<div dir="ltr">RSVP could create significant administrative overhead. Are you using auto tunnel or automesh, or some scripting?<div style>BBA with PPPoE, nice for hub-and-spoke topology and very ISP-ish. ^_^</div><div><br>
</div><div style>Discussed this briefly with my colleague, and come up with following:</div><div style><br></div><div>BGP with dual RR. Can use BFD where needed for need fast convergence.</div><div>If this is an all Cisco shop, then DMVPN.</div>
<div>IS-IS is nice as doesn't rely on IP, but not supported on many low end routers.</div><div>OSPF is ok, but consider the CPU requirements, especially if using IPv6 as well.</div><div><br></div><div><br></div><div>Cheers,<br>
</div><div>Jules<br><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Apr 17, 2013 at 10:45 AM, Matt Carter <span dir="ltr"><<a href="mailto:mattc@mansol.net.au" target="_blank">mattc@mansol.net.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-AU" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">What about MPLS-TE ?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><br>
…Consider BGP has no understanding of interface bandwidth, in reality it barely knows anything about where traffic should go and hides non-best-path information, passing only along the “best route” where advertising a second path forces a withdrawl of the first.
This is a inherent problem if you want flexibility & scale, using an underlying IGP (ISIS/OSPF) and something like RSVP allows a full end to end path to be built with consideration for the bandwidth & available paths end to end, every router has a copy of
the TE traffic engineering database. (no loops possible.) …… BGP MEDs on scale don’t really help much for the pain they impose (anyone?) and you tend to find a closest-exit regime anyway.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">In short, BGPs ability to manipulate traffic in an MPLS environment is limited, it may be great for exchanging edge information using multiprotocol extensions
offered by BGP, but for the core transport you really want to leverage off the TE capabilities provided by ISIS or OSPF.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At the very least this lets you adjust your network and service offering based on things like throughput and delay, bandwidth and paths available in the underlying
core network, which you simply can’t get by doing a simple “virtual-mesh” topology using l2 switching vlans / QinQs etc creating shortcuts everywhere to make routers appear to be 1 hop from each other. There’s no/little feedback or dynamic capability from
the underlying network architecture in that model without relying on STP or multiple shortcut vlans, messy messy messy.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My 2c.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a> [mailto:<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>]
<b>On Behalf Of </b>Johann Lo<br>
<b>Sent:</b> Wednesday, 17 April 2013 10:09 AM<br>
<b>To:</b> Tom Storey</span></p><div><div class="h5"><br>
<b>Cc:</b> <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] VPLS OSPF question<u></u><u></u></div></div><p></p>
</div>
</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">True. I guess I misunderstood your question.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">But I’d just K.I.S.S. and split the VPLS into VLANs (one for each state etc.) and then run each as an OSPF area. I’d assume with a VPLS cloud that size you’d
have Q-in-Q. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The real impetus with deploying BGP would be if you want to run MPLS and VRFs internally but even then you could get away with VLANs and VRF-lite and leak routes
via real devices e.g. inter VRF aggregation firewalls. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">There’s also operational overhead, good luck getting any decent troubleshooting out of the lower levels before it escalates to senior. Ditto with implementations.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I’ve had a very bad experience with an extremely complex, BGP as internal topology network with 27 VRFs and multiple points of redistribution, any routing change
turned into a CCIE lab. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Tom Storey [<a href="mailto:tom@snnap.net" target="_blank">mailto:tom@snnap.net</a>]
<br>
<b>Sent:</b> Wednesday, 17 April 2013 9:51 AM<br>
<b>To:</b> Johann Lo<br>
<b>Cc:</b> Mitchell Warden; <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] VPLS OSPF question<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">Im aware iBGP generally requires an IGP as well, to distribute loopback information at a minimum, and that is is generally slower to propagate updates than the likes of an IGP - thats all 101 stuff.<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">What I dont get is why this would make BGP any less useful internally. I mean, if I had to peer 200 sites across a VPLS I'd probably do it with some form of BGP rather than an IGP.<u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
<div>
<p class="MsoNormal">On 17 April 2013 00:05, Johann Lo <<a href="mailto:Johann.Lo@aptel.com.au" target="_blank">Johann.Lo@aptel.com.au</a>> wrote:<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">No, not really…. Why do you think most people run their iBGP on top of something else?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Also BGP convergence time is inferior to OSPF/EIGRP/ISIS</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a> [mailto:<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>]
<b>On Behalf Of </b>Tom Storey<br>
<b>Sent:</b> Wednesday, 17 April 2013 4:40 AM<br>
<b>To:</b> Mitchell Warden</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><br>
<b>Cc:</b> <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] VPLS OSPF question<u></u><u></u></p>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<p class="MsoNormal">Whats wrong with using BGP internally. Isnt that what iBGP is for?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"> <u></u><u></u></p>
<div>
<div>
<p class="MsoNormal">On 16 April 2013 10:34, Mitchell Warden <<a href="mailto:wardenm@wardenm.net" target="_blank">wardenm@wardenm.net</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Hi Brad,<br>
<br>
Some ideas below. There are a lot of considerations...<br>
<br>
OSPF<br>
- Will run fine on a VPLS service. I've done this with up to 30 or so sites in the past and it works well.<br>
- 200 is a lot of sites - I would try to break it down to multiple smaller domains.<br>
- 50 routers in an area isn't a big deal. It will depend on the CPU and the number of updates, but even 200 is unlikely to be a problem. <br>
- 200 neighbour adjacencies however might be a big deal (they're all on the same broadcast domain). I think 200 is too many.<br>
<br>
BGP<br>
- All of the routers could be in the same subnet so they would be able to reach each other directly without an IGP, if you build neighbors with interface addresses instead of loopbacks.<br>
- You would need to use route reflectors to avoid having to mesh all 200 routers.<br>
- I can't think of any reason BGP would reduce available bandwidth.<br>
- BGP isn't really designed to be used internally, and I would try to avoid using it that way.<br>
- BGP is probably better than OSPF if you can't reduce the size of the domain. It will be more scalable and probably more reliable.<br>
<br>
Cheers.<br>
Mitchell<u></u><u></u></p>
</div>
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<br>
----- Original Message -----<br>
From: Brad McGinn<br>
[mailto:<a href="mailto:the_xorach@yahoo.com" target="_blank">the_xorach@yahoo.com</a>]<br>
To: <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><br>
[mailto:<a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a>]<br>
Sent: Tue, 16 Apr 2013 17:14:02<br>
+1000<br>
Subject: [AusNOG] VPLS OSPF question<br>
<br>
<br>
> Hi AusNog list,<br>
<br>
Long time listener, first or second time caller.<br>
<br>
I<br>
> know this list is pretty specific to Service Providers so I'm hoping any of<br>
> you who not only know carrier networks, but also have an insight into<br>
> enterprise networks maybe able to help me to get a view (or even help<br>
> understanding) of the pros and cons of running OSPF or BGP across a VPLS<br>
> network. <br>
<br>
I respectfully ask your advice. <br>
<br>
I am an enterprise<br>
> network engineer, not a service provider however I hope you don't hold that<br>
> against me. We run OSPF in our Data Centre and BGP into a MPLS network<br>
> that all of our sites connect into.<br>
<br>
My fairly basic understanding of VPLS<br>
> is kind of like EoMPLS or even one big broadcast domain. I assume any<br>
> IGP could potentially work across it but some factors must be taken into<br>
> consideration: eg flapping sites, latency, reference bandwidth, DR/BDR<br>
> placement, multicast transmission and so on.<br>
<br>
So, with that in mind, I'm<br>
> wondering the following:<br>
- would it be wise to run an IGP across a<br>
> VPLS backbone with over 200 sites? or would BGP be better? or even something<br>
> else?<br>
- if an IGP is the go, would one use OSPF?<br>
- if OSPF, do<br>
> you think it would be wiser to run a separate OSPF process for the VPLS<br>
> connected sites and a separate OSPF process for the DC? and then<br>
> redistribute or just summarise right there? (so as to protect the DC from<br>
> OSPF recalculations when sites go up and down)<br>
- if BGP would be the<br>
> go I'm wondering how one might go about it.. I know that all iBGP<br>
> neighbours must have a route to the peering IP of all other iBGP routers so<br>
> I would assume an IGP must be run anyway???<br>
- cisco say that<br>
> anything more than 50 routers on an area is a bad idea, so if I have over<br>
> 200 sites potentially on the VPLS, will OSPF cut it?<br>
<br>
I guess i'm just<br>
> trying to get my head around the different technology. I'd love to keep<br>
> the stability that BGP brings, but also would like to be able to make use<br>
> of the bandwidth that VPLS gives.<br>
<br>
Any hints or tips will be gratefully<br>
> received and thank you for any help. If you would like to keep from<br>
> cluttering up subscriber's inboxes, please reply offlist.<br>
<br>
Again, thanks<br>
> for any help.<br>
<br>
Regards,<br>
<br>
Brad David<u></u><u></u></p>
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