<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt">Hi All,<br><br>Thanks loads for the information, there is a lot to digest. <br><br>I'll try to put all the information in a succinct format and post a summary shortly. Meanwhile, any more information is welcome.<br><br>Thanks again!<br><br>Brad<br><div><span><br></span></div><div><br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Brad Gould <bradley@internode.com.au><br> <b><span style="font-weight: bold;">To:</span></b> Brad McGinn <the_xorach@yahoo.com> <br><b><span style="font-weight: bold;">Cc:</span></b> "ausnog@lists.ausnog.net" <ausnog@lists.ausnog.net> <br> <b><span
style="font-weight: bold;">Sent:</span></b> Thursday, 18 April 2013, 10:51<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [AusNOG] VPLS OSPF question<br> </font> </div> <div class="y_msg_container"><br>Why are you going down the VPLS path/topology?<br><br>VPLS is primarily for Layer 2 connectivity between sites - transporting vlans to various sites, it doesnt sound like thats what you require.<br><br>It sounds like what you actually want is an Layer 3 MPLS VPN. At each site you run an IGP or iBGP to the service provider, who emulates your core network aka "the MPLS VPN", and your done.<br><br><br>Brad<br><br><br>On 16/04/2013 4:44 PM, Brad McGinn wrote:<br>> Hi AusNog list,<br>> Long time listener, first or second time caller.<br>> I know this list is pretty specific to Service Providers so I'm hoping<br>> any of you who not only know carrier networks, but also have an insight<br>> into enterprise networks maybe
able to help me to get a view (or even<br>> help understanding) of the pros and cons of running OSPF or BGP across a<br>> VPLS network.<br>> I respectfully ask your advice.<br>> I am an enterprise network engineer, not a service provider however I<br>> hope you don't hold that against me. We run OSPF in our Data Centre and<br>> BGP into a MPLS network that all of our sites connect into.<br>> My fairly basic understanding of VPLS is kind of like EoMPLS or even one<br>> big broadcast domain. I assume any IGP could potentially work across it<br>> but some factors must be taken into consideration: eg flapping sites,<br>> latency, reference bandwidth, DR/BDR placement, multicast transmission<br>> and so on.<br>> So, with that in mind, I'm wondering the following:<br>> - would it be wise to run an IGP across a VPLS backbone with over 200<br>> sites? or would BGP be better? or even
something else?<br>> - if an IGP is the go, would one use OSPF?<br>> - if OSPF, do you think it would be wiser to run a separate OSPF<br>> process for the VPLS connected sites and a separate OSPF process for the<br>> DC? and then redistribute or just summarise right there? (so as to<br>> protect the DC from OSPF recalculations when sites go up and down)<br>> - if BGP would be the go I'm wondering how one might go about it.. I<br>> know that all iBGP neighbours must have a route to the peering IP of all<br>> other iBGP routers so I would assume an IGP must be run anyway???<br>> - cisco say that anything more than 50 routers on an area is a bad<br>> idea, so if I have over 200 sites potentially on the VPLS, will OSPF cut it?<br>> I guess i'm just trying to get my head around the different technology.<br>> I'd love to keep the stability that BGP brings, but
also would like to<br>> be able to make use of the bandwidth that VPLS gives.<br>> Any hints or tips will be gratefully received and thank you for<br>> any help. If you would like to keep from cluttering up<br>> subscriber's inboxes, please reply offlist.<br>> Again, thanks for any help.<br>> Regards,<br>> Brad David<br>> <br>> <br>> _______________________________________________<br>> AusNOG mailing list<br>> <a ymailto="mailto:AusNOG@lists.ausnog.net" href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><br>> <a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><br>> <br><br>-- Brad Gould, Network Engineer<br>Internode<br>PO Box 284, Rundle Mall 5000<br>Level 5, 150 Grenfell Street, Adelaide 5000<br>P: 08 8228 2999 F: 08 8235 6999<br><a ymailto="mailto:bradley@internode.com.au"
href="mailto:bradley@internode.com.au">bradley@internode.com.au</a>; <a href="http://www.internode.on.net/" target="_blank">http://www.internode.on.net/</a><br><br><br></div> </div> </div> </div></body></html>