Juniper BGP Convergence Time

Sat May 26 16:14:17 UTC 2018

Add a static default route on both routers. This will be invalidated as
soon the interface goes down. Should be faster than relying on the BGP
process on withdrawing the route. Also does not require any config changes
at your upstreams.

Regards
Baldur

ons. 16. maj 2018 18.52 skrev Adam Kajtar <akajtar at wadsworthcity.org>:

> 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
>
> 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>
>