Juniper BGP Convergence Time

Wed May 16 13:22:54 UTC 2018

I could use static routes but I noticed since I moved to full routes I have
had a lot fewer customer complaints about latency(especially when it comes
to Voice and VPN traffic).

I wasn't using per-packet load balancing. I believe juniper default is per
IP.

My timers are as follows
 Active Holdtime: 90
 Keepalive Interval: 30

Would I be correct in thinking I need to contact my ISP to lower these
values?

An interesting note is when I had both ISPs connected into a single MX104
the failover was just a few seconds.

Thanks again.

On Tue, May 15, 2018 at 8:42 PM Ben Cannon <ben at 6by7.net> wrote:

> Have you checked your timeouts ?
>
> -Ben
>
> > On May 15, 2018, at 4:09 PM, Kaiser, Erich <erich at gotfusion.net> wrote:
> >
> > Do you need full routes?  What about just a default route from BGP?
> >
> > Erich Kaiser
> > The Fusion Network
> > erich at gotfusion.net
> > Office: 815-570-3101
> >
> >
> >
> >
> >> On Tue, May 15, 2018 at 5:38 PM, Aaron Gould <aaron1 at gvtc.com> wrote:
> >>
> >> You sure it doesn't have something to do with 60 seconds * 3 = 180 secs
> of
> >> BGP neighbor Time out before it believes neighbor is dead and remove
> routes
> >> to that neighbor?
> >>
> >> Aaron
> >>
> >>> On May 15, 2018, at 9:10 AM, Adam Kajtar <akajtar at wadsworthcity.org>
> >> wrote:
> >>>
> >>> Hello:
> >>>
> >>> I'm running two Juniper MX104s. Each MX has 1 ISP connected running
> >>> BGP(full routes). iBGP is running between the routers via a two port
> 20G
> >>> lag. When one of the ISPs fails, it can take upwards of 2 minutes for
> >>> traffic to start flowing correctly. The router has the correct route in
> >> the
> >>> routing table, but it doesn't install it in the forwarding table for
> the
> >>> full two mins.
> >>>
> >>> I have a few questions if anyone could answer them.
> >>>
> >>>  - What would a usual convergence time be for this setup?
> >>>  - Is there anything I could do speed this process up? (I tried
> >> Multipath)
> >>>  - Any tips and tricks would be much appreciated
> >>>
> >>> Thanks in Advance
> >>> --
> >>> Adam Kajtar
> >>> Systems Administrator
> >>> City of Wadsworth
> >>> akajtar at wadsworthcity.org
> >>> -----------------------------------------------------
> >>> http://www.wadsworthcity.com
> >>>
> >>> Facebook <http://www.facebook.com/cityofwadsworth>* |* Twitter
> >>> <https://twitter.com/CityOfWadsworth> *|* Instagram
> >>> <https://www.instagram.com/cityofwadsworth/> *|* YouTube
> >>> <https://www.youtube.com/channel/UCymlH-AZgvxTaHtgp3-AmDQ>
> >>
> >>
>

-- 
Adam Kajtar
Systems Administrator, Safety Services
City of Wadsworth
Office 330.335.2865
Cell 330.485.6510
akajtar at wadsworthcity.org
-----------------------------------------------------
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