From: dara tomar (wish2ie@gmail.com)
Date: Mon Jun 16 2008 - 09:43:36 ART
*Thanks Victor,
I would reverify that, as that was per my previous observation.
Thanks again,
Regards,
Dara*
On Mon, Jun 16, 2008 at 1:19 AM, Victor Cappuccio <vcappuccio@gmail.com>
wrote:
> Dara,
>
>
> http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_8-2/ipv6.html
>
> The address family within MPBGP is modular to facilitate distinct peering
> relationships, and is expressed using the *Address Family Identifier*(AFI). The regular BGP capabilities are exchanged after the peering sessions
> are turned on. In order for two provider edge routers to exchange labeled
> IPv6 VPN prefixes, they must use BGP capabilities negotiation to ensure that
> they both are capable of processing such information.
>
> if they do not agree on the same advertised and received capabilities, they
> would stuck in that state.
>
>
> Best Regards
> Victor.-
>
>
> On Sun, Jun 15, 2008 at 9:22 PM, dara tomar <wish2ie@gmail.com> wrote:
>
>> *Yeah,
>>
>> Piyoush is right here!!
>>
>
>> This is due the address family negotiation with the mpBGP capabilities,
>> the
>> address family isn't negotiated and it is indicated.
>> Some of the Cisco IOS codes response like this for the address-family not
>> negotiated between the peers, with the later IOS codes this has been
>> removed.
>>
>>
>> Cheers,
>> Dara
>> *
>> On Mon, Jun 16, 2008 at 12:31 AM, Piyoush Sharma <piyoush@gmail.com>
>> wrote:
>>
>> > It means thats the router is advertising address family (ipv6 in this
>> case)
>> > and the other side (BB3) is not configured for it... hence the
>> > Noneg(otiate).. as in cannot/could not negotiate...
>> > I've mostly seen this with VPNv4 configs
>> >
>> > Piyoush.
>> >
>> > On Sun, Jun 15, 2008 at 11:48 AM, Victor Cappuccio <
>> vcappuccio@gmail.com>
>> > wrote:
>> >
>> > > what does show bgp ipv6 unicast neighbors 2001:204:12:1::254 say about
>> > the
>> > > capabilities advertised and received?
>> > >
>> > > Thanks
>> > > --
>> > > Victor Cappuccio
>> > > www.vcappuccio.wordpress.com
>> > >
>> > > On Sun, Jun 15, 2008 at 8:34 PM, Shahnawaz Khot <
>> > shahnawaz4ccie@gmail.com>
>> > > wrote:
>> > >
>> > > > Hi ,
>> > > >
>> > > > In our IE practice labs we found one bgp peering session from router
>> R4
>> > > to
>> > > > BB3 as following.
>> > > >
>> > > >
>> > > >
>> > > > Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ
>> > > Up/Down
>> > > > State/PfxRcd
>> > > > 2001:204:12:1::254 4 54 42 42 0
>> 0
>> > > 0
>> > > > 00:10:41 (*NoNeg)*
>> > > >
>> > > > State *Noneg* is bit confusing for me. I have not seen this before.
>> I
>> > > have
>> > > > no right view from web as well, please help.
>> > > >
>> > > >
>> > > > Regards,
>> > > > Shahnawaz
>> > > >
>> > > >
>> > > >
>> _______________________________________________________________________
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>> > >
>> > >
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>> >
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>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>
>
> --
> Victor Cappuccio
> CCIE R/S# 20657
> CCSI# 30452
> www.vcappuccio.wordpress.com
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