[c-nsp] IPv6 ns-interval & 12.2(33)SRE & ASA 8.2(2)

[harbor235]

Tim,

I got the following of from Cisco pertaining to your error message;


Explanation    Another router on the link has sent router advertisements
with parameters that conflict with this router.

Recommended Action    Verify that all IPv6 routers on the link have the same
parameters in the router advertisement for hop-limit, managed-config-flag,
other-config-flag, reachable-time and ns-interval. Also verify that
preferred and valid lifetimes for the same prefix advertised by several
routers are the same. Enter the *show ipv6 interface* command to list the
parameters per interface.
mike

On Wed, Jan 13, 2010 at 7:31 AM, Timothy Arnold <
timothy.arnold at uksolutions.co.uk> wrote:

> 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 <http://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: timothy.arnold at uksolutions.co.uk
> Web: www.uksolutions.co.uk<http://www.uksolutions.co.uk/>
> UKS Ltd, Birmingham Road, Studley, Warwickshire, B80 7BG Registered in
> England Number 3036806
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