Re: Need a little BGP address-family help

What Carlos said makes sense. In example 1, even though the underlying TCP
connection is built using IPv6 at L3, by default it will activate an IPv4
address-family session. In other words, the IPv6 built TCP connection
would be used to carry IPv4 prefix information by default. When you say no
neighbor x activate globally, it is disabling that functionality because it
disables the IPv4 address family for that specific neighbor.

On Sat, Jan 11, 2014 at 3:31 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> When declared in the "global" area, neighbors are activated in IPv4 by
> default.
> If you declare the neighbor in the IPv6 AF, it gets "deactivated" in
> IPv4. Makes sense ?
>
> Andrew LaPorte @ 11/01/2014 17:09 -0300 dixit:
> > Hi,
> >
> > I'm reviewing my IPv6 BGP I'm trying to understand the difference in
> these
> > two output:
> >
> > #1
> >
> > ------------------------------------
> >
> > router bgp 200
> > no synchronization
> > bgp router-id 150.1.1.1
> > bgp log-neighbor-changes
> > neighbor 2001:CC1E:1::3 remote-as 300
> > no neighbor 2001:CC1E:1::3 activate
> > no auto-summary
> > !
> > address-family ipv6
> > neighbor 2001:CC1E:1::3 activate
> > exit-address-family
> >
> > #2
> >
> > -------------------------------------
> >
> > router bgp 200
> > no synchronization
> > bgp router-id 150.1.1.1
> > bgp log-neighbor-changes
> > neighbor 2001:CC1E:1::3 remote-as 300
> > no auto-summary
> > !
> > address-family ipv6
> > neighbor 2001:CC1E:1::3 activate
> > exit-address-family
> >
> >
> >
> > #1 was created by just going under the ipv6 address-family and adding a
> > neighbor whereas in #2 the neighbor was add under the main process and
> also
> > activated the address-family.
> >
> > If someone could please help out by explaining what the "no neighbor
> > 2001:CC1E:1::3 activate" under #1 in the main BGP process does as I'm a
> bit
> > confused as to what action it performs
> >
> > Thanks,
> >
> > AndyL.
> >
> >
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> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
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