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EIGRPv6 neighboring

solemdoms5
Beginner
Beginner

EIGRP for IPv4 need to match the subnet mask ,K value , AS number, MTU between routers for forming neighbor relationship .

however I saw the question like follwing

Q.How will EIGRPv6 react if there is an IPv6 subnet mask mismatch between the Global Unicast addresses on a poin-to-point link ?

the answer is that EIGRPv6 will form a neighbor relationship .

so I wanna know the neighboring about EIGRPv6 .

Neighboring relationship on EIGRPv6 routers , What factor do i need to match ?

1 Accepted Solution

Accepted Solutions

paul driver
VIP Expert VIP Expert
VIP Expert

Hello,

Just like add to that-

  • On serial interfaces the link-local dressing & map statements are required
  • Eigrp process -
  1. no automatic summarisation ( no auto-summary command)" as eigrpv6 doesn't support classless networks
  2. implict shutdown ( requires no shutdown command)
  3. requires router id's

res

Paul

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Please rate and mark as an accepted solution if you have found any of the information provided useful.
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Kind Regards
Paul

View solution in original post

3 Replies 3

cadet alain
Mentor
Mentor

Hi,

IPv6 IGPs form neighborships with the link-local address so they don't care about the global unicast address mismatch.

Apart from that AS, K values and authentication must match to form a neighborship like in IPv4.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

paul driver
VIP Expert VIP Expert
VIP Expert

Hello,

Just like add to that-

  • On serial interfaces the link-local dressing & map statements are required
  • Eigrp process -
  1. no automatic summarisation ( no auto-summary command)" as eigrpv6 doesn't support classless networks
  2. implict shutdown ( requires no shutdown command)
  3. requires router id's

res

Paul

Please don't forget to rate this post if it has been helpful.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Hi,

just to add something:

2. not anymore on latest IOS.

3. yes if you have no IPv4 address on the device then you'll have to specify a router-id

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
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