Troubleshooting RIP v2

This is a core TI.

Using debug can be challenging for some students as they become overwhelmed by the wealth of information that floods their screen and they are unable to decipher the meaning. Instructors should take time here to ensure that students start to interpret some of the debug output so that they are able to efficiently troubleshoot errors. Capture some debug output to a disk, enlarge it and display it up on a white background for discussion and interpretation. Make sure the students become familiar with Figures through . Although the lab is required, instructors are encouraged to adjust it to the lab environment and the students.

The practical lab and e-Lab enable students to troubleshoot using debug .

This page explains the use of the debug ip rip command.

Use the debug ip rip command to display RIP routing updates as they are sent and received. The no debug all or undebug all commands will turn off all debugging.

The example shows that the router being debugged has received updates from one router at source address 10.1.1.2. The router at source address 10.1.1.2 sent information about two destinations in the routing table update. The router being debugged also sent updates, in both cases to the multicast address 224.0.0.9 as the destination. The number in parentheses is the source address encapsulated into the IP header.

Other outputs sometimes seen from the debug ip rip command includes entries such as the following:

RIP: broadcasting general request on Ethernet0

RIP: broadcasting general request on Ethernet1

These outputs appear at startup or when an event occurs such as an interface transition or a user manually clears the routing table.

An entry, such as the following, is most likely caused by a malformed packet from the transmitter:

RIP: bad version 128 from 160.89.80.43

Examples of debug ip rip outputs and meanings are shown in Figure .

The Lab Activities will help students become more familiar with debug commands.

The next page will discuss default routes.

Lab Exercise: Troubleshooting RIP v2 using debug

In this lab, the students will use debug commands to verify proper RIP operation and analyze data transmitted between routers.

e-Lab Activity: RIP v2 using debug

In this lab, the students will enable routing on the router, save the configuration, and ping interfaces on routers.