nanog mailing list archives
Re: IPv6 migration steps for mid-scale isp
From: Måns Nilsson <mansaxel () besserwisser org>
Date: Wed, 20 Sep 2017 18:14:25 +0200
Subject: Re: IPv6 migration steps for mid-scale isp Date: Wed, Sep 20, 2017 at 12:04:45PM -0300 Quoting Owen DeLong (owen () delong com):
iBGP is scalable, you can introduce router reflectors to avoid full mesh peering between PE routers – and the sky if your limit!I think in general most serious networks consider this a question of OSPF vs. ISIS for IGP and BGP is the only choice for EGP. I find it interesting that you don’t even mention ISIS in your discussion. I don’t know of any substantial networks running EIGRP these days. I’m not saying they don’t exist, but they are certainly rare exceptions.
The fact that we'll be running dual-stack for perhaps another decade and that there are no 36-hour days available makes the choice very simple; IS-IS is my preferred choice. One routing instance less. But, I'd rather limit the IS-IS scope to "links and loopbacks" -- there is no need to have link-state flooding for a customer network that will always be originated from one specific access router. iBGP is much more appropriate for that. As long as I'll have one working path up to that router I can rely on BGP to tell me where the network is. The key is the time domain. If the topology is likely to be changing slowly (customer moves premises or commissions new connection), use BGP to signal it. If the topology is potentially unstable, i.e. subject to backhoes and similar, use IS-IS. Oh, by the way; I concur with Owen: EIGRP is not done. I've stumbled on it once the last decade, and it was a PABX network engineer who insisted. -- Måns Nilsson primary/secondary/besserwisser/machina MN-1334-RIPE SA0XLR +46 705 989668 Am I in GRADUATE SCHOOL yet?
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Current thread:
- Re: IPv6 migration steps for mid-scale isp, (continued)
- Re: IPv6 migration steps for mid-scale isp Mikael Abrahamsson (Sep 14)
- Re: IPv6 migration steps for mid-scale isp Fredrik Sallinen (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Youssef Bengelloun-Zahr (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Michael Hallgren (Sep 16)
- Re: IPv6 migration steps for mid-scale isp sthaug (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Owen DeLong (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Baldur Norddahl (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Fredrik Sallinen (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Randy Bush (Sep 16)
- Re: IPv6 migration steps for mid-scale isp Ahad Aboss (Sep 20)
- Re: IPv6 migration steps for mid-scale isp Owen DeLong (Sep 20)
- Re: IPv6 migration steps for mid-scale isp Måns Nilsson (Sep 20)
- Re: IPv6 migration steps for mid-scale isp Mikael Abrahamsson (Sep 14)
- Re: IPv6 migration steps for mid-scale isp JORDI PALET MARTINEZ (Sep 18)
- Re: IPv6 migration steps for mid-scale isp Fredrik Sallinen (Sep 23)
- Re: IPv6 migration steps for mid-scale isp Mikael Abrahamsson (Sep 23)
- Re: IPv6 migration steps for mid-scale isp JORDI PALET MARTINEZ (Sep 25)
- Re: IPv6 migration steps for mid-scale isp Lee Howard (Sep 26)
- Re: IPv6 migration steps for mid-scale isp Fredrik Sallinen (Sep 23)