Internet-Draft draft-ietf-bess-evpn-unequal-lb-19.txt is now available. It is
a work item of the BGP Enabled ServiceS (BESS) WG of the IETF.
Title: Weighted Multi-Path Procedures for EVPN Multi-Homing
Authors: Neeraj Malhotra
Ali Sajassi
Jorge Rabadan
John Drake
Avinash Lingala
Samir Thoria
Name: draft-ietf-bess-evpn-unequal-lb-19.txt
Pages: 23
Dates: 2023-12-04
Abstract:
EVPN enables all-active multi-homing for a CE (Customer Equipment)
device connected to two or more PE (Provider Equipment) devices via a
LAG (Link Aggregation), such that bridged and routed traffic from
remote PEs to hosts attached to the Ethernet Segment can be equally
load balanced (it uses Equal Cost Multi Path) across the multi-homing
PEs. EVPN also enables multi-homing for IP subnets advertised in IP
Prefix routes, so that routed traffic from remote PEs to those IP
subnets can be load balanced. This document defines extensions to
EVPN procedures to optimally handle unequal access bandwidth
distribution across a set of multi-homing PEs in order to:
* provide greater flexibility, with respect to adding or removing
individual multi-homed PE-CE links.
* handle multi-homed PE-CE link failures that can result in unequal
PE-CE access bandwidth across a set of multi-homing PEs.
In order to achieve the above, it specifies signaling extensions and
procedures to:
* Loadbalance bridged and routed traffic across egress PEs in
proportion to PE-CE link bandwidth or a generalized weight
distribution.
* Achieve BUM (Broadcast, UnknownUnicast, Multicast) DF (Designated
Forwarder) election distribution for a given ES (Ethernet Segment)
across the multi-homing PE set in proportion to PE-CE link
bandwidth. Section 6 of this document further updates [RFC8584],
[EVPN-PER-MCAST-FLOW-DF], and [EVPN-DF-PREF] in order for the DF
election extension defined in this document to work across
different DF election algorithms.
NOTE TO IESG (TO BE DELETED BEFORE PUBLISHING): This draft lists six
authors which is above the required limit of five. Given significant
and active contributions to the draft from all six authors over the
course of six years, we would like to request IESG to allow
publication with six authors. Specifically, the three Cisco authors
are the original inventors of these procedures and contributed
heavily to rev 0 draft, most of which is still intact. AT&T is also
a key contributor towards defining the use cases that this document
addresses as well as the proposed solution. Authors from Nokia and
Juniper have further contributed to revisions and discussions
steadily over last six years to enable respective implementations and
a wider adoption.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-unequal-lb/
There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-unequal-lb-19
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-bess-evpn-unequal-lb-19
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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