cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
3381
Views
10
Helpful
3
Replies

Ipv6 neighbor table empty for unknown reason

I have the following network:

IPv6 Neighbor question.png

I have not configured OSPFv3 yet but all the IPs and interfaces are configured as shown. However I am finding that the show ipv6 neighbors command is not showing anything. My understanding is that this is like the ARP table for IPv4. I can even see NS and NA message bouncing back and forth through debugging and wireshark but nothing shows in the neighbor table and I dont know why.

R1(config)#int ser0/1
R1(config-if)#shut

*Mar  1 00:11:03.511: ICMPv6-ND: Address 2015:43AE::19/64 is down on Serial0/1
*Mar  1 00:11:03.515: ICMPv6-ND: Linklocal FE80::C000:2CFF:FEA8:0 on Serial0/1, Down
*Mar  1 00:11:03.515: ICMPv6-ND: Address FE80::C000:2CFF:FEA8:0/10 is down on Serial0/1

*Mar  1 00:11:05.499: %LINK-5-CHANGED: Interface Serial0/1, changed state to administrativelydown
*Mar  1 00:11:06.499: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
R1(config-if)#no shut

*Mar  1 00:11:14.247: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up
*Mar  1 00:11:14.251: ICMPv6-ND: Sending NS for FE80::C000:2CFF:FEA8:0 on Serial0/1
*Mar  1 00:11:15.255: ICMPv6-ND: DAD: FE80::C000:2CFF:FEA8:0 is unique.
*Mar  1 00:11:15.255: ICMPv6-ND: Sending NA for FE80::C000:2CFF:FEA8:0 on Serial0/1
*Mar  1 00:11:15.259: ICMPv6-ND: Linklocal FE80::C000:2CFF:FEA8:0 on Serial0/1, Up
*Mar  1 00:11:15.259: ICMPv6-ND: Address FE80::C000:2CFF:FEA8:0/10 is up on Serial0/1
*Mar  1 00:11:15.267: ICMPv6-ND: Sending NS for 2015:43AE::19 on Serial0/1

*Mar  1 00:11:15.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar  1 00:11:16.271: ICMPv6-ND: DAD: 2015:43AE::19 is unique.
*Mar  1 00:11:16.271: ICMPv6-ND: Sending NA for 2015:43AE::19 on Serial0/1
*Mar  1 00:11:16.275: ICMPv6-ND: Address 2015:43AE::19/64 is up on Serial0/1
R1(config-if)#do show ipv6 nei
R1(config-if)#

Can anyone please help?

3 Replies 3

Andrew Yourtchenko
Cisco Employee
Cisco Employee

What about non p2p interface ? E.g. Ethernet ?

Sent from Cisco Technical Support iPhone App

You are correct. Everything works fine on a LAN interface.

Thank you very much.

Why does it not work on a p2p interface?

Deepak Ambotkar
Level 1
Level 1

Steven,

You should see it for the ethernet segmet.

Regards,

Deepak Ambotkar