Juniper BGP Convergence Time

Wed May 16 14:32:27 UTC 2018

Erich,

Good Idea. I can't believe I didn't think of that earlier. Simple and
effective. I will go ahead and request the defaults from my ISP and update
the thread of the findings.

Thanks!

On Wed, May 16, 2018 at 10:03 AM Kaiser, Erich <erich at gotfusion.net> wrote:

> A last resort route (default route) could still be good to take from your
> ISP(s) even if you still do full routes, as the propagation is happening on
> the internet side, you should at least have a path inbound through the
> other provider.  The default route at least would send the traffic out if
> it does not see the route locally.  Just an idea.
>
>
>
> On Wed, May 16, 2018 at 8:22 AM, Adam Kajtar <akajtar at wadsworthcity.org>
> wrote:
>
> > 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
> > -----------------------------------------------------
> > 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
-----------------------------------------------------
http://www.wadsworthcity.com

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