nanog mailing list archives
Re: Devil's Advocate - Segment Routing, Why?
From: Mark Tinka <mark.tinka () seacom mu>
Date: Sun, 21 Jun 2020 09:52:38 +0200
On 21/Jun/20 00:54, Sabri Berisha wrote:
That will be very advantageous in a datacenter environment, or any other environment dealing with a lot of ECMP paths. I can't tell you how often during my eBay time I've been troubleshooting end-to-end packetloss between hosts in two datacenters where there were at least 10 or more layers of up to 16 way ECMP between them. Having a record of which path is being taken by a packet is very helpful to determine the one with a crappy transceiver. That work is already underway, albeit not specifically for MPLS. For example, I've worked with an experimental version of In-Band Network Telemetry (INT) as described in this draft: https://tools.ietf.org/html/draft-kumar-ippm-ifa-02 I even demonstrated a very basic implementatoin during SuperCompute 19 in Denver last year. Most people who were interested in the demo were academics however, probably because it wasn't a real networking event. Note that there are several caveats that come with this draft and previous versions, and that it is still very much work in progress. But the potential is huge, at least in the DC.
Alright, we'll wait and see, then.
That's a different story, but not entirely impossible. A probe packet can be sent across AS borders, and as long as the two NOCs are cooperating, the entire path can be reconstructed.
Yes, for once-off troubleshooting, I suppose that would work. My concern is if it's for normal day-to-day operations. But who knows, maybe someone will propose that too :-). Mark.
Current thread:
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why?, (continued)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 19)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Tim Durack (Jun 19)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? steve ulrich (Jun 19)
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 19)
- Message not available
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Message not available
- Re: [c-nsp] Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Anoop Ghanwani (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? Sabri Berisha (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 21)
- Re: Devil's Advocate - Segment Routing, Why? Owen DeLong (Jun 20)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? Saku Ytti (Jun 17)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Saku Ytti (Jun 18)
- Re: Devil's Advocate - Segment Routing, Why? Mark Tinka (Jun 18)