IPv6 Special Addresses 1

By certskills May 6, 2016 09:05

This latest config lab takes a backwards approach to configuration. In this case, it starts with a bunch of show commands, and asks you to derive some of the key configuration items on several routers. The theme: IPv6 addressing. By doing this lab, you will need to think hard about the unicast and multicast addresses listed in the output of the show ipv6 interface command.


This lab begins with a partially-complete configuration. It has some IPv6 configuration, but it is missing some. Your job is as follows:

  • Predict what the current IPv6 configuration of each router is based on the show command output listed in Examples 1 through 5.

For this lab, you can make these assumptions:

  • All router interfaces shown in the lab are up and working.
  • IPv6 routing (ipv6 unicast-routing) is enabled
  • The figure shows the planned IPv6 subnets, with plans to use OSPF process 10 on all routers and area 0 throughout the design. However, some of those features may not as of yet be configured.


Figure 1: Three Router Topology


Example 1: R1 Gi0/1 interface


Example 2: R2 Gi0/1 interface


Example 3: R2 Gi0/2 interface


Example 4: R3 Gi0/1 interface


Example 5: R3 Gi0/2 interface


Initial Configuration

Examples 6, 7, and 8 show the beginning configuration state of R1, R2, and R3.


Example 6: R1 Config


Example 7: R2 Config


Example 8: 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 with those tools.

For this lab, you need to play detective. If you do build this in lab, experimenting can help a lot. So, build the topology, and add the initial configuration. Then add just one IPv6 interface subcommand, and issue a show ipv6 interface command and look for the notes about unicast and multicast addresses. Keep doing that until you get a sense for which commands make which unicast and which multicast addresses begin to show up in the output.


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!

All interfaces in topology match the lab figure.

Answers: Multi-area OSPF 2
Answers: IPv6 Special Addresses 1
By certskills May 6, 2016 09:05
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