< draft-ietf-isis-admin-tags-01.txt		draft-ietf-isis-admin-tags-02.txt >
	Network Working Group Christian Martin		Network Working Group Christian Martin
	INTERNET DRAFT Verizon Internet Services		INTERNET DRAFT Verizon
	Expiration Date: January 2003 Brad Neal		Expiration Date: January 2005 Brad Neal
	Broadwing Communications		Broadwing Communications
	Stefano Previdi		Stefano Previdi
	August 2002 Cisco Systems		July 2004 Cisco Systems
	A Policy Control Mechanism in IS-IS Using Administrative Tags		A Policy Control Mechanism in IS-IS Using Administrative Tags
	<draft-ietf-isis-admin-tags-01.txt>		<draft-ietf-isis-admin-tags-02.txt>
	1. Status of this Memo		1. Status of this Memo
	This document is an Internet-Draft and is in full conformance with		This document is an Internet-Draft and is in full conformance with
	all provisions of Section 10 of RFC 2026.		all provisions of Section 10 of RFC 2026.
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF), its areas, and its working groups. Note that		Task Force (IETF), its areas, and its working groups. Note that
	other groups may also distribute working documents as Internet-		other groups may also distribute working documents as Internet-
	Drafts.		Drafts.
	skipping to change at page 1, line 38 ¶		skipping to change at page 1, line 37 ¶
	The list of current Internet-Drafts can be accessed at		The list of current Internet-Drafts can be accessed at
	http://www.ietf.org/ietf/1id-abstracts.txt		http://www.ietf.org/ietf/1id-abstracts.txt
	The list of Internet-Draft Shadow Directories can be accessed at		The list of Internet-Draft Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.		http://www.ietf.org/shadow.html.
	2. Abstract		2. Abstract
	This document describes an extension to the IS-IS protocol to add		This document describes an extension to the IS-IS protocol to add
	operational capabilities that allow for ease of management and		operational capabilities that allow for ease of management and
	control over IP prefix distribution within an IS-IS domain. The IS-		control over IP prefix distribution within an IS-IS domain.
	IS protocol is specified in [1], with extensions for supporting IPv4
	specified in [2] and further enhancements for Traffic Engineering [4]
	in [3] and [6].
	This document enhances the IS-IS protocol by extending the		This document enhances the IS-IS protocol by extending the
	information that a Intermediate System (IS) [router] can place in		information that a Intermediate System (IS) [router] can place in
	Link State Protocol Data Units (LSPs) as specified in [2]. This		Link State Protocol Data Units (LSPs) for policy use. This
	extension will provide operators with a mechanism to control IP		extension will provide operators with a mechanism to control IP
	prefix distribution throughout multi-level IS-IS domains.		prefix distribution throughout multi-level IS-IS domains.
	Additionally, the information can be placed in LSPs that have TLVs as		Additionally, the information can be placed in LSPs that have TLVs as
	yet undefined, if this information is used to convey the same meaning		yet undefined, if this information is used to convey the same meaning
	in these future TLVs as it is used in the currently defined TLVs.		in these future TLVs as it is used in the currently defined TLVs.
	3. Specification of Requirements		3. Specification of Requirements
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
	skipping to change at page 5, line 7 ¶		skipping to change at page 5, line 7 ¶
	L1 / \		L1 / \
	R1----1.1.1.0/24 (A) R5		R1----1.1.1.0/24 (A) R5
	|		|
	|		|
	1.1.2.0/24 (B)		1.1.2.0/24 (B)
	Figure 1		Figure 1
	We associate Administrative Tag 100 with property A, and have R5		We associate Administrative Tag 100 with property A, and have R5
	attach that value to the IP extended reachability information TLV for		attach that value to the IP extended reachability information TLV for
	prefix 1.1.1.0/24. R2 has a policy in place to "match prefixes with		prefix 1.1.2.0/24. R2 has a policy in place to "match prefixes with
	Administrative Tag 100, and leak to L1."		Administrative Tag 100, and leak to L1."
	The previous example is rather simplistic; it seems that it would be		The previous example is rather simplistic; it seems that it would be
	just as easy for R2 simply to match the prefix 1.1.1.0/24. However,		just as easy for R2 simply to match the prefix 1.1.2.0/24. However,
	if there are a large number of routers that need to apply some policy		if there are a large number of routers that need to apply some policy
	according to property A and large number of "A" prefixes, this		according to property A and large number of "A" prefixes, this
	mechanism can be quite helpful.		mechanism can be quite helpful.
	9. Security Considerations		9. Security Considerations
	This document raises no new security issues for IS-IS, as any		This document raises no new security issues for IS-IS, as any
	annotations to IP prefixes should not pass outside the administrative		annotations to IP prefixes should not pass outside the administrative
	control of the network operator of the IS-IS domain. Such an		control of the network operator of the IS-IS domain. Such an
	allowance would violate the spirit of Interior Gateway Protocols in		allowance would violate the spirit of Interior Gateway Protocols in
	skipping to change at page 6, line 32 ¶		skipping to change at page 6, line 32 ¶
	[5] Li,T., Przygienda, T., Smit, H., "Domain-wide Prefix Distribution		[5] Li,T., Przygienda, T., Smit, H., "Domain-wide Prefix Distribution
	with Two-Level IS-IS" RFC 2966, October 2000		with Two-Level IS-IS" RFC 2966, October 2000
	[6] Przygienda, T., Shen, N., Sheth, N., "M-ISIS: Multi Topology		[6] Przygienda, T., Shen, N., Sheth, N., "M-ISIS: Multi Topology
	Routing in IS-IS", draft-ietf-isis-wg-multi-topology-03.txt, April		Routing in IS-IS", draft-ietf-isis-wg-multi-topology-03.txt, April
	2002.		2002.
	13. Authors' Address		13. Authors' Address
	Christian Martin		Christian Martin
	Verizon Internet Services		Verizon
	1880 Campus Commons Dr		1880 Campus Commons Dr
	Reston, VA 20191		Reston, VA 20191
	Email: cmartin@gnilink.net		Email: cmartin@verizon.com
	Brad Neal		Brad Neal
	Broadwing Communications		Broadwing Communications
	1835 Kramer Lane - Suite 100		1835 Kramer Lane - Suite 100
	Austin, TX 78758		Austin, TX 78758
	USA		USA
	Email: bneal@broadwing.com		Email: bneal@broadwing.com
	Stefano Previdi		Stefano Previdi
	Cisco Systems, Inc.		Cisco Systems, Inc.
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