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Re: [spring] SRv6 SIDs and IPv6 addressing

"Darren Dukes (ddukes)" <ddukes@cisco.com> Tue, 17 March 2020 16:39 UTC

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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: Sander Steffann <sander@steffann.nl>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] SRv6 SIDs and IPv6 addressing
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Date: Tue, 17 Mar 2020 16:39:09 +0000
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Subject: Re: [spring] SRv6 SIDs and IPv6 addressing
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Hi Sander, such things as ‘pseudo interfaces’ are local behavior, they're implementation specific.

Darren

> On Mar 16, 2020, at 1:39 PM, Sander Steffann <sander@steffann.nl> wrote:
> 
> Hi,
> 
>> How this relates to NETPGM
>> - SRv6 SIDs are IPv6 addresses.
>> - SRv6 SIDs are not necessarily interface addresses.
> 
> This will need some work, because according to https://tools.ietf.org/html/rfc4291#section-2.1: "IPv6 addresses of all types are assigned to interfaces, not nodes.". I think at least defining a pseudo-interface (like a loopback) is required to comply with RFC 4291.
> 
> Speaking as an operator: this would also make SRv6 SIDs easier to understand conceptually. It would also make it easier to debug because the SID would be a "normal" IPv6 address on an interface, not something that isn't visible in the RIB/FIB but is still handled in the local router. Having a RIB/FIB entry and an interface (if only a pseudo one) would make existing debugging practices easier to apply.
> 
> If NETPGM deviates from RFC 4291 I think that needs to be strongly justified. Not deviating from existing standards should be the default :)
> 
> Cheers,
> Sander
>

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