Internet-Draft draft-ietf-bess-evpn-unequal-lb-30.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-30.txt
Pages: 25
Dates: 2026-01-02
Abstract:
Ethernet VPN (EVPN) provides all-active multi-homing for Customer
Equipment (CE) devices connected to multiple Provider Edge (PE)
devices, enabling equal cost load balancing of both bridged and
routed traffic across the set of multi-homing PEs. However, existing
procedures implicitly assume equal access bandwidth distribution
among the multi-homing PEs, which can constrain link additions or
removals and may not handle unequal PE-CE link bandwidth following
link failures. This document specifies extensions to EVPN procedures
to support weighted multi-pathing in proportion to PE-CE link
bandwidth or operator-defined weights, thereby providing greater
flexibility and resilience in multi-homing deployments. The
extensions include signaling mechanisms to distribute traffic across
egress PEs based on relative bandwidth or weight, and enhancements to
Broadcast, Unknown Unicast, and Multicast (BUM) designated forwarder
(DF) election to achieve weighted DF distribution across the multi-
homing PE set. The document updates RFC 8584 and related EVPN DF
election extensions (i.e. draft-ietf-bess-evpn-per-mcast-flow-df-
election and draft-ietf-bess-evpn-pref-df) to enable weighted load
balancing across different DF election algorithms.
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-30
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-bess-evpn-unequal-lb-30
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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