MVPN/EVPN Tunnel Aggregation with Common Labels
draft-ietf-bess-mvpn-evpn-aggregation-label-05
BESS Z. Zhang
Internet-Draft Juniper Networks
Updates: 7432, 6514, 7582 (if approved) E. Rosen
Intended status: Standards Track Individual
Expires: July 15, 2021 W. Lin
Juniper Networks
Z. Li
Huawei Technologies
I. Wijnands
Individual
January 11, 2021
MVPN/EVPN Tunnel Aggregation with Common Labels
draft-ietf-bess-mvpn-evpn-aggregation-label-05
Abstract
The MVPN specifications allow a single Point-to-Multipoint (P2MP)
tunnel to carry traffic of multiple VPNs. The EVPN specifications
allow a single P2MP tunnel to carry traffic of multiple Broadcast
Domains (BDs). These features require the ingress router of the P2MP
tunnel to allocate an upstream-assigned MPLS label for each VPN or
for each BD. A packet sent on a P2MP tunnel then carries the label
that is mapped to its VPN or BD. (In some cases, a distinct
upstream-assigned is needed for each flow.) Since each ingress
router allocates labels independently, with no coordination among the
ingress routers, the egress routers may need to keep track of a large
number of labels. The number of labels may need to be as large (or
larger) than the product of the number of ingress routers times the
number of VPNs or BDs. However, the number of labels can be greatly
reduced if the association between a label and a VPN or BD is made by
provisioning, so that all ingress routers assign the same label to a
particular VPN or BD. New procedures are needed in order to take
advantage of such provisioned labels. These new procedures also
apply to Multipoint-to-Multipoint (MP2MP) tunnels. This document
updates RFCs 6514, 7432 and 7582 by specifying the necessary
procedures.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Zhang, et al. Expires July 15, 2021 [Page 1]
Internet-Draft mvpn-evpn-aggregation-label January 2021
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
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This Internet-Draft will expire on July 15, 2021.
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Table of Contents
1. Terminologies . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Problem Description . . . . . . . . . . . . . . . . . . . 4
2.2. Proposed Solution . . . . . . . . . . . . . . . . . . . . 5
2.2.1. MP2MP Tunnels . . . . . . . . . . . . . . . . . . . . 6
2.2.2. Segmented Tunnels . . . . . . . . . . . . . . . . . . 7
2.2.3. Summary of Label Allocation Methods . . . . . . . . . 9
3. Specification . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1. Context Label Space ID Extended Community . . . . . . . . 9
3.2. Procedures . . . . . . . . . . . . . . . . . . . . . . . 10
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