Generic Delivery Functions
draft-zzhang-intarea-generic-delivery-functions-00
intarea Z. Zhang
Internet-Draft R. Bonica
Intended status: Standards Track K. Kompella
Expires: July 16, 2021 Juniper Networks
January 12, 2021
Generic Delivery Functions
draft-zzhang-intarea-generic-delivery-functions-00
Abstract
Some functionalities (e.g. fragmentation/reassembly and Encapsulating
Security Payload) provided by IPv6 can be viewed as delivery
functions independent of IPv6 or even IP entirely. This document
proposes to provide those functionalities at different layers (e.g.,
MPLS, BIER or even Ethernet) independent of IP.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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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 July 16, 2021.
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Internet-Draft Generic Delivery Functions January 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Specifications . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Generic Delivery Function Header . . . . . . . . . . . . 4
2.2. Generic Fragmentation Header . . . . . . . . . . . . . . 5
2.3. Payload Type Header . . . . . . . . . . . . . . . . . . . 6
2.4. Generic ESP/Authentication Header . . . . . . . . . . . . 6
2.5. MPLS Signaling . . . . . . . . . . . . . . . . . . . . . 6
2.5.1. BGP Signaling . . . . . . . . . . . . . . . . . . . . 6
2.5.2. IGP Signaling . . . . . . . . . . . . . . . . . . . . 7
3. Security Considerations . . . . . . . . . . . . . . . . . . . 8
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1. Normative References . . . . . . . . . . . . . . . . . . 9
6.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Consider an operator providing Ethernet services such as pseudowires,
VPLS or EVPN. The Ethernet frames that a Provider Edge (PE) device
receives from a Customer Edge (CE) device may have a larger size than
the PE-PE path MTU (pMTU) in the provider network. This could be
because
1. the provider network is built upon virtual connections (e.g.
pseudowires) provided by another infrastructure provider, or
2. the customer network uses jumbo frames while the provider network
does not, or
3. the provider-side overhead for transporting customers packets
across the network pushes past the pMTU.
In any case, the provider cannot simply require its customers to
change their MTU.
To get those large frames across the provider network, currently the
only workaround is to encapsulate the frames in IP (with or without
GRE) and then fragment the IP packets. Even if MPLS is used for
service delimiting, IP is used for transporation (MPLS over IP/GRE).
This may not be desirable in certain deployment scenarios, where MPLS
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is the preferred transport or IP encapsulation overhead is deemed
excessive.
IPv6 fragmentation and reassembly are based on the IPv6 Fragmentation
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