Hi Guys,
I'm hoping there is someone out there who knows a bit more about IPv6 that I do
:)
Enabled ipv6 between the Cisco 7600 running 12.2(33)SRE and a pair of Cisco ASA
firewalls running 8.2(2) (in HA). I get the following from the 7600
%IPV6-3-CONFLICT: Router FE80::21A:E2FF:FE68:50AA on Vlan2008 has conflicting
ND settings
"show ipv6 routers" show the only real difference is the retransmit time. On
the 7600, it is 0ms (which I understand to be "unspecified" rather than 0) and
on the ASA the default is 1000.
cr1-sdf2.uk#show ipv6 routers vlan2008
Router FE80::21A:E2FF:FE68:50AA on Vlan2008, last update 0 min, CONFLICT
Hops 64, Lifetime 1800 sec, AddrFlag=0, OtherFlag=0, MTU=1500
HomeAgentFlag=0, Preference=Medium
Reachable time 0 msec, Retransmit time 1000 msec
Prefix 2A02:298:0:4::/112 onlink autoconfig
Valid lifetime 2592000, preferred lifetime 604800
colofw1/act# show ipv6 routers
Router fe80::21b:dff:fee5:ae00 on outside, last update 0 min
Hops 64, Lifetime 1800 sec, AddrFlag=0, OtherFlag=0, MTU=1500
Reachable time 0 msec, Retransmit time 0 msec
Prefix 2a02:298:0:4::/112 onlink autoconfig
Valid lifetime 2592000, preferred lifetime 604800
Adding the following configuration to the 7600 corrects the issue:
ipv6 nd ns-interval 1000
cr1-sdf2.uk(config-if)#do show ipv6 routers vlan2008
Router FE80::21A:E2FF:FE68:50AA on Vlan2008, last update 0 min
Hops 64, Lifetime 1800 sec, AddrFlag=0, OtherFlag=0, MTU=1500
HomeAgentFlag=0, Preference=Medium
Reachable time 0 msec, Retransmit time 1000 msec
Prefix 2A02:298:0:4::/112 onlink autoconfig
Valid lifetime 2592000, preferred lifetime 604800
Both ends are now the same and no conflict occurs. Any ideas why it's
complaining? I thought that the unspecified nature of ns-interval means that it
would accept the 1000 milliseconds from the other end?
Thanks
Tim
Timothy Arnold
Senior Engineer, Operations (Network, Security & Facilities Group), UKSolutions
Telephone: 0845 004 1333, option 2
Email: [email protected]
Web: www.uksolutions.co.uk<http://www.uksolutions.co.uk/>
UKS Ltd, Birmingham Road, Studley, Warwickshire, B80 7BG Registered in England
Number 3036806
This email must be read in conjunction with the legal & service notices on
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