[c-nsp] [j-nsp] Cisco and Juniper learning IPv6 neighbor different behavior

[sthaug at nethelp.no]

> Can share your configuration? 

Nothing special about it. IOS XR box:

interface GigabitEthernet0/5/0/2
 mtu 4484
 ipv4 address 172.17.9.1 255.255.255.0
 ipv6 address fd00:8c0:3::31/124
 negotiation auto
 dampening

#show ipv6 nei
IPv6 Address                              Age Link-layer Addr State Interface
fe80::207:84ff:fe23:38                   24   0007.8423.0038 REACH Gi0/5/0/0
fe80::207:84ff:fe22:fc1b                 17   0007.8422.fc1b REACH Gi0/5/0/1
fd00:8c0:3::32                           75   0013.c33a.f200 REACH Gi0/5/0/2
fe80::213:c3ff:fe3a:f200                 22   0013.c33a.f200 REACH Gi0/5/0/2

IOS box:

interface GigabitEthernet1/0/0
 dampening
 mtu 4470
 ip address 172.17.9.10 255.255.255.0
 no ip directed-broadcast
 negotiation auto
 ipv6 address FD00:8C0:3::32/124

#show ipv6 nei
IPv6 Address                              Age Link-layer Addr State Interface
FE80::5E5E:ABFF:FE08:CF79                   6 5c5e.ab08.cf79  STALE Gi1/0/3
FE80::21B:90FF:FECD:9D3B                    0 001b.90cd.9d3b  REACH Gi1/0/1
FE80::204:6DFF:FE98:E93D                    0 0004.6d98.e93d  REACH Gi1/0/0
FD00:8C0:3::31                              0 0004.6d98.e93d  REACH Gi1/0/0

Steinar Haug, Nethelp consulting, sthaug at nethelp.no