draft-ietf-idr-bgp-ext-communities-02.txt		draft-ietf-idr-bgp-ext-communities-03.txt
	Network Working Group Srihari R. Sangli		Network Working Group Srihari R. Sangli
	Internet Draft Procket Networks		Internet Draft Procket Networks
	Expiration Date: April 2002		Expiration Date: September 2002
	Daniel Tappan		Daniel Tappan
	Cisco Systems		Cisco Systems
	Yakov Rekhter		Yakov Rekhter
	Juniper Networks		Juniper Networks
	BGP Extended Communities Attribute		BGP Extended Communities Attribute
	draft-ietf-idr-bgp-ext-communities-02.txt		draft-ietf-idr-bgp-ext-communities-03.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 RFC2026.		all provisions of Section 10 of RFC2026.
	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 6, line 11		skipping to change at page 6, line 11
	This is a generic community of extended type. The value of the		This is a generic community of extended type. The value of the
	sub-type which should define the Value Field is to be assigned		sub-type which should define the Value Field is to be assigned
	by IANA.		by IANA.
	6. Route Target Community		6. Route Target Community
	The Route Target Community identifies one or more routers that may		The Route Target Community identifies one or more routers that may
	receive a set of routes (that carry this Community) carried by BGP.		receive a set of routes (that carry this Community) carried by BGP.
	This is transitive across the Autonomous system boundary.		This is transitive across the Autonomous system boundary.
	The value of the Type field for the Route Target Community is 0x00 or		The value of the Type field for the Route Target Community can be
	0x01. The value of the low-order octet of the extended type field		0x00, 0x01 or 0x02. The value of the low-order octet of the extended
	for this community is 0x02.		type field for this community is 0x02.
	When the value of the Type field is 0x00, the value of the Local		When the value of the Type field is 0x00 or 0x02, the value of the
	Administrator sub-field in the Value Field MUST be unique within the		Local Administrator sub-field in the Value Field MUST be unique
	Autonomous system carried in the Global Administrator sub-field.		within the Autonomous system carried in the Global Administrator sub-
			field.
	7. Route Origin Community		7. Route Origin Community
	The Route Origin Community identifies one or more routers that inject		The Route Origin Community identifies one or more routers that inject
	a set of routes (that carry this Community) into BGP. This is		a set of routes (that carry this Community) into BGP. This is
	transitive across the Autonomous system boundary.		transitive across the Autonomous system boundary.
	The value of the Type field for the Route Origin Community is 0x00 or		The value of the Type field for the Route Origin Community can be
	0x01. The value of the low-order octet of the extended type field		0x00, 0x01 or 0x02. The value of the low-order octet of the extended
	for this community is 0x03.		type field for this community is 0x03.
	When the value of the Type field is 0x00, the value of the Local		When the value of the Type field is 0x00 or 0x02, the value of the
	Administrator sub-field in the Value Field MUST be unique within the		Local Administrator sub-field in the Value Field MUST be unique
	Autonomous system carried in the Global Administrator sub-field.		within the Autonomous system carried in the Global Administrator sub-
			field.
	8. Link Bandwidth Community		8. Link Bandwidth Community
	When a router receives a route from a directly connected external		When a router receives a route from a directly connected external
	neighbor (the external neighbor that is one IP hop away), and		neighbor (the external neighbor that is one IP hop away), and
	advertises this route (via IBGP) to internal neighbors, as part of		advertises this route (via IBGP) to internal neighbors, as part of
	this advertisement the router may carry the bandwidth of the link		this advertisement the router may carry the bandwidth of the link
	that connects the router with the external neighbor. The bandwidth of		that connects the router with the external neighbor. The bandwidth of
	such a link is carried in the Link Bandwidth Community. The community		such a link is carried in the Link Bandwidth Community. The community
	is non-transitive across the Autonomous system boundary.		MAY be marked as non-transitive across the Autonomous system
			boundary.
	The value of the high-order octet of the extended Type Field is 0x40.		If the community is marked as non-transitive, then the value of the
	The value of the low-order octet of the extended type field for this		high-order octet of the extended Type Field is 0x40, otherwise it is
	community is 0x04.		0x00. The value of the low-order octet of the extended type field
			for this community is 0x04.
	The value of the Global Administrator sub-field in the Value Field		The value of the Global Administrator sub-field in the Value Field
	MUST represent the Autonomous System of the router that attaches the		MUST represent the Autonomous System of the router that attaches the
	Link Bandwidth Community. When a router receives a route with the		Link Bandwidth Community. When a router receives a route with the
	community, the router may check the AS number in the Global		community, the router may check the AS number in the Global
	Administrator sub-field to see if its not the local AS and hence		Administrator sub-field to see if its not the local AS and hence
	ignore the information carried in the Link Bandwidth Community.		ignore the information carried in the Link Bandwidth Community.
	The bandwidth of the link is expressed as 4 octets in IEEE floating		The bandwidth of the link is expressed as 4 octets in IEEE floating
	point format, units being bytes per second. It is carried in the		point format, units being bytes per second. It is carried in the
	skipping to change at page 7, line 37		skipping to change at page 7, line 42
	A route may carry both the BGP Communities attribute as defined in		A route may carry both the BGP Communities attribute as defined in
	[RFC1997]), and the Extended BGP Communities attribute. In this case		[RFC1997]), and the Extended BGP Communities attribute. In this case
	the BGP Communities attribute is handled as specified in [RFC1997],		the BGP Communities attribute is handled as specified in [RFC1997],
	and the Extended BGP Communities attribute is handled as specified in		and the Extended BGP Communities attribute is handled as specified in
	this document.		this document.
	10. IANA Considerations		10. IANA Considerations
	For the high-order octet of the Type Field, values 0x00 through 0x03		For the high-order octet of the Type Field, values 0x00 through 0x03
	are assigned in this document and are defined as extended types. For		are assigned in this document and are defined as extended types. For
	the low-order octet of the Type Field, values 0x02 through 0x04 are		the combination of the high-order and low-order octets of the Type
			Field values 0x0002-0x0004, 0x0102-0x0103, and 0x0202-0x0203 are
	assigned in this document.		assigned in this document.
	The Type Field values 0x04-0x3f for regular types (0x0400-0x3fff when		The Type Field values 0x04-0x3f for regular types (0x0400-0x3fff when
	expressed as extended types) are to be assigned by IANA, using the		expressed as extended types) are to be assigned by IANA, using the
	"First Come First Served" policy defined in RFC 2434. The extended		"First Come First Served" policy defined in RFC 2434. The extended
	type field values 0x0005-0x00ff, 0x0104-0x01ff, 0x0200-0x02ff and		type field values 0x0000-0x0001, 0x0005-0x00ff, 0x0100-0x0101,
	0x0300-0x03ff are to be assigned by IANA, using the "First Come First		0x0104-0x01ff, 0x0200-0x0201, 0x0204-0x02ff and 0x0300-0x03ff are to
	Served" policy defined in RFC 2434. Type values 0x80-0xbf for regular		be assigned by IANA, using the "First Come First Served" policy
	types (0x8000-0xbfff when expressed as extended types) are vendor-		defined in RFC 2434. Type values 0x80-0xbf for regular types
	specific types, and values in this range are not to be assigned by		(0x8000-0xbfff when expressed as extended types) are vendor-specific
	IANA.		types, and values in this range are not to be assigned by IANA.
	11. Security Considerations		11. Security Considerations
	This extension to BGP does not change the underlying security issues.		This extension to BGP does not change the underlying security issues.
	12. Acknowledgements		12. Acknowledgements
	The authors would like to thank John Hawkinson, Jeffrey Haas for		The authors would like to thank John Hawkinson, Jeffrey Haas, Bruno
	their feedback.		Rijsman for their suggestions and feedback.
	13. References		13. References
	[BGP-4] Rekhter, Y., and T. Li, "A Border Gateway Protocol 4		[BGP-4] Rekhter, Y., and T. Li, "A Border Gateway Protocol 4
	(BGP-4)", RFC 1771, March 1995.		(BGP-4)", RFC 1771, March 1995.
	[RFC1997] Chandra, R., Traina, P., Li, T., "BGP Communities		[RFC1997] Chandra, R., Traina, P., Li, T., "BGP Communities
	Attribute", RFC1997, August 1996.		Attribute", RFC1997, August 1996.
	14. Author Information		14. Author Information
End of changes.
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