Lab 10-4 – Configuring Mutual EIGRP and RIP Redistribution
In this lab you will learn how to configure mutual redistribution between the Enhanced Interior Gateway Routing protocol (EIGRP) and Routing Information Protocol (RIP) at a single centralized router
Real World Application & Core Knowledge
If you’ve completed Lab 10-2 – Configuring Mutual OSPF and RIP Redistribution and Lab 10-3 – Configuring Mutual OSPF and EIGRP Redistribution then you should be no stranger to mutual route redistribution.
If you did not complete the previous labs then to summarize mutual route redistribution up in a pretty little nut shell; mutual route redistribution is the process where two dynamic routing protocols exchange their routes with each other. For example, When you redistribute EIGRP into RIP, all routes in the EIGRP Autonomous System will be injected into the RIP database and show up as regular RIP routes. The same concepts apply to EIGRP when you redistribute RIP into EIGRP, all the routes from RIP will be injected into the EIGRP topology table and advertised through out the autonomous system as an EIGRP External route. These routes are denoted as “D EX” routes in the routing table.
Mutual route redistribution is a common remedy when companies acquire other companies that use different routing protocols. In such case Company ABC Inc. acquires Company XYZ Inc. however ABC Inc. uses EIGRP and XYZ Inc. uses RIP. After the acquisition, the CTO (Chief Technology Officer) Mandates that there be full network communication between the newly merged companies. In this case you’d need to perform mutual redistribution to ensure ABC Inc. has routes to XYZ’s network; vice-versa.
When you configure mutual route redistribution its best practice to specify a static metric. When specifying a metric keep in mind if you have multiple routers performing mutual redistribution you may need to have a higher metric on one router then the other to prevent a routing loop; this is where packets just keep going in circles between the two autonomous systems. It’s a safe bet to specify a fairly high metric in a production network to prevent such routes from becoming looped as lower metric routes are preferred.
To configure route redistribution you’ll use the redistribute command in router configuration mode.
Please review the following command(s) listed below;
redistribute type metric {metric info} – This command is executed in router configuration mode of RIP, EIGRP or OSPF to configure the routing process to redistribute routes from a different source into the configured routing process such as static into RIP or RIP into OSPF. It’s best practice to specify a metric; when specifying a metric you specify a metric to be used by the routes when they appear in the routing process. For example, RIP uses hop counts, OSPF uses cost and EIGRP uses K Values (bandwidth, load, delay, reliability, mtu)
The following logical topology shown below is used in this lab;
Lab Prerequisites
- If you are using GNS3 than load the Stub Area Networking GNS3 topology than start devices; R1, R2, R3, R4, and R5
- Establish a console session with devices R1, R2, R3, R4, and R5 than load the initial configurations provided below by copying the config from the textbox and pasting it into the respected routers console.
Lab Objectives
- Create four new loopback interfaces on R1 using the 10.1.0.0/22 address allocation and configure those interfaces to participate in EIGRP Autonomous System 10.
- Create four new loopback interfaces on R5 using the 172.5.0.0/22 address allocation and configure those interfaces to participate in RIP.
- Analyze R3′s routing table and verify that the newly created loopback interfaces are being learned by R3.
- Configure R3 to redistribute EIGRP routes into RIP using a hop count of 3 then redistribute RIP routes into EIGRP using a T1 bandwidth and 20,000 microsecond delay.
- Verify on R1 and R5 that routes from the opposite autonomous system exist in their routing table.
Lab Instruction
Objective 1. – Create four new loopback interfaces on R1 using the 10.1.0.0/22 address allocation and configure those interfaces to participate in EIGRP Autonomous System 10.
R1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. R1(config)#interface loopback0 R1(config-if)#ip address 10.1.0.1 255.255.255.0 R1(config-if)# R1(config-if)#interface loopback1 R1(config-if)#ip address 10.1.1.1 255.255.255.0 R1(config-if)# R1(config-if)#interface loopback2 R1(config-if)#ip address 10.1.2.1 255.255.255.0 R1(config-if)# R1(config-if)#interface loopback3 R1(config-if)#ip address 10.1.3.1 255.255.255.0 R1(config-if)#exit R1(config)# R1(config)#router eigrp 10 R1(config-router)#network 10.1.0.0 0.0.3.255 R1# %SYS-5-CONFIG_I: Configured from console by console R1#
Objective 2. – Create four new loopback interfaces on R5 using the 172.5.0.0/22 address allocation and configure those interfaces to participate in RIP.
R5#configure terminal Enter configuration commands, one per line. End with CNTL/Z. R5(config)#interface loopback0 R5(config-if)#ip address 172.5.0.1 255.255.255.0 R5(config-if)# R5(config-if)#interface loopback1 R5(config-if)#ip address 172.5.1.1 255.255.255.0 R5(config-if)# R5(config-if)#interface loopback2 R5(config-if)#ip address 172.5.2.1 255.255.255.0 R5(config-if)# R5(config-if)#interface loopback3 R5(config-if)#ip address 172.5.3.1 255.255.255.0 R5(config-if)#exit R5(config)#router rip R5(config-router)#network 172.5.0.0 R5(config-router)#end R5# %SYS-5-CONFIG_I: Configured from console by console R5#
Objective 3. – Analyze R3′s routing table and verify that the newly created loopback interfaces are being learned by R3.
R3#show 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
* - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static routeGatew
excelent
Great. Ive picked alot. Thank you.
THIS IS WONDERFUL, INFACT IT SOLVE ALL THE CHALLENGES I HAD.
excellent , very professional indeed……thanks a lot for help!
I don’t understand plz help me why EIGRP10 metric 3 ( “”"R3(config-router)#redistribute
eigrp 10 metric 3″”")
E X C E L E N T !!!!!!
The discussion as to how to trace redistribution from point of advertisement in the “source” IGP to injection into the “dest” protocol is perfect. Thank you so much!!!!