nanog mailing list archives
Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?)
From: Mark Tinka <mark.tinka () seacom mu>
Date: Sun, 21 Jun 2020 10:21:35 +0200
On 20/Jun/20 15:39, Masataka Ohta wrote:
Ipsilon was hopeless because, as Yakov correctly pointed out, flow driven approach to automatically detect flows does not scale. The problem of MPLS, however, is that, it must also be flow driven, because detailed route information at the destination is necessary to prepare nested labels at the source, which costs a lot and should be attempted only for detected flows.
Again, I think you are talking about what RSVP should have been. RSVP != MPLS.
Routing table at IPv4 backbone today needs at most 16M entries to be looked up by simple SRAM, which is as fast as MPLS look up, which is one of a reason why we should obsolete IPv6.
I'm not sure I should ask this in fear of taking this discussion way off tangent... aaah, what the heck: So if we can't assign hosts IPv4 anymore because it has run out, should we obsolete IPv6 in favour of CGN? I know this works.
Though resource reserved flows need their own routing table entries, they should be charged proportional to duration of the reservation, which can scale to afford the cost to have the entries.
RSVP failed to take off when it was designed. Outside of capturing Netflow data (or tracking firewall state), nobody really cares about handling flows at scale (no, I'm not talking about ECMP). Why would we want to do that in 2020 if we didn't in 2000? Mark.
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?) Randy Bush (Jun 22)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Fletcher Kittredge (Jun 23)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Masataka Ohta (Jun 23)
- RE: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) adamv0025 (Jun 22)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Robert Raszuk (Jun 21)
- RE: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) adamv0025 (Jun 22)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Masataka Ohta (Jun 22)
- RE: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) adamv0025 (Jun 22)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Mark Tinka (Jun 22)
- Re: why am i in this handbasket? (was Devil's Advocate - Segment Routing, Why?) Masataka Ohta (Jun 23)
- 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?) 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)