EIGRPv6 for IPv6 #2

By Chris May 11, 2016 09:05

Of all the CLI features in CCNA, the routing protocols seem to get the most attention. This post helps you prepare for those Sim and Simlet questions with more practice on EIGRP for IPv6, with the usual 5-10 minute paper exercise. And feel free to try these on real gear or VIRL! This lab asks you to make EIGRP for IPv6 work.


Configure EIGRP for IPv6 so that it chooses the best paths based on one change to the delay value on the interfaces connected to one link. Figure 1 shows the link and the delay value. The lab begins with all the interfaces shown in Figure 1 connected, working, and with IPv6 addresses configured.

Your job in this lab:

  • Use ASN 40
  • Set the delay on all interfaces to match the notes in the figure; use defaults if not specified in the figure
  • Assume all interfaces in the figure are up and working when the lab begins
  • Assume all IPv6 neighbors in the figure are pingable when the lab begins
  • Configure a router-id using the x.x.x.x template, where x is the router number

Figure 1: Three Router Triangle with Unicast IPv6 Addresses


Initial Configuration


Examples 1, 2, and 3 show the beginning configuration state of R1, R2, and R3.

Example 1: R1 Config


Example 2: R2 Config


Example 3: R3 Config


Answer on Paper, or Maybe Test in Lab

Next, write your answer on paper. Or if you have some real gear or other tools, configure the lab using them.

For this lab, all you need are three routers in a triangle, with any types of interfaces. If you do not have routers with Gigabit interfaces, you can still do this lab. The lab uses a rather large delay setting of 100,000 microseconds on purpose. Note that you could even use serial links between the three routers, and the default delay settings on those interfaces would still be less than the 100,000 setting on the R1-R3 link. As a result, if you replace the links between routers with other types of links, the routers should still avoid using the R1-R3 link in this lab.

For testing, once completed, all three routers should list all routes in the output of the show ipv6 route command. Also, R2’s route to 2333::/64 should refer to R1 as the next-hop router, and R3’s route to 2222::/64 should list R1 as the next hop router as well. The show ipv6 eigrp neighbors command should list two neighbors on each router.


Do this Lab with Cisco’s VIRL

You can do these labs on paper and still get a lot out of the lab. As an extra help, we have added files for the Virtual Internet Routing Lab (VIRL) software as well. The .VIRL file found here is a file that when used with VIRL will load a lab topology similar to this lab’s topology, with the initial configuration shown in the lab as well. This section lists any differences between the lab exercise and the .VIRL file’s topology and configuration.

Download this lab’s VIRL file!

The virl topology matches this lab topology exactly. The host info does as well.

Answers: IPv4 Static Routes 1
Answers: EIGRPv6 for IPv6 #2
By Chris May 11, 2016 09:05
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