Hi What Junos version are you running, I have currently 100 vrrp groups, all with fast-interval 100msec. This config committed without any warnings. All vrrp-groups are under the same interface and unit. This is on a M5 running Junos 8.5.
Config: fe-0/2/2 { description to-3550; vlan-tagging; unit 99 { vlan-id 99; family inet { address 10.10.10.3/24 { vrrp-group 1 { virtual-address 10.10.10.1; priority 90; fast-interval 100; accept-data; } vrrp-group 10 { virtual-address 10.10.10.10; priority 90; fast-interval 100; accept-data; } vrrp-group 11 { virtual-address 10.10.10.11; priority 90; fast-interval 100; accept-data; } vrrp-group .. { virtual-address 10.10.10...; priority 90; fast-interval 100; accept-data; } vrrp-group 99 { virtual-address 10.10.10.99; priority 90; fast-interval 100; accept-data; } Regards, Gard Angel Bardarov wrote: > Hi, > When you configure "fast interval" you have limitation on number of VRRP > groups - it depends also on how "fast" is your interval: > > vrrp-group 250 { > virtual-address 1.1.1.252; > priority 105; > fast-interval 100; > preempt { > hold-time 300; > } > accept-data; > } > [edit interfaces ge-0/2/1 unit 2011 family inet address 1.1.1.3/24] > [EMAIL PROTECTED] commit check > [edit interfaces ge-0/2/1 unit 2011 family inet address 1.1.1.3/24] > 'vrrp-group 20' > Configuration exceeds maximum rate of 200 fast advertisements per second > error: configuration check-out failed > > With 100 ms interval the convergence is around 400 ms and you can't have > more than 20 groups. You can have more than 20 if these additional > groups don't use "fast interval" feature. > > Regards, > Angel > > > 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) >>>> [EMAIL PROTECTED] >>>> >>> http://www.speakeasy.net >>> -----Original Message----- >>> From: [EMAIL PROTECTED] >>> [mailto:[EMAIL PROTECTED] On Behalf Of alaerte vidali >>> Sent: Sunday, January 13, 2008 4:04 PM >>> To: juniper-nsp@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 <[EMAIL PROTECTED]> >>>> Subject: [j-nsp] VRRP tuning and scaling >>>> To: juniper-nsp@puck.nether.net >>>> Message-ID: <[EMAIL PROTECTED]> >>>> 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 >>>> >>>> >>>> >>>> >>> _______________________________________________ >>> juniper-nsp mailing list juniper-nsp@puck.nether.net >>> https://puck.nether.net/mailman/listinfo/juniper-nsp >>> _______________________________________________ >>> juniper-nsp mailing list juniper-nsp@puck.nether.net >>> https://puck.nether.net/mailman/listinfo/juniper-nsp >>> >> >> -- 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: [EMAIL PROTECTED] ========================================= _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp