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List: mpls
Subject: Re: [mpls] Alexey Melnikov's Discuss on draft-ietf-mpls-rfc3107bis-02: (with DISCUSS and COMMENT)
From: Alexey Melnikov <aamelnikov () fastmail ! fm>
Date: 2017-08-17 13:55:39
Message-ID: 1502978139.44713.1076448424.7F87482D () webmail ! messagingengine ! com
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Hi Eric,
On Thu, Aug 17, 2017, at 02:51 PM, Eric C Rosen wrote:
> H Alexey,
>
> In BGP, anything that is announced by a Capability is always optional.
> Per the draft, if one doesn't send the Multiple Labels Capability, one
> sends exactly one label in the NLRI. So in that sense, the mandatory
> minimum value is 1. I thought this part was clear from the first bullet
> point in Section 2.
Yes, this part was clear.
> When the Multiple Labels Capability is sent at session establishment
> time, I thought the new text:
>
> "A triple of the form <AFI=x,SAFI=y,Count=0> or <AFI=x,SAFI=y,Count=1>
> MUST NOT be sent. If such a triple is received, it MUST be ignored."
>
> implied that the mandatory minimum value is 2, as that text precludes
> the use of the only smaller values.
I got that. I thought 2 was a rather low limit, but you made a good
explanation in this email, so I am Ok with that. So I will clear my
DISCUSS.
> If you think this isn't clear enough, I can some text like "Any
> implementation that sends a Multiple Labels Capability MUST be able to
> support at least two labels in the NLRI. However, there may be
> deployment scenarios in which a larger number of labels is needed."
>
> Would that be okay?
Probably not needed, but I am Ok if the above is added.
> I wouldn't want to make the mandatory minimum any larger, because (a)
> some deployment scenarios might only require two labels, and (b) we
> don't want to have a larger mandatory minimum because the number of
> labels is not merely a control plane issue, but also affects the data
> plane. E.g., if some platform can only push two labels at a time,
> there's no value to requiring it to support three labels in the control
> plane.
>
> Eric
>
>
>
>
>
>
>
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