[j-nsp] VRRP tuning and scaling

[Gard Undheim]

Hi

Thanks for the answers. I have tested a bit with up to 75 vrrp-groups
and a interval of 100msec in the lab now, and the boxes is not able to
to the failover in the expected time (300-400msec). These tests were
done with two M5's, the actual network will use M120 and M320. I guess
I'll set the interval to 300 seconds, since this is also what is
recommended in the 8.5 release notes.

Regards,
Gard

Jonathan Brashear wrote:
> 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
>> 214-981-1954 (office) 
>> 214-642-4075 (cell)
>> jbrashear at hq.speakeasy.net 
> http://www.speakeasy.net
> -----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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-- 

Best Regards,
Gard Undheim
-----------------------------------------
Systems Engineer, Network Solutions
IPnett AS
-----------------------------------------
Phone:  +47 67 20 10 10 (Direct -63)
Fax:    +47 67 20 10 11
Mobile: +47 97 72 86 71
Email:  gard at ipnett.no
=========================================