RFC 2890 (rfc2890) - Page 1 of 7
Key and Sequence Number Extensions to GRE
Alternative Format: Original Text Document
Network Working Group G. Dommety
Request for Comments: 2890 Cisco Systems
Category: Standards Track September 2000
Key and Sequence Number Extensions to GRE
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
GRE (Generic Routing Encapsulation) specifies a protocol for
encapsulation of an arbitrary protocol over another arbitrary network
layer protocol. This document describes extensions by which two
fields, Key and Sequence Number, can be optionally carried in the GRE
Header [1].
1. Introduction
The current specification of Generic Routing Encapsulation [1]
specifies a protocol for encapsulation of an arbitrary protocol over
another arbitrary network layer protocol. This document describes
enhancements by which two fields, Key and Sequence Number, can be
optionally carried in the GRE Header [1]. The Key field is intended
to be used for identifying an individual traffic flow within a
tunnel. The Sequence Number field is used to maintain sequence of
packets within the GRE Tunnel.
1.1. Specification Language
The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [3].
In addition, the following words are used to signify the requirements
of the specification.
Dommety Standards Track