[j-nsp] VRRP tuning and scaling

[Jonathan Brashear]

Seconded.  Depending on what type of Juniper you're using, VRRP issues
can heavily tax a router and cause it to drop bgp with other routers if
enough problems pop up.  Dropping the fast-interval time will only
hasten these problems.  It's your call, but imo it's a
high-risk/low-reward situation tuning the failover to the lowest time
possible. 


Network Engineer
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-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of alaerte vidali
Sent: Sunday, January 13, 2008 4:04 PM
To: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] VRRP tuning and scaling

Hi,

I believe you will face scalability issues, even though I can only
affirm
this 100% in Cisco.

I suggest you consider not only normal periods of the network. In this
case
probably it is ok.
But add to this all process you have, plus things like instabilities in
network (STP issues, link flapping...).
Then everything together can result in routers losing track of VRRP
neighbor
packets due to the large number.

Br,
Alaerte

>
>
>
> Today's Topics:
>
>   1. VRRP tuning and scaling (Gard Undheim)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 12 Jan 2008 18:15:58 +0100
> From: Gard Undheim <gard at ipnett.no>
> Subject: [j-nsp] VRRP tuning and scaling
> To: juniper-nsp at puck.nether.net
> Message-ID: <4788F5CE.5090905 at ipnett.no>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> Hi
>
> I am currently tuning VRRP to speed up the failover time. I have set
the
> fast-interval to 100msec, which is a minimum. Does anyone know how
these
> settings scale with different numbers of vrrp groups? The customer
> currently has 20 vrrp groups, but would it also work fine with as much
> as 255 groups and fast interval of 100msec?
>
>
> Thanks for any help!
>
> Best Regards,
> Gard
>
>
>
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