How to configure your Cisco 3560 MLS to use EIGRP for IPv6

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How to configure your Cisco 3560 MLS to use EIGRP for IPv6

Like This Blog 0 Mark Jacob
Added by July 11, 2014

Do you have a 3560 switch and you want to run EIGRP for IPv6? Have you typed ipv6 router ? and you don’t even see eigrp as one of the options? I did some research on Cisco’s feature navigator in response to some students’ questions on this topic and discovered that the 3560 switch DOES support this feature, but you must have the correct IOS version to make it happen. It turns out that I have a 3560 in my lab so I wanted to see if my switch could do it. Here is a portion of my show version output:

CoreSwitch uptime is 6 hours, 34 minutes
System returned to ROM by power-on
System image file is “flash:c3560-advipservicesk9-mz.122-40.SE.bin”

This version of the IOS was on Cisco’s list as a supporter of IPv6 EIGRP. Let’s verify:

001-cisco-IPv6-EIGRP-configure-3560-mls

It appears that EIGRP is among the IPv6 routing protocol options. Let’s configure it and see if we get a neighbor. I connected this 3560 to a 2901 router (which I know supports EIGRP for IPv6) to shrink the scope of my possible failure zone. What I mean is since I know this router definitely supports my choice of routing protocol, any issue I have getting it to work will more likely be on the switch side rather than the router side. Here is the scenario.

002-cisco-switch-IPv6-EIGRP-configure-3560-mls

I have hard-coded the speed to 100 Mbps and the duplex to full on the link between my two devices. First let’s see if they see each other at layer 2.

003-cisco-layer-2-IPv6-EIGRP-configure-3560-mls

004-cisco-layer-2-IPv6-EIGRP-configure-3560-mls

Sure enough, each device sees the other as a CDP neighbor. So far, so good. Now to configure EIGRP for IPv6 on the router:

From global config mode I will configure ipv6 router eigrp 1 and no shut the eigrp instance. On the router’s g0/1 interface I will configure the following:

ipv6 address 2001:DB8:C0A8:1::2/64

Then I will enable eigrp on the interface with this: ipv6 eigrp 1

The rest of the establishment of the neighbor relationship will happen on the 3560. Here is the config and the results:

005-cisco-neighbor-IPv6-EIGRP-configure-3560-mls

Does CoreSwitch have an IPv6 neighbor?

006-cisco-neighbor-CoreSwitch-IPv6-EIGRP-configure-3560-mls

Notice that a neighbor relationship has been established, but that this device knows its neighbor by its link-local (FE80::/10) address, not its global-unicast (2001) address. This is normal and expected behavior. How about the other way?

007-cisco-neighbor-CoreSwitch-IPv6-EIGRP-configure-3560-mls

Yep, the 2901 router sees its IPv6 EIGRP neighbor using its link-local address also. Another command that can be used to verify (or troubleshoot if needed) is this one:

008-cisco-neighbor-2901-IPv6-EIGRP-configure-3560-mls

EIGRP for IPv6 is alive and well on the 2901 router. How about the switch?

009-cisco-neighbor-2901-switch-IPv6-EIGRP-configure-3560-mls

There you have it. A 3560 can support IPv6 EIGRP, as long as you have the correct IOS version installed. Once that is in place, the configuring of IPv6 EIGRP is straightforward, as you have seen. There are still many networks in production sporting 3560s, so hopefully this will squeeze even a little more life out of them – for those whose budgets may be preventing wholesale ripping out of your older layer 3 switches. Please feel free to comment or contribute if you have any additional thoughts on this blog topic. Until next time…

 
Mark Jacob
Cisco Instructor – Interface Technical Training
Phoenix, AZ

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