BIER Underlay Path Calculation Algorithm and Constraints

The information below is for an old version of the document
Document Type Expired Internet-Draft (bier WG)
Authors Zhaohui Zhang  , Tony Przygienda  , Andrew Dolganow  , Hooman Bidgoli  , IJsbrand Wijnands  , Arkadiy Gulko 
Last updated 2020-07-17 (latest revision 2019-11-04)
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state WG Consensus: Waiting for Write-Up
Doc Shepherd Follow-up Underway
Document shepherd Greg Mirsky
IESG IESG state Expired
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Send notices to Greg Mirsky <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies general rules for interaction between the BAR (BIER Algorithm) and IPA (IGP Algorithm) fields defined in ISIS/ OSPFv2 Extensions for BIER. The semantics for the BAR and IPA fields (when both or any of them is non-zero) defined in this document updates the semantics defined in RFC8444/RFC8401.


Zhaohui Zhang (
Tony Przygienda (
Andrew Dolganow (
Hooman Bidgoli (
IJsbrand Wijnands (
Arkadiy Gulko (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)