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 previous article. Now we will
go in more depth by including both RIP and EIGRP in same network.
Scenario
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R0
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Port
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IP address
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Connected to
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F0/0
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80.0.0.1
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R1 F0/1
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F1/0
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90.0.0.1
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R2 F0/1
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F1/1
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100.0.0.1
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R3 F0/1
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R1
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Port
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IP address
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Connected to
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F0/0.10
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10.0.0.1
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S1 F0/24
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F0/0.20
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20.0.0.1
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S1 F0/24
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F0/1
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80.0.0.2
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R0 F0/0
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S0/0/0
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30.0.0.1
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R2 S0/0
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R2
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Port
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IP address
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Connected to
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F0/1
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90.0.0.2
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R0 F1/0
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S0/0
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30.0.0.2
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R1 S0/0/0
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F0/0
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40.0.0.1
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WR1 0/1
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S0/1
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50.0.0.1
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R3 S0/0/1
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R3
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Port
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IP address
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Connected to
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F0/1
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100.0.0.2
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R0 F1/1
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S0/0/1
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50.0.0.2
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R2 S0/1
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F0/0.60
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60.0.0.1
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S1 G0/1
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F0/0.70
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70.0.0.1
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S1 G0/1
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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.
Download pre
configured topology form here and load it in packet tracer
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 be a 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
We have a
configured topology here for cross checking if you have done any error in
configuration. Download it and check where you have done mistake
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