Re: [mpls] Eric Rescorla's No Objection on draft-ietf-mpls-rfc3107bis-02: (with COMMENT)

Eric C Rosen <erosen@juniper.net> Thu, 03 August 2017 13:48 UTC

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To: Eric Rescorla <ekr@rtfm.com>, The IESG <iesg@ietf.org>
Cc: draft-ietf-mpls-rfc3107bis@ietf.org, Loa Andersson <loa@pi.nu>, mpls-chairs@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] Eric Rescorla's No Objection on draft-ietf-mpls-rfc3107bis-02: (with COMMENT)
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On 8/2/2017 2:16 PM, Eric Rescorla wrote:
> S 2.1
> I note that you use 255 to mean "any number of labels" and 0 is marked
> ignore. Is there a reason not to use 255 as a concrete number and 0
> to mean "any number"? This is just for my information.

There is no real reason.

The NLRI field itself can only be 255 bits long, so there's really only 
room for a handful of labels.  There's no possibility that someone will 
actually need to announce support for 255 labels.