Re: [bess] MPLS Label value 3 in <draft-dawra-bess-srv6-services-00>

Xiejingrong <xiejingrong@huawei.com> Thu, 27 June 2019 14:12 UTC

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From: Xiejingrong <xiejingrong@huawei.com>
To: "draft-dawra-bess-srv6-services@ietf.org" <draft-dawra-bess-srv6-services@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] MPLS Label value 3 in <draft-dawra-bess-srv6-services-00>
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Date: Thu, 27 Jun 2019 14:12:18 +0000
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Subject: Re: [bess] MPLS Label value 3 in <draft-dawra-bess-srv6-services-00>
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s/6556/8556/g

7432 section 8.2.1
The MPLS label in the NLRI MUST be set to 0.

8556 section 3
The MPLS label field SHOULD be set to zero.
From:Xiejingrong <xiejingrong@huawei.com>
To:draft-dawra-bess-srv6-services@ietf.org <draft-dawra-bess-srv6-services@ietf.org>;bess@ietf.org <bess@ietf.org>
Date:2019-06-27 19:57:30
Subject:[bess] MPLS Label value 3 in

Hi folks,

One question about MPLS Label value 3 used in <draft-dawra-bess-srv6-services-00>:

the Label value in any service route NLRI encoding MUST be set to Implicit NULL [RFC3032].

Label = Implicit NULL

I think the more common use of MPLS Label to represent “invalid” is to use zero, as in RFC7432 and RFC6556.

Why this document use value 3 (Implicit NULL as defined in RFC3032) ?

Thanks
Jingrong