ipv6 router eigrp VS router eigrp + address-family ipv6

I am confused, what are the differences between these two?


Cisco doc for EIGRP IPv6 is using "ipv6 router eigrp" 



But if you look at INEv5 Foundation Lab 2 8.1 for EIGRP IPv6, it is using "router eigrp + address-family ipv6" 



Any help would be appreciated!


  • I guess one is old-style ipv6 eigrp, the other is multi-AF Named Mode

  • right - basically just like ipv4 eigrp, they're two different CLI formats for the same protocol - having said that you get certain things with the named/address family mode like wide metrics, a more logical grouping for commands - (no more split horizon or md authentication on the interfaces - it goes under the address family)

    And I believe there are some advanced route tag options that may only be available in named mode as well as SHA authentication which is only available in named mode - watching the EIGRP named mode video for ipv4 will give you the skinny on ipv6 as they are essentially configured the same except for the addressing


  • Hi,

       Initially you had "router eigrp" command for IPv4, when cisco added EIGRP support for IPv6, they added "ipv6 router eigrp" command, both of htse being EIGRP classic-mode; and finnaly now we have EIGRP named mode, which is multi-AF aware and you have all EIGRP configurations (IPv4/IPv6, VRF and non-VRF mode) under one container. Also EIGRP named mode adds several changes to metric computation, support several features which are not supported in classic-mode, and this is what you should be using from now on in production networks, as all new features added to EIGRP will bbe supported only in named mode; for example if you want to run EIGRP for IPv6 in VRF, you HAVE to use named mode.



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