Re: [mpls] [bier] The first nibble issue associated with MPLS encapsulation

Eric C Rosen <erosen@juniper.net> Thu, 14 April 2016 21:43 UTC

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To: Stewart Bryant <stewart.bryant@gmail.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
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From: Eric C Rosen <erosen@juniper.net>
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Date: Thu, 14 Apr 2016 17:43:00 -0400
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "bier@ietf.org" <bier@ietf.org>, "Dr. Tony Przygienda" <tonysietf@gmail.com>
Subject: Re: [mpls] [bier] The first nibble issue associated with MPLS encapsulation
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On 4/14/2016 3:31 PM, Stewart Bryant wrote:
> Well there will be Ethernet PWs not using the CW that can put any 
> Ethernet address in the first nibble, so
> if there are Ethernet addresses that start with 5 they will look like 
> BIER packets.

What problem will that cause?

> Sorry I meant version number.
>
> Before we assign a member of this very small number range to BIER,

The first nibble of the BIER header does not have to have a value taken 
from the IP version number registry.

> I would like some confidence that it will see any significant 
> deployment. When PW took 0 and 1, it was already a widely deployed 
> protocol. 

Note though that when PW started using 0 and 1 in the first nibble, it 
was not already a widely deployed protocol.  I'd say it was a mistake to 
reserve 0 and 1 in the IP version number registry, as those reservations 
have no practical impact, and just cause a lot of unproductive 
discussions to take place.