From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Mon Apr 09 2007 - 09:48:28 ART
Hi.
I think the timer you are looking for is
glbp NNN timers redirect <secs>
With this AVG stops advertising MAC address of the failed AVF after
<secs>, so setting this to 0 would make a preempting forwarder to act
immediately with its own MAC. Failed MAC will still be served according
to TTL period since ARP caches take place on clients' side.
Regarding "60 seconds delay before resuming the active forwarder role"
glbp NNN forwarder preempt delay minimum <secs>
would probably do the job.
HTH,
A.
nhatphuc wrote:
> 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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