Pages

EarnKori Headline Animator

Search This Blog

Jun 12, 2011

How to Configure EIGRP With RIP On Same Network

How to Configure EIGRP With RIP On Same Network


In this article we will discuss how can two routing protocols exist in same network? We have discussed basic of both EIGRP and RIP in our pervious article. Now we will go in more depth by including both RIP and EIGRP in same network.

Scenario

You are the administrator at http://earnkori.blogspot.com. Company network is given below,


R0
PortIP addressConnected to
F0/080.0.0.1R1   F0/1
F1/090.0.0.1R2 F0/1
F1/1100.0.0.1R3 F0/1



R1
PortIP addressConnected to
F0/0.1010.0.0.1S1 F0/24
F0/0.2020.0.0.1S1 F0/24
F0/180.0.0.2R0 F0/0
S0/0/030.0.0.1R2 S0/0
R2
PortIP addressConnected to
F0/190.0.0.2R0 F1/0
S0/030.0.0.2R1 S0/0/0
F0/040.0.0.1WR1 0/1
S0/150.0.0.1R3 S0/0/1
R3
PortIP addressConnected to
F0/1100.0.0.2R0 F1/1
S0/0/150.0.0.2R2 S0/1
F0/0.6060.0.0.1S1 G0/1
F0/0.7070.0.0.1S1 G0/1

IP address and other necessary configurations are already done on routers, switches, and on pc's, you need only to configure routing.



Company has 3 main routers R1, R2, R3 connected via serial cable. All these routers are also connected with R0 for backup. Your task is to configure routing protocols on these routers. Backup route should only use when main route is down. IP address and other necessary configuration is already done on all devices. You are only required to configure routing protocols on routers.

In this scenario R0 is only providing backup to main links of R1, R2, R3. And it should only use in the failure of main links. This is a tricky question. Its directly related to administrative distance. As we know Administrative distance of RIP is 120 and EIGRP is 90. If both protocol exist on same router and have path for destination, EIGRP path will be chosen by default as it have low AD value. And in routing decision low AD value is winner.

Configuration of R0

First we will configure R0. To configure double click on R0 select CLI and configure it as given below

To configure and enable RIP as backup routing on R0 follow these commands exactly.

 
R0>enable
R0#sh ip interface brief
Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        80.0.0.1        YES manual up                    up

FastEthernet1/0        90.0.0.1        YES manual up                    up

FastEthernet1/1        100.0.0.1       YES manual up                    up
R0#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R0(config)#router rip
R0(config-router)#network 80.0.0.0
R0(config-router)#network 90.0.0.0
R0(config-router)#network 100.0.0.0
R0(config-router)#exit
R0(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
R0#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
R0#


We need not to configure EIGRP on it as its only going to an backup route


 Configuration of R1

Now configure R1. On R1 we need to configure both RIP and EIGRP. RIP for backup and EIGRP for main route.
 
R1>enable
R1#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        unassigned      YES manual up                    up

FastEthernet0/0.10     10.0.0.1        YES manual up                    up

FastEthernet0/0.20     20.0.0.1        YES manual up                    up

FastEthernet0/1        80.0.0.2        YES manual up                    up

Serial0/0/0            30.0.0.1        YES manual up                    up

Serial0/0/1            unassigned      YES manual administratively down down

Vlan1                  unassigned      YES manual administratively down down
R1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#router rip
R1(config-router)#network 10.0.0.0
R1(config-router)#network 20.0.0.0
R1(config-router)#network 30.0.0.0
R1(config-router)#network 80.0.0.0
R1(config-router)#exit
R1(config)#router eigrp 1
R1(config-router)#network 10.0.0.0
R1(config-router)#network 20.0.0.0
R1(config-router)#network 30.0.0.0
R1(config-router)#exit
R1(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
R1#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
R1#

Why did we not include network 80.0.0.0 in EIGRP routing?
Network 80.0.0.0 is connecting R1 to R0 which is backup route. And only going to be used In the failure of main EIGRP route.

If we include network 80.0.0.0 in EIGRP routing, still R1 will take main EIGRP (via R2) route to reach R3 why?

Because by default Matrix of EIGRP is bandwidth and delay, and in this scenario backup route (R1 – R0 – R3) is using Ethernet cable link and main EIGRP route ( R1 – R2 – R3) is using serial cable link. Serial link have better matrix then Ethernet link that's why R1 will take main EIGRP route to reach R3.

Configuration of R2

To configure and enable eigrp with rip routing on R2 follow these commands exactly.

 
Router>enable
R2#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        40.0.0.1        YES manual up                    up

FastEthernet0/1        90.0.0.2        YES manual up                    up

Serial0/0              30.0.0.2        YES manual up                    up

Serial0/1              50.0.0.1        YES manual up                    up
R2#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#router rip
R2(config-router)#network 30.0.0.0
R2(config-router)#network 40.0.0.0
R2(config-router)#network 50.0.0.0
R2(config-router)#network 90.0.0.0
R2(config-router)#exit
R2(config)#router eigrp 1
R2(config-router)#network 30.0.0.0
R2(config-router)#
R2(config-router)#network 40.0.0.0
R2(config-router)#network 50.0.0.0
R2(config-router)#exit
R2(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
R2#

Configuration of R3

To configure and enable eigrp with rip routing on R3 follow these commands exactly.
 
Router>enable
R3#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/0        unassigned      YES manual up                    up

FastEthernet0/0.60     60.0.0.1        YES manual up                    up

FastEthernet0/0.70     70.0.0.1        YES manual up                    up

FastEthernet0/1        100.0.0.2       YES manual up                    up

Serial0/0/0            unassigned      YES manual administratively down down

Serial0/0/1            50.0.0.2        YES manual up                    up

Vlan1                  unassigned      YES manual administratively down down
R3#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
R3(config)#router rip
R3(config-router)#network 50.0.0.0
R3(config-router)#network 60.0.0.0
R3(config-router)#network 70.0.0.0
R3(config-router)#network 100.0.0.0
R3(config-router)#exit
R3(config)#router eigrp 1
R3(config-router)#network 50.0.0.0
R3(config-router)#network
R3(config-router)#network 60.0.0.0
R3(config-router)#network 70.0.0.0
R3(config-router)#exit
R3(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
R3#

Testing of EIGRP with RIP

Now we have configured both RIP and EIGRP in this network. To test this network double click on PC-PT PC0 and select command prompt tracert 70.0.0.3

As you can see image R1 is taking Main EIGRP route to rich at R3

Now remove the serial cable by using red cross sign shown in right control panel



Now again tracert 70.0.0.3 from PC0

As you can see in image this time R1 takes R0 to reach R3 because Main EIGRP route is down.

No comments: