Hi, all, Am 10.12.2013 um 13:43 schrieb Justin M. Streiner <[email protected]>:
> On 10/Dec/2013 at 09:22:01 AM, Patrick M. Hausen wrote: >> I do have the knowledge and capacity to implement iBGP as my IGP >> *now*, except for the route reflectors suggested. Would you recommend >> that approach? I.e. going without the route reflectors and the communities >> first? It~Rs only 4-5 machines in total, after all, all Cisco. And no >> customers with BGP currently. > > Starting out with route reflectors is a good idea. It makes the network > easier to scale as needed. > > Doing a full IBGP mesh gets messy very quickly. Even if you use peer-groups > to simplify things, you're still dealing with a lot of IBGP sessions ((n * (n > - 1)) / 2 sessions). With 5 routers, that would mean 10 sessions. With 10 > routers, that would mean 45 sessions. Additionally, managing all of those > sessions can chew up a lot of resources on your routers. Anything you can > simplify will serve you well over time. I see. I’m starting with 4 routers and I simply do not have the hardware at hand *now* to implement something that critical to my network. Of course a VM will do, but I do not have free virtual ressources with sufficient redundancy, either. Of the 4 routers only 2 connect to different ASes via BGP, the other two 2961s are only there to provide a cheaper platform for ATM and G.703 links. (I reuse my old 3600 series OC3-Modules and some VWICs with these) The job of the IGP is to anounce the customer's subnets of those lines to the two big boxes and give the small ones a hand via default-information originate. It really is that simple. For now - you do have a point here ;-) But I don’t see our subscriber line business expanding. And the plan is to have IS-IS, external BGP and v6 up and running before Christmas. So it’s either full mesh or IS-IS - I will come to a decision tomorrow after toying with the not-yet-productive systems some more. Sorry if I seem resistant to sound advice, but I have to stick to my priorities and put learning even more great things beside IS-IS up for a little later. I will definitely set up a route reflector before putting another $BIGBOX with full tables into service. Or add another location. Or anything that actually extends our small single rack backbone. That much I see now … Thanks again for all help. Patrick -- punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 [email protected] http://www.punkt.de Gf: Jürgen Egeling AG Mannheim 108285
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