02-21-2011 03:23 AM - edited 03-06-2019 03:39 PM
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
02-21-2011 03:54 AM
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
02-21-2011 04:04 AM
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#
02-21-2011 05:51 AM
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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