Re: %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address f

athambi · ‎02-21-2011

Hello,

I have got a pair nexus 7000.It has got mutiple vlans enabled with ipv6 address .The vlans are trunked between the nexus

via a port channel.After enabling the nexus with ipv6 I am seeing the following messages .Any idea why

2011 Feb 21 06:05:35 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan116
2011 Feb 21 06:07:17 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan107
2011 Feb 21 06:32:52 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan107
2011 Feb 21 07:58:58 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan107
2011 Feb 21 08:40:44 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan120
2011 Feb 21 08:45:54 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan115
2011 Feb 21 08:51:59 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan117
2011 Feb 21 08:55:06 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan120
2011 Feb 21 08:55:27 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan118
2011 Feb 21 08:57:25 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan116
2011 Feb 21 08:57:57 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan115
2011 Feb 21 09:00:00 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan116
2011 Feb 21 09:00:11 bas2-1-cld.mw1 %ICMPV6-3-ND_LOG: icmpv6 [3486] Duplicate source address fe80::226:98ff:fe05:b641 detected on
Vlan119

Any ideas as what is causing this Duplicate source address messages ..

Aj

IAN WHITMORE · ‎02-21-2011

Can you trace the address fe80::226:98ff:fe05:b641 in the network? It's probably one of your Nexus...take a look.

Maybe you have a link flapping...or an HSRP config error.

Regards,

Ian

athambi · ‎02-21-2011

This is what I see from sw#1 and sw#2...

sw1# show ipv6 inter bri

IPv6 Interface Status for VRF "default"(1)

Interface IPv6 Address/Link-local Address Interface Status

prot/link/admin

Vlan102 fc07:0:0:1::1 up/up/up

fe80::226:98ff:fe05:b641

Vlan107 fc07:0:0:2::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan113 fc07:0:0:6::1 up/up/up

fe80::226:98ff:fe05:b641

Vlan114 fc07:0:0:7::1 up/up/up

fe80::226:98ff:fe05:b641

Vlan115 fc07:0:0:8::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan116 fc07:0:0:9::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan117 fc07:0:0:a::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan118 fc07:0:0:c::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan119 fc07:0:0:e::4 up/up/up

fe80::226:98ff:fe05:b641

Vlan120 fc07:0:0:f::4 up/up/up

fe80::226:98ff:fe05:b641

loopback0 fc07::fe up/up/up

fe80::226:98ff:fe05:b641

loopback1 fc07::ff up/up/up

fe80::226:98ff:fe05:b641

sw2#

IPv6 Interface Status for VRF "default"(1)
Interface        IPv6 Address/Link-local Address           Interface Status
                                                           prot/link/admin
Vlan102          fc07:0:0:1::1                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan107          fc07:0:0:2::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan113          fc07:0:0:6::1                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan114          fc07:0:0:7::1                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan115          fc07:0:0:8::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan116          fc07:0:0:9::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan117          fc07:0:0:a::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan118          fc07:0:0:c::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan119          fc07:0:0:e::4                             up/up/up
                 fe80::226:98ff:fe05:b641
Vlan120          fc07:0:0:f::4                             up/up/up
                 fe80::226:98ff:fe05:b641
loopback0        fc07::fe                                  up/up/up
                 fe80::226:98ff:fe05:b641
loopback1        fc07::ff                                  up/up/up
                 fe80::226:98ff:fe05:b641
sw2#

cadet alain · ‎02-21-2011

Hi,

You can force the link-local address under interface with this command: ipv6 add fe80::XX link-local.

Both your Nexus chose the same link-local addresses for each interface and so DAD( duplicate address detection is complaining).

Regards.

Alain.

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