rfc9746v2.txt		rfc9746.txt
	Internet Engineering Task Force (IETF) J. Rabadan, Ed.		Internet Engineering Task Force (IETF) J. Rabadan, Ed.
	Request for Comments: 9746 K. Nagaraj		Request for Comments: 9746 K. Nagaraj
	Updates: 7432, 8365 Nokia		Updates: 7432, 8365 Nokia
	Category: Standards Track W. Lin		Category: Standards Track W. Lin
	ISSN: 2070-1721 Juniper		ISSN: 2070-1721 Juniper
	A. Sajassi		A. Sajassi
	Cisco		Cisco
	February 2025		March 2025
	BGP EVPN Multihoming Extensions for Split Horizon Filtering		BGP EVPN Multihoming Extensions for Split-Horizon Filtering
	Abstract		Abstract
	An Ethernet Virtual Private Network (EVPN) is commonly used with		An Ethernet Virtual Private Network (EVPN) is commonly used with
	Network Virtualization Overlay (NVO) tunnels as well as with MPLS and		Network Virtualization Overlay (NVO) tunnels as well as with MPLS and
	Segment Routing (SR) tunnels. The multihoming procedures in EVPN may		Segment Routing (SR) tunnels. The multihoming procedures in EVPN may
	vary based on the type of tunnel used within the EVPN Broadcast		vary based on the type of tunnel used within the EVPN Broadcast
	Domain. Specifically, there are two multihoming split-horizon		Domain. Specifically, there are two multihoming split-horizon
	procedures designed to prevent looped frames on multihomed Customer		procedures designed to prevent looped frames on multihomed Customer
	Edge (CE) devices: the Ethernet Segment Identifier (ESI) Label-based		Edge (CE) devices: the Ethernet Segment Identifier (ESI) Label-based
	skipping to change at line 450 ¶		skipping to change at line 450 ¶
	(which is equivalent to processing them as a value of 00).		(which is equivalent to processing them as a value of 00).
	* SHT = 01 indicates that the advertising NVE intends to use local-		* SHT = 01 indicates that the advertising NVE intends to use local-
	bias procedures in the ES for which the AD per-ES route is		bias procedures in the ES for which the AD per-ES route is
	advertised.		advertised.
	* SHT = 10 indicates that the advertising NVE intends to use the ESI		* SHT = 10 indicates that the advertising NVE intends to use the ESI
	Label-based split-horizon method procedures in the ES for which		Label-based split-horizon method procedures in the ES for which
	the AD per-ES route is advertised.		the AD per-ES route is advertised.
	* SHT = 11 is a reserved value, for future use.		* SHT = 11 is Unassigned.
	2.2. Use of the Split-Horizon Type in A-D per ES Routes		2.2. Use of the Split-Horizon Type in A-D per ES Routes
	The following behavior is observed:		The following behavior is observed:
	* An SHT value of 01 or 10 MUST NOT be used with encapsulations that		* An SHT value of 01 or 10 MUST NOT be used with encapsulations that
	support only one SHT in Table 1, and MAY be used by encapsulations		support only one SHT in Table 1, and MAY be used by encapsulations
	that support the two SHTs in Table 1.		that support the two SHTs in Table 1.
	* An SHT value different than 00 expresses the intent to use a		* An SHT value different than 00 expresses the intent to use a
End of changes. 3 change blocks.
	3 lines changed or deleted		3 lines changed or added
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