[j-nsp] VRRP tuning and scaling

[Gard Undheim]

Correction:

300msec of course:)

Gard Undheim wrote:
> 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
=========================================