Should I add a default route to multi ISP BGP
Hi all, I presently have a single ISP with full routes in my core router. I did have, and will soon have again an IX connection. We and importantly our customers have had a problem with the web site nperf.com specifically we could not get a route to cdn.nperf.com. I added a static route just to get it working, My question is, should I or is it best practice to add a default route 0.0.0.0/0 to my ISP to catch any missing routes in my BGP? Thanks in advance, *Malcolm Faed.* Broadcast Network Engineer *Av-Comm* avcomm.com.au malcolm@avcomm.com.au 24/9 Powells Road, Brookvale, NSW 2100, Australia P: +61 (2) 9939 4377 M: +61 409 601 747 [image: Twitter] <https://twitter.com/AvCommSatellite> <https://plus.google.com/+AvcommAustralia/>[image: Youtube] <https://www.youtube.com/channel/UCO8ZtcnwoTH7e54LAndE-yw>[image: Linkedin] <https://www.linkedin.com/company-beta/6583589/> This e-mail message may contain confidential or legally privileged information and is intended only for the use of the intended recipient(s). Any unauthorised disclosure, dissemination, distribution, copying or the taking of any action in reliance on the information herein is prohibited. E-mails are not secure and cannot be guaranteed to be error free as they can be intercepted, amended, or contain viruses. Anyone who communicates with us by e-mail is deemed to have accepted these risks. Av-Comm is not responsible for errors or omissions in this message and denies any responsibility for any damage arising from the use of e-mail. Any opinion and other statement contained in this message and any attachment are solely those of the author and do not necessarily represent those of the company.
Hi Mal, Best to just ask for both uplink peers to advertise default route to you and then use routing filters to prioritise which peer you want as primary. This has the advantage of allowing for automated default fail-over if something goes wrong with either peer. Cheers! Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Malcolm Faed Sent: Sunday, 28 June 2020 5:19 PM To: MikroTik Australia Public List <public@talk.mikrotik.com.au> Subject: [MT-AU Public] Should I add a default route to multi ISP BGP
Hi all,
I presently have a single ISP with full routes in my core router. I did have, and will soon have again an IX connection.
We and importantly our customers have had a problem with the web site nperf.com specifically we could not get a route to cdn.nperf.com.
I added a static route just to get it working,
My question is, should I or is it best practice to add a default route 0.0.0.0/0 to my ISP to catch any missing routes in my BGP?
Thanks in advance,
*Malcolm Faed.* Broadcast Network Engineer
*Av-Comm* avcomm.com.au malcolm@avcomm.com.au 24/9 Powells Road, Brookvale, NSW 2100, Australia P: +61 (2) 9939 4377 M: +61 409 601 747
[image: Twitter] <https://twitter.com/AvCommSatellite> <https://plus.google.com/+AvcommAustralia/>[image: Youtube] <https://www.youtube.com/channel/UCO8ZtcnwoTH7e54LAndE-yw>[image: Linkedin] <https://www.linkedin.com/company-beta/6583589/>
This e-mail message may contain confidential or legally privileged information and is intended only for the use of the intended recipient(s). Any unauthorised disclosure, dissemination, distribution, copying or the taking of any action in reliance on the information herein is prohibited. E-mails are not secure and cannot be guaranteed to be error free as they can be intercepted, amended, or contain viruses. Anyone who communicates with us by e-mail is deemed to have accepted these risks. Av-Comm is not responsible for errors or omissions in this message and denies any responsibility for any damage arising from the use of e-mail. Any opinion and other statement contained in this message and any attachment are solely those of the author and do not necessarily represent those of the company. _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
Definitely having your ISP advertise you the default route is a good idea because, as Mike says, it allows for failover (assuming you have more than one provider). You should probably also still include a static default route (as a "gateway of last resort") in addition to the ones learned by BGP and configured in such a way that it only gets picked up should you have no default from your ISPs. Setting the distance to 250 on the statically configured route would probably do it. If you only have one transit provider + some peering then you should consider if it makes sense to receive a full table at all?. Just having your ISP/Transit provider send you a default route + the routes you receive from IX peering means a lot less routes in your table, easier to manage and with no difference in functionality. Full tables only make sense if you have multiple upstream transit providers and want the ability to preference outbound routes/engineer outbound traffic on them. Shane www.caznet.com.au Leave us a review on Google: g.page/Caznet/review <http://g.page/Caznet/review> On 28/6/20, 5:24 pm, "Public on behalf of Mike Everest" <public-bounces@talk.mikrotik.com.au on behalf of mike@duxtel.com> wrote: Hi Mal, Best to just ask for both uplink peers to advertise default route to you and then use routing filters to prioritise which peer you want as primary. This has the advantage of allowing for automated default fail-over if something goes wrong with either peer. Cheers! Mike. > -----Original Message----- > From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of > Malcolm Faed > Sent: Sunday, 28 June 2020 5:19 PM > To: MikroTik Australia Public List <public@talk.mikrotik.com.au> > Subject: [MT-AU Public] Should I add a default route to multi ISP BGP > > Hi all, > > I presently have a single ISP with full routes in my core router. > I did have, and will soon have again an IX connection. > > We and importantly our customers have had a problem with the web site > nperf.com specifically we could not get a route to cdn.nperf.com. > > I added a static route just to get it working, > > My question is, should I or is it best practice to add a default route > 0.0.0.0/0 to my ISP to catch any missing routes in my BGP? > > Thanks in advance, > > *Malcolm Faed.* > Broadcast Network Engineer > > *Av-Comm* > avcomm.com.au > malcolm@avcomm.com.au > 24/9 Powells Road, Brookvale, NSW 2100, Australia > P: +61 (2) 9939 4377 > M: +61 409 601 747 > > [image: Twitter] <https://twitter.com/AvCommSatellite> > <https://plus.google.com/+AvcommAustralia/>[image: Youtube] > <https://www.youtube.com/channel/UCO8ZtcnwoTH7e54LAndE-yw>[image: > Linkedin] <https://www.linkedin.com/company-beta/6583589/> > > This e-mail message may contain confidential or legally privileged > information and is intended only for the use of the intended recipient(s). > Any unauthorised disclosure, dissemination, distribution, copying or the > taking of any action in reliance on the information herein is prohibited. > E-mails are not secure and cannot be guaranteed to be error free as they can > be intercepted, amended, or contain viruses. Anyone who communicates > with us by e-mail is deemed to have accepted these risks. Av-Comm is not > responsible for errors or omissions in this message and denies any > responsibility for any damage arising from the use of e-mail. Any opinion and > other statement contained in this message and any attachment are solely > those of the author and do not necessarily represent those of the company. > _______________________________________________ > Public mailing list > Public@talk.mikrotik.com.au > http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au _______________________________________________ Public mailing list Public@talk.mikrotik.com.au http://talk.mikrotik.com.au/mailman/listinfo/public_talk.mikrotik.com.au
participants (3)
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Malcolm Faed -
Mike Everest -
Shane Clay