From: Josef A (josefnet@gmail.com)
Date: Fri Apr 06 2007 - 20:53:41 ART
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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