I would think 8 bits are sufficient. Others (like SegRtg mentioned below also 
use 8). 8 bits gives us tons of room to grow - especially since we have only a 
single value defined currently (SFP 0). If we have clear use cases that show us 
running out of 8 bits or getting close to that we can/should discuss and 
evaluate extensions in light of that but increasing the space "just in case" is 
not a prudent way to go.


-----Original Message-----
From: BIER <> on behalf of Xiejingrong 
Date: Wednesday, February 14, 2018 at 5:06 PM
To: Arkadiy Gulko <>, "" 
<>, "" <>
Subject: Re: [Bier] WGLC : draft-ietf-bier-isis-extensions-07.txt

    Hi Arkadiy,
    I checked the latest <draft-ietf-ospf-segment-routing-extensions-24> and 
<draft-ietf-isis-segment-routing-extensions-15> for reference and comparing, 
and they both use a 8 bits Algorithm.
    One of the description: "Algorithm: Single octet identifying the algorithm."
    Interesting to use more than 8 bits for BIER's future flexibility :-)
    -----Original Message-----
    From: BIER [] On Behalf Of
    Sent: Wednesday, February 14, 2018 8:42 AM
    Subject: [Bier] WGLC : draft-ietf-bier-isis-extensions-07.txt
    Hello Working Group,
    After initial discussions between multiple participants of the working 
group, we consolidated that BIER's future flexibility would be well served if 
we extend the IGP signaling BAR field to 16 bits. We are currently reviewing 
various use-cases that can greatly benefit from this enhancement.
    I would appreciate if the proposed change could be considered as part of 
IETF Last Call review.
    -----Original Message-----
    From: BIER [] On Behalf Of
    Sent: Friday, February 09, 2018 5:11 PM
    Subject: [Bier] I-D Action: draft-ietf-bier-isis-extensions-07.txt
    A New Internet-Draft is available from the on-line Internet-Drafts 
    This draft is a work item of the Bit Indexed Explicit Replication WG of the 
            Title           : BIER support via ISIS
            Authors         : Les Ginsberg
                              Tony Przygienda
                              Sam Aldrin
                              Jeffrey (Zhaohui) Zhang
        Filename        : draft-ietf-bier-isis-extensions-07.txt
        Pages           : 10
        Date            : 2018-02-09
       Specification of an ISIS extension to support BIER domains and sub-
    The IETF datatracker status page for this draft is:
    There are also htmlized versions available at:
    A diff from the previous version is available at:
    Please note that it may take a couple of minutes from the time of 
submission until the htmlized version and diff are available at
    Internet-Drafts are also available by anonymous FTP at:
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