, 00:00:12, Serial0/0
R 4.4.14.0 [120/2] via 23.1.1.2, 00:00:12, Serial0/1
[120/2] via 12.1.1.1, 00:00:12, Serial0/0
R 4.4.15.0 [120/2] via 23.1.1.2, 00:00:12, Serial0/1
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
172.16.0.0/32 is subnetted, 2 subnets
C 172.16.0.20 is directly connected, Loopback20
C 172.16.0.10 is directly connected, Loopback10
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, Serial0/0
14.0.0.0/24 is subnetted, 1 subnets
R 14.1.1.0 [120/1] via 12.1.1.1, 00:00:13, Serial0/0
R2(config-router)#
