Devil's Advocate - Segment Routing, Why?

Owen DeLong owen at delong.com
Sun Jun 21 00:43:57 UTC 2020


> On Jun 20, 2020, at 2:27 PM, Mark Tinka <mark.tinka at seacom.mu> wrote:
> 
> 
> 
> On 20/Jun/20 00:41, Anoop Ghanwani wrote:
> 
>> One of the advantages cited for SRv6 over MPLS is that the packet contains a record of where it has been.
> 
> I can't see how advantageous that is, or how possible it would be to implement, especially for inter-domain traffic.
> 
> Mark.
> 

Since the packet is essentially source-routed, and the labels aren’t popped off the way they are in MPLS, but preserved in the hop by hop headers (AIUI), the implementation isn’t particularly difficult.

Owen



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