From: nhatphuc (nhatphuc@gmail.com)
Date: Sat Apr 07 2007 - 11:00:55 ART
Hi Josef,
The secondary AVF may not necessarily be the AVG. If this is the case and
AVG is configured with glbp 1 forwarder preempt delay minimum 0. So how does
the secondary AVF become active immediately after the 1st down?
Thanks
Phuc
On 4/7/07, Josef A <josefnet@gmail.com> wrote:
>
>
> Dear Phuc,
>
> This is my opinion on this:
>
> Bear in mind that there can be more than 2 routers in a glbp group, and
> that the router that is actively forwarding traffic for a particular glbp
> group mac address is the AVF - the Active Virtual Forwarder for that mac
> address.
>
> The AVG is the Active Virtual Gateway - is the router that shares the
> different glbp mac addresses amongst the AVFs. The AVG itself can also be an
> AVF for a mac address. GLBP allows up to four virtual mac addresses per
> group.
>
> The documentation says that if the AVF fails, one of the secondary virtual
> forwarders in the listen state will assume the responsibilty for the
> virtual mac address. This secondary AVF may not necessarily be the AVG.
>
> The first part of your requirement states that if the interface goes down
> ensure traffic is still forwarded without any delay:
>
> Initially we must track the appropriate interface on the Primary
> Forwarder, and set weighting values. If the interface goes down, the weight
> will be decremented. As soon this occurs, we want the secondary virtual
> forwarder to preempt the primary and starts forwarding packets for that mac
> address:
>
> We will configure on the secondary virtual forwarder:
>
> glbp 1 forwarder preempt delay minimum 0
>
> The second part of your requirement states that: When the interface comes
> back up, we want to resume the active forwarder role in 60s.
>
> We will configure on the Primary forwarder:
>
> glbp 1 forwarder preempt delay minimum 60.
>
> Note that the command: glbp 1 preempt delay min 0: actually configures
> preemption for the AVG, but the AVG might not be the router forwarding
> traffic for the mac address we are using.
>
> Just my 2 cents.
>
> thx
>
>
>
>
> On 4/3/07, nhatphuc <nhatphuc@gmail.com> wrote:
>
> > Hi Group,
> >
> > I want to configure tracking in GLBP as follow:
> >
> > when the interface goes down, ensure traffic is still forwarded without
> > any
> > delay. So I configure: glbp 1 preempt delay min 0
> > But when the interface goes up, I want 60 seconds delay before resuming
> > the
> > active forwarder role (for routing convergence). How do I configure?
> >
> > Thanks
> >
> > Phuc
> >
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