Weighted Multi-Path Procedures for EVPN All-Active Multi-Homing
draft-malhotra-bess-evpn-unequal-lb-00
INTERNET-DRAFT N. Malhotra, Ed.
S. Thoria
A. Sajassi
Intended Status: Proposed Standard (Cisco)
A. Lingala
(AT&T)
Expires: May 3, 2018 October 30, 2017
Weighted Multi-Path Procedures for EVPN All-Active Multi-Homing
draft-malhotra-bess-evpn-unequal-lb-00
Abstract
In an EVPN-IRB based network overlay, EVPN LAG enables all-active
multi-homing for a host or CE device connected to two or more PEs via
a LAG bundle, such that bridged and routed traffic from remote PEs
can be equally load balanced (ECMPed) across the multi-homing PEs.
This document defines extensions to EVPN procedures to optimally
handle unequal access bandwidth distribution across a set of multi-
homing PEs in order to:
o provide greater flexibility, with respect to adding or
removing individual PE-CE links within the access LAG
o handle PE-CE LAG member link failures that can result in unequal
PE-CE access bandwidth across a set of multi-homing PEs
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INTERNET DRAFT EVPN Unequal Multi-Pathing May 3, 2017
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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 PE CE Link Provisioning . . . . . . . . . . . . . . . . . . 4
1.2 PE CE Link Failures . . . . . . . . . . . . . . . . . . . . 5
1.3 Design Requirement . . . . . . . . . . . . . . . . . . . . . 6
1.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . . 6
3. Weighted Unicast Traffic Load-balancing . . . . . . . . . . . 7
3.1 LOCAL PE Behavior . . . . . . . . . . . . . . . . . . . . . 7
3.2 REMOTE PE Behavior . . . . . . . . . . . . . . . . . . . . . 7
4. Weighted BUM Traffic Load-Sharing . . . . . . . . . . . . . . 8
5. Routed EVPN Overlay . . . . . . . . . . . . . . . . . . . . . . 8
6. EVPN-IRB Multi-homing with non-EVPN routing . . . . . . . . . . 9
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1 Normative References . . . . . . . . . . . . . . . . . . . 10
7.2 Informative References . . . . . . . . . . . . . . . . . . 10
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
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INTERNET DRAFT EVPN Unequal Multi-Pathing May 3, 2017
1 Introduction
In an EVPN-IRB based network overlay, with access an access CE multi-
homed via a LAG interface, bridged and routed traffic from remote PEs
can be equally load balanced (ECMPed) across the multi-homing PEs:
o ECMP Load-balancing for bridged unicast traffic is enabled via
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