Greg explores the similarities and differences of EIGRP for IPv6 and that of EIGRP for IPv4. Learn how EIGRP for IPv6 is configured in the traditional manner as well as the modern form, named EIGRP.
- [Speaker] EIGRP for IPv6 which I'll lazily call EIGRPv6 has more similarities than differences with IPv4 for EIGRP. This being the case, I'll outline a few of the differences. EIGRPv6 advertises IPv6 prefixes and links rather than IPv4 information. EIGRPv6 is encapusulated inside of IPv6 headers. EIGRPv6 also uses a router's link local address as the next-hop for routes.
EIGRPv6 has no concept of class for networks. Thus, it doesn't have auto summarization on by default like IPv4 for EIGRP does. Last, EIGRPv6 neighbors don't have to be in the same subnet. Be sure to pause the video and review the included chart for various protocol details. Utilizing this diagram, I'll introduce Router 1 into the EIGRP domain. I've pre-configured Router 2 and 3, so as soon as I complete Router 1, all the neighborships should establish.
First, I'll configure the router to support IPv6 unicast routing with IPv6 unicast-routing. The EIGRPv6 routing process needs to determine a router ID either via the EIGRP sub-command router ID highest IP before address configured on an up-up loop-back interface, or the highest IPv4 address on a standard up-up interface. I like to configure a loop-back interfaces so I've got a loop-zero pre-configured with IP 220.127.116.11.
Next, I'll enable an EIGRPv6 with IPv6 router EIGRP 10, then no-shut the protocol, no shut down. Any interfaces that are in a support IPv6 neighbors should either have an IPv6 address configured or the IPv6 enable command configured so that a link local address is configured. The last step is to enable EIGRP on the interface that should find neighbors.
I'll enable it quickly with the range command. Interface, range, gig, zero one to two, and then the EIGRP command, IPv6, EIGRP, 10, where 10 is the ASN I configured earlier on the routing process. Not only do I get a console command about the neighbors coming up, but I can also verify the neighbors via do show IPv6 EIGRP neighbors.
I can now verify the learned EIGRP routes via show IPv6 routes. Anything listed with a capital d for duel has been learned via EIGRP. Verification commands for IvP6 are the same as those for IvP4, only the command is pre-faced with IvP6 as in, show IvP6 EIGRP neighbors. Cisco's newest flavor of EIGRP is named EIGRP.
This combines common configurations for IPv4 and v6 EIGRP into a single place and breaks up the individual protocols into Address Families similar to VGP. Address Families are broken into categories like IPv4, IPv6 unicast routing, and IPv4 multicast routing. Inside of Address Families an administrator can configure stub routers, router ID, network commands, and the like.
Another key concept inside of Address Families is AF-interfaces. Any commands that would have been entered under interface configuration mode, would now be entered inside of AF-interface. Any commands that pertains to topology like variance commands or redistribution are entered in the AF topology section. To demonstrate, I'll utilize this simple design. As per the usual, I've already pre-configured Router 2.
So as soon as I complete Router 1's configuration, neighborships should establish. I'll start by entering into Named EIGRP mode. Router, EIGRP, Greg Sowell. I'll bring up my IPv4 unicast session first. Address Family, IPv4, unicast, autonomous-system, 10.
As shown in the command, I've set the AS to 10. I will now use the network command at Fast One Zero. Network 192.168.0.0 0.0.0.3 for the wild-card mask. The console message shows the neighbors established, but I can use the standard EIGRP verification commands. Do show IP EIGRP neighbor. It's obvious from this output that some things are different. Namely the fact that the named group Greg Sowell is displayed along with the Address Family AS of 10 is listed.
I'll now jump into the IvP6 unicast Address Family. First, exit and then into the next Family. Address Family, IvP6, unicast autonomous-system, we'll make this one 11. The instant I entered the Address Family, it will enable the IPv6 EIGRP process and neighbors will establish. Verification is done via do show IPv6 EIGRP neighbor.
Verifying learned routes follows the normal process. Show IP route for IPv4 and show IPv6 route for IPv6. While this chapter was short, be prepared to see a bit of IPv6 in conjunction with dynamic routing on the test.
- Configuring a basic Enhanced Interior Gateway Routing Protocol (EIGRP) network
- Static neighbors or K-values
- Topology exchange
- Limiting query scope
- EIGRP default routing
- EIGRP for IPv6
- Open Shortest Path First (OSPF) fundamentals