EVPN multi-homing port-active load-balancing
draft-ietf-bess-evpn-mh-pa-00
BESS Working Group P. Brissette, Ed.
Internet-Draft A. Sajassi
Intended status: Standards Track Cisco Systems
Expires: August 20, 2020 B. Wen
Comcast
E. Leyton
Verizon Wireless
J. Rabadan
Nokia
L. Burdet
S. Thoria
Cisco Systems
February 17, 2020
EVPN multi-homing port-active load-balancing
draft-ietf-bess-evpn-mh-pa-00
Abstract
The Multi-Chassis Link Aggregation Group (MC-LAG) technology enables
the establishment of a logical link-aggregation connection with a
redundant group of independent nodes. The purpose of multi-chassis
LAG is to provide a solution to achieve higher network availability,
while providing different modes of sharing/balancing of traffic.
EVPN standard defines EVPN based MC-LAG with single-active and all-
active multi-homing load-balancing mode. The current draft expands
on existing redundancy mechanisms supported by EVPN and introduces
support of port-active load-balancing mode. In the current document,
port-active load-balancing mode is also referred to as per interface
active/standby.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 20, 2020.
Brissette, et al. Expires August 20, 2020 [Page 1]
Internet-Draft EVPN MH Port-Active February 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Multi-Chassis Ethernet Bundles . . . . . . . . . . . . . . . 4
3. Port-active load-balancing procedure . . . . . . . . . . . . 4
4. Algorithm to elect per port-active PE . . . . . . . . . . . . 5
4.1. Capability Flag . . . . . . . . . . . . . . . . . . . . . 5
4.2. Modulo-based Designated Forwarder Algorithm . . . . . . . 6
4.3. HRW Algorithm . . . . . . . . . . . . . . . . . . . . . . 6
4.4. Preferred-DF Algorithm . . . . . . . . . . . . . . . . . 6
5. Convergence considerations . . . . . . . . . . . . . . . . . 6
5.1. Primary / Backup per Ethernet-Segment . . . . . . . . . . 7
5.2. Backward Compatibility . . . . . . . . . . . . . . . . . 7
6. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Overall Advantages . . . . . . . . . . . . . . . . . . . . . 8
8. Security Considerations . . . . . . . . . . . . . . . . . . . 8
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
10.1. Normative References . . . . . . . . . . . . . . . . . . 9
10.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
EVPN, as per [RFC7432], provides all-active per flow load balancing
for multi-homing. It also defines single-active with service carving
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