Cisco's routing redistribution

There may be many routing protocols in a large network, so it is related to the problem of routing redistribution. The network architecture looks like this:

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Schema Description:

1 R1 for the head office router;

2 R2, R5 for the Shanghai branch router;

3 R3, R4 for the Hangzhou branch router;

4 the OSPF protocol is used between the head office and the branch office, and the Shanghai branch uses the RIP protocol, while the Hangzhou branch uses the static routing protocol.

5 All branches access to the public network through the head office router R1 implementation;

6 Local host is simulated by LOOPBACK1 interface;

7 Loopback0 uses 192.168.255.0/24 network segment and as Router ID;

1) Configure basic information

The R1 configuration is as follows:

R1 (config) #hostname R1

R1 (config) #int f0/0

R1 (config-if) #ip add 10.0.0.1 255.255.255.252

R1 (config-if) #no sh

R1 (config-if) #int f1/0

R1 (config-if) #ip add 10.0.0.6 255.255.255.252

R1 (config-if) #no sh

R1 (config-if) #int f2/0

R1 (config-if) #ip add 172.16.31.1 255.255.255.252

R1 (config-if) #no sh

R1 (config) #int loopback 0

R1 (config-if) #ip add 192.168.255.1 255.255.255.0

R1 (config-if) #no sh

R1 (config) #int loopback 1

R1 (config-if) #ip add 192.168.1.1 255.255.255.0

R1 (config-if) #no sh

R1 (config) #router OSPF 1

R1 (config-router) #router-id 192.168.255.1

R1 (config-router) #network 192.168.1.0 0.0.0.255 area 0

R1 (config-router) #network 10.0.0.4 0.0.0.3 Area 1

R1 (config-router) #network 192.168.255.1 0.0.0.0 area 0

R1 (config-router) #network 10.0.0.0 0.0.0.3 area 0

R1 (config) #ip Route 0.0.0.0 0.0.0.0 172.16.31.2

The R2 configuration is as follows:

R2 (config) #hostname R2

R2 (config) #int f0/0

R2 (config-if) #ip add 10.0.0.2 255.255.255.252

R2 (config-if) #no sh

R2 (config-if) #int f1/0

R2 (config-if) #ip add 192.168.100.1 255.255.255.0

R2 (config-if) #no sh

R2 (config) #int loopback 0

R2 (config-if) #ip add 192.168.255.2 255.255.255.255

R2 (config-if) #no sh

R2 (config) #router OSPF 1

R2 (config-router) #router-id 192.168.255.2

R2 (config-router) #network 10.0.0.0 0.0.0.3 area 0

R2 (config-router) #network 192.168.255.2 0.0.0.0 area 0

R2 (config) #router rip

R2 (config-router) #version 2

R2 (config-router) #no auto-summary

R2 (config-router) #network 192.168.100.0

The R3 configuration is as follows:

R3 (config) #hostname R3

R3 (config) #int f1/0

R3 (config-if) #ip add 10.0.0.5 255.255.255.252

R3 (config-if) #no sh

R3 (config-if) #int f0/0

R3 (config-if) #ip add 10.0.0.10 255.255.255.252

R3 (config-if) #no sh

R3 (config) #int loopback 0

R3 (config-if) #ip add 192.168.255.3 255.255.255.255

R3 (config-if) #no sh

R3 (config) #router OSPF 1

R3 (config-router) #router-id 192.168.255.3

R3 (config-router) #network 10.0.0.4 0.0.0.3 Area 1

R3 (config-router) #network 192.168.255.3 0.0.0.0 Area 1

R3 (config) #ip Route 192.168.3.0 255.255.255.0 10.0.0.9

The R4 configuration is as follows:

R4 (config) #hostname R4

R4 (config) #int f0/0

R4 (config-if) #ip add 10.0.0.9 255.255.255.252

R4 (config-if) #no sh

R4 (config) #int loopback 0

R4 (config-if) #ip add 192.168.255.4 255.255.255.255

R4 (config-if) #no sh

R4 (config) #int loopback 1

R4 (config-if) #ip add 192.168.3.1 255.255.255.0

R4 (config-if) #no sh

R4 (config) #ip Route 0.0.0.0 0.0.0.0 10.0.0.10

The R5 configuration is as follows:

R5 (config) #hostname R5

R5 (config) #int f0/0

R5 (config-if) #ip add 192.168.100.2 255.255.255.0

R5 (config-if) #no sh

R5 (config) #int loopback 1

R5 (config-if) #ip add 192.168.2.1 255.255.255.0

R5 (config-if) #no sh

R5 (config) #router rip

R5 (config-router) #version 2

R5 (config-router) #no auto-summary

R5 (config-router) #network 192.168.100.0

R5 (config-router) #network 192.168.2.0

The Internet configuration is as follows:

Internet (config) #hostname internet

Internet (config) #int f0/0

Internet (config-if) #ip add 172.16.31.2 255.255.255.252

Internet (config-if) #no sh

Internet (config) #int loopback 1

Internet (config-if) #ip add 59.56.61.1 255.255.255.0

Internet (config-if) #no sh

To view the routing table:

R1#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 are 172.16.31.2 to network 0.0.0.0

172.16.0.0/30 is subnetted, 1 subnets

C 172.16.31.0 is directly connected, fastethernet2/0

10.0.0.0/30 is subnetted, 2 subnets

C 10.0.0.0 is directly connected, fastethernet0/0

C 10.0.0.4 is directly connected, fastethernet1/0

192.168.255.0/24 is variably subnetted, 3 subnets, 2 masks

O 192.168.255.3/32 [110/2] via 10.0.0.5, 00:21:37, fastethernet1/0

O 192.168.255.2/32 [110/2] via 10.0.0.2, 00:31:22, fastethernet0/0

C 192.168.255.0/24 is directly connected, Loopback0

C 192.168.1.0/24 is directly connected, Loopback1

s* 0.0.0.0/0 [1/0] via 172.16.31.2

2) Configure route redistribution:

Router R1 re-publishes the default route:

R1 (config) #router OSPF 1

R1 (config-router) #default-information originate always

Router R2 redistribution:

R2 (config) #router OSPF 1

R2 (config-router) #redistribute RIP subnets

R2 (config) #router rip

R2 (config-router) #redistribute OSPF 1 metric 3

Router R3 re-publishes static routes and direct-attached routes:

R3 (config) #router OSPF 1

R3 (config-router) #redistribute static subnets

R3 (config-router) #redistribute connected subnets

3) Verify that network communication is normal

R3#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 are 10.0.0.6 to network 0.0.0.0

10.0.0.0/30 is subnetted, 3 subnets

C 10.0.0.8 is directly connected, fastethernet0/0

O IA 10.0.0.0 [110/2] via 10.0.0.6, 00:02:31, fastethernet1/0

C 10.0.0.4 is directly connected, fastethernet1/0

192.168.255.0/32 is subnetted, 3 subnets

C 192.168.255.3 is directly connected, Loopback0

O IA 192.168.255.2 [110/3] via 10.0.0.6, 00:02:31, fastethernet1/0

O IA 192.168.255.1 [110/2] via 10.0.0.6, 00:02:31, fastethernet1/0

192.168.1.0/32 is subnetted, 1 subnets

O IA 192.168.1.1 [110/2] via 10.0.0.6, 00:02:33, fastethernet1/0

O E2 192.168.2.0/24 [110/20] via 10.0.0.6, 00:02:33, fastethernet1/0

O E2 192.168.100.0/24 [110/20] via 10.0.0.6, 00:02:33, fastethernet1/0

S 192.168.3.0/24 [1/0] via 10.0.0.9

O*e2 0.0.0.0/0 [110/1] via 10.0.0.6, 00:02:35, fastethernet1/0

r4#ping 192.168.2.1 Source 192.168.3.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:

Packet sent with a source address of 192.168.3.1

!!!!!

r5#ping 10.0.0.5 Source 192.168.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.0.0.5, timeout is 2 seconds:

Packet sent with a source address of 192.168.2.1

!!!!!

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Cisco's routing redistribution