Fast Recovery for EVPN DF Election
draft-ietf-bess-evpn-fast-df-recovery-01
BESS Working Group A. Sajassi, Ed.
Internet-Draft G. Badoni
Intended status: Standards Track D. Rao
Expires: September 10, 2020 P. Brissette
Cisco
J. Drake
Juniper
J. Rabadan
Nokia
March 9, 2020
Fast Recovery for EVPN DF Election
draft-ietf-bess-evpn-fast-df-recovery-01
Abstract
Ethernet Virtual Private Network (EVPN) solution [RFC7432] describes
DF election procedures for multi-homing Ethernet Segments. These
procedures are enhanced further in [RFC8584] by applying Highest
Random Weight Algorithm for DF election in order to avoid DF status
unnecessarily upon a failure. This draft makes further improvement
to DF election procedures in [RFC8584] by providing two options for
fast DF election upon recovery of the failed link or node associated
with the multi-homing Ethernet Segment. This fast DF election is
achieved independent of number of EVIs associated with that Ethernet
Segment and it is performed via a simple signaling between the
recovered PE and each PE in the multi-homing group.
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 September 10, 2020.
Sajassi, et al. Expires September 10, 2020 [Page 1]
Internet-Draft Fast Recovery for EVPN DF Election March 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Challenges with Existing Solution . . . . . . . . . . . . . . 3
2.1. Overview of Proposed Solutions . . . . . . . . . . . . . 5
3. DF Election Handshake Solution . . . . . . . . . . . . . . . 5
3.1. Discovery . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. DF Candidates Determination . . . . . . . . . . . . . . . 6
3.3. DF Election Handshake . . . . . . . . . . . . . . . . . . 6
3.4. Node Insertion . . . . . . . . . . . . . . . . . . . . . 7
3.5. BGP Encoding . . . . . . . . . . . . . . . . . . . . . . 8
3.5.1. DF Election Handshake Request Route . . . . . . . . . 8
3.5.2. DF Election Handshake Response Route . . . . . . . . 8
3.6. DF Handshake Scenarios . . . . . . . . . . . . . . . . . 10
3.7. Backwards Compatibility . . . . . . . . . . . . . . . . . 12
4. DF Election Synchronization Solution . . . . . . . . . . . . 13
4.1. Advantages . . . . . . . . . . . . . . . . . . . . . . . 14
4.2. BGP Encoding . . . . . . . . . . . . . . . . . . . . . . 14
4.3. Note on NTP-based synchronization . . . . . . . . . . . . 15
4.4. Synchronization Scenarios . . . . . . . . . . . . . . . . 15
4.5. Backwards Compatibility . . . . . . . . . . . . . . . . . 16
5. Interoperability . . . . . . . . . . . . . . . . . . . . . . 17
6. Security Considerations . . . . . . . . . . . . . . . . . . . 17
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. Normative References . . . . . . . . . . . . . . . . . . 18
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