Re: [Bier] Warren Kumari's No Objection on draft-ietf-bier-architecture-07: (with COMMENT)

Eric C Rosen <erosen@juniper.net> Wed, 05 July 2017 20:08 UTC

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To: Warren Kumari <warren@kumari.net>, The IESG <iesg@ietf.org>
Cc: draft-ietf-bier-architecture@ietf.org, Greg Shepherd <gjshep@gmail.com>, bier-chairs@ietf.org, bier@ietf.org
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From: Eric C Rosen <erosen@juniper.net>
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Date: Wed, 05 Jul 2017 16:08:08 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/Tml1vU5itlQlskd5T22IBuvVoCM>
Subject: Re: [Bier] Warren Kumari's No Objection on draft-ietf-bier-architecture-07: (with COMMENT)
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On 7/5/2017 3:22 PM, Warren Kumari wrote:
> Notes:
> Section 1:
> "If the packet also needs to be sent to a BFER whose BFR-id is 257, the BFIR
> would have to create a second copy of the packet, and the BIER encapsulation
> would specify an SI of 1, and a BitString with bit 1 set and all the other bits
> clear." - while reading this it seemed to me that it would be much simpler to
> do away with the SI completely and just make the BitString N bits longer

The size of the BitString is really determined by the capabilities of 
the forwarding hardware.  And the encapsulations (at least, those 
specified in draft-ietf-bier-mpls-encapsulation) support only certain 
sizes.  If your hardware supports only a BitStringLength of 256, and you 
have 257 BFERs, you can't just say, "hey let's use a longer BitString".  
Even if your hardware supports the next larger BitStringLength, 512, you 
might not want to use a BitStringLength of 512 when you only have 257 BFERs.

> (instead of having e.g a one octet SI and 2 octet BitString, concatenate this
> and have a 3 octet BitString).

A 3-octet BitString would allow you to identify 24 BFERs (3*8), whereas 
a 1-octet SI and a 2-octet BitString allow you to identify 4096 BFERs 
(256*16).  BTW, the BitStringLengths that are envisioned are all larger 
than two octets.  I wouldn't expect to see less than 64 bits, and 256 is 
more likely.

> It was only when I got down to Section 3 that I
> discovered that this is (kinda) discussed, and that each SI can have a
> different BitString length.

Sub-domains can have different BitStringLengths, the SI is relative to a 
single sub-domain.  The fact that sub-domains can have different 
BitStringLengths may be useful if you have hardware that supports 
multiple BitStringLengths, but that's really orthogonal to whether the 
SI is needed.

> "Alternatively, one could deploy a routing underlay that creates a
> multicast-specific tree of some sort, perhaps a Steiner tree." A reference for
> Steiner trees would be nice -- best I could find was probably the WA page at:
> Weisstein, Eric W. "Steiner Tree." From MathWorld--A Wolfram Web Resource.
> http://mathworld.wolfram.com/SteinerTree.html  

I think it is probably best to remove the mention of Steiner trees and 
instead just say that the routing underlay could be some sort of 
multicast tree.