nanog mailing list archives
Re: Devil's Advocate - Segment Routing, Why?
From: Baldur Norddahl <baldur.norddahl () gmail com>
Date: Sun, 21 Jun 2020 12:45:28 +0200
On Sun, Jun 21, 2020 at 9:56 AM Mark Tinka <mark.tinka () seacom mu> wrote:
On 20/Jun/20 22:00, Baldur Norddahl wrote: I can't speak for the year 2000 as I was not doing networking at this level at that time. But when I check the specs for the base mx204 it says something like 32 VRFs, 2 million routes in FIB and 6 million routes in RIB. Clearly those numbers are the total of routes across all VRFs otherwise you arrive at silly numbers (64 million FIB if you multiply, 128k FIB if you divide by 32). My conclusion is that scale wise you are ok as long you do not try to have more than one VRF with a complete copy of the DFZ. I recall a number of networks holding multiple VRF's, including at least 2x Internet VRF's, for numerous use-cases. I don't know if they still do that today, but one can get creative real quick :-).
Yes I once made a plan to have one VRF per transit provider plus a peering VRF. That way our BGP customers could have a session with each of those VRFs to allow them full control of the route mix. I would of course also need a Internet VRF for our own needs. But the reality of that would be too many copies of the DFZ in the routing tables. Although not necessary in the FIB as each of the transit VRFs could just have a default route installed. Regards, Baldur
Current thread:
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?), (continued)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Robert Raszuk (Jun 20)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Mark Tinka (Jun 21)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Masataka Ohta (Jun 19)
- Re: Devil's Advocate - Segment Routing, Why? Robert Raszuk (Jun 19)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Baldur Norddahl (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Baldur Norddahl (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Baldur Norddahl (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Baldur Norddahl (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- RE: Devil's Advocate - Segment Routing, Why? adamv0025 (Jun 22)
- Re: Devil's Advocate - Segment Routing, Why? Masataka Ohta (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Masataka Ohta (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Robert Raszuk (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)