rfc9800v2.txt		rfc9800.txt
	skipping to change at line 431 ¶		skipping to change at line 431 ¶
	When processing an IPv6 packet that matches a FIB entry locally		When processing an IPv6 packet that matches a FIB entry locally
	instantiated as an End SID with the NEXT-CSID flavor, the procedure		instantiated as an End SID with the NEXT-CSID flavor, the procedure
	described in Section 4.1 of [RFC8986] is executed with the following		described in Section 4.1 of [RFC8986] is executed with the following
	modifications.		modifications.
	The below pseudocode is inserted between lines S01 and S02 of the SRH		The below pseudocode is inserted between lines S01 and S02 of the SRH
	processing in Section 4.1 of [RFC8986]. In addition, this pseudocode		processing in Section 4.1 of [RFC8986]. In addition, this pseudocode
	is executed before processing the first header in the IPv6 extension		is executed before processing the first header in the IPv6 extension
	header chain that is not an SRH, a Hop-by-Hop header, or a		header chain that is not an SRH, a Hop-by-Hop header, or a
	Destination Options header. If the IPv6 extension header chain does		Destination Options header. If the IPv6 extension header chain does
	not include any header matching this criteria, this pseudocode is		not include any header matching this criterion, this pseudocode is
	executed before processing the upper-layer header.		executed before processing the upper-layer header.
	N01. If (DA.Argument != 0) {		N01. If (DA.Argument != 0) {
	N02. If (IPv6 Hop Limit <= 1) {		N02. If (IPv6 Hop Limit <= 1) {
	N03. Send an ICMP Time Exceeded message to the Source Address,		N03. Send an ICMP Time Exceeded message to the Source Address,
	Code 0 (Hop limit exceeded in transit),		Code 0 (Hop limit exceeded in transit),
	interrupt packet processing and discard the packet.		interrupt packet processing and discard the packet.
	N04. }		N04. }
	N05. Copy DA.Argument into the bits [LBL..(LBL+AL-1)] of the		N05. Copy DA.Argument into the bits [LBL..(LBL+AL-1)] of the
	Destination Address.		Destination Address.
	skipping to change at line 482 ¶		skipping to change at line 482 ¶
	new destination via a member of J.		new destination via a member of J.
	| Note: the variable J is defined in Section 4.2 of [RFC8986].		| Note: the variable J is defined in Section 4.2 of [RFC8986].
	The resulting pseudocode is inserted between lines S01 and S02 of the		The resulting pseudocode is inserted between lines S01 and S02 of the
	SRH processing in Section 4.1 of [RFC8986] after applying the		SRH processing in Section 4.1 of [RFC8986] after applying the
	modification described in Section 4.2 of [RFC8986]. In addition,		modification described in Section 4.2 of [RFC8986]. In addition,
	this pseudocode is executed before processing the first header in the		this pseudocode is executed before processing the first header in the
	IPv6 extension header chain that is not an SRH, a Hop-by-Hop header,		IPv6 extension header chain that is not an SRH, a Hop-by-Hop header,
	or a Destination Options header. If the IPv6 extension header chain		or a Destination Options header. If the IPv6 extension header chain
	does not include any header matching this criteria, this pseudocode		does not include any header matching this criterion, this pseudocode
	is executed before processing the upper-layer header.		is executed before processing the upper-layer header.
	A rendering of the complete pseudocode is provided in Appendix A.2.		A rendering of the complete pseudocode is provided in Appendix A.2.
	4.1.3. End.T with NEXT-CSID		4.1.3. End.T with NEXT-CSID
	When processing an IPv6 packet that matches a FIB entry locally		When processing an IPv6 packet that matches a FIB entry locally
	instantiated as an End.T SID with the NEXT-CSID flavor, the procedure		instantiated as an End.T SID with the NEXT-CSID flavor, the procedure
	described in Section 4.3 of [RFC8986] is executed with the following		described in Section 4.3 of [RFC8986] is executed with the following
	modifications.		modifications.
	skipping to change at line 509 ¶		skipping to change at line 509 ¶
	transmission to the new destination.		transmission to the new destination.
	| Note: the variable T is defined in Section 4.3 of [RFC8986].		| Note: the variable T is defined in Section 4.3 of [RFC8986].
	The resulting pseudocode is inserted between lines S01 and S02 of the		The resulting pseudocode is inserted between lines S01 and S02 of the
	SRH processing in Section 4.1 of [RFC8986] after applying the		SRH processing in Section 4.1 of [RFC8986] after applying the
	modification described in Section 4.3 of [RFC8986]. In addition,		modification described in Section 4.3 of [RFC8986]. In addition,
	this pseudocode is executed before processing the first header in the		this pseudocode is executed before processing the first header in the
	IPv6 extension header chain that is not an SRH, a Hop-by-Hop header,		IPv6 extension header chain that is not an SRH, a Hop-by-Hop header,
	or a Destination Options header. If the IPv6 extension header chain		or a Destination Options header. If the IPv6 extension header chain
	does not include any header matching this criteria, this pseudocode		does not include any header matching this criterion, this pseudocode
	is executed before processing the upper-layer header.		is executed before processing the upper-layer header.
	A rendering of the complete pseudocode is provided in Appendix A.3.		A rendering of the complete pseudocode is provided in Appendix A.3.
	4.1.4. End.B6.Encaps with NEXT-CSID		4.1.4. End.B6.Encaps with NEXT-CSID
	When processing an IPv6 packet that matches a FIB entry locally		When processing an IPv6 packet that matches a FIB entry locally
	instantiated as an End.B6.Encaps SID with the NEXT-CSID flavor, the		instantiated as an End.B6.Encaps SID with the NEXT-CSID flavor, the
	procedure described in Section 4.13 of [RFC8986] is executed with the		procedure described in Section 4.13 of [RFC8986] is executed with the
	following modifications.		following modifications.
	skipping to change at line 541 ¶		skipping to change at line 541 ¶
	| Note: the variables A and B, as well as the values of the		| Note: the variables A and B, as well as the values of the
	| Payload Length, Traffic Class, Flow Label, Hop Limit, and Next		| Payload Length, Traffic Class, Flow Label, Hop Limit, and Next
	| Header are defined in Section 4.13 of [RFC8986].		| Header are defined in Section 4.13 of [RFC8986].
	The resulting pseudocode is inserted between lines S01 and S02 of the		The resulting pseudocode is inserted between lines S01 and S02 of the
	SRH processing in Section 4.13 of [RFC8986]. In addition, this		SRH processing in Section 4.13 of [RFC8986]. In addition, this
	pseudocode is executed before processing the first header in the IPv6		pseudocode is executed before processing the first header in the IPv6
	extension header chain that is not an SRH, a Hop-by-Hop header, or a		extension header chain that is not an SRH, a Hop-by-Hop header, or a
	Destination Options header. If the IPv6 extension header chain does		Destination Options header. If the IPv6 extension header chain does
	not include any header matching this criteria, this pseudocode is		not include any header matching this criterion, this pseudocode is
	executed before processing the upper-layer header.		executed before processing the upper-layer header.
	A rendering of the complete pseudocode is provided in Appendix A.4.		A rendering of the complete pseudocode is provided in Appendix A.4.
	Similar to the base End.B6.Encaps SID defined in Section 4.13 of		Similar to the base End.B6.Encaps SID defined in Section 4.13 of
	[RFC8986], the NEXT-CSID flavor variant updates the Destination		[RFC8986], the NEXT-CSID flavor variant updates the Destination
	Address field of the inner IPv6 header to the next SID in the		Address field of the inner IPv6 header to the next SID in the
	original segment list before encapsulating the packet with the		original segment list before encapsulating the packet with the
	segment list of SR Policy B. At the endpoint of SR Policy B, the		segment list of SR Policy B. At the endpoint of SR Policy B, the
	encapsulation is removed and the inner packet is forwarded towards		encapsulation is removed and the inner packet is forwarded towards
	skipping to change at line 584 ¶		skipping to change at line 584 ¶
	N08.1. Push the MPLS label stack for B.		N08.1. Push the MPLS label stack for B.
	N08.2. Submit the packet to the MPLS engine for transmission.		N08.2. Submit the packet to the MPLS engine for transmission.
	| Note: the variable B is defined in Section 4.15 of [RFC8986].		| Note: the variable B is defined in Section 4.15 of [RFC8986].
	The resulting pseudocode is inserted between lines S01 and S02 of the		The resulting pseudocode is inserted between lines S01 and S02 of the
	SRH processing in Section 4.15 of [RFC8986]. In addition, this		SRH processing in Section 4.15 of [RFC8986]. In addition, this
	pseudocode is executed before processing the first header in the IPv6		pseudocode is executed before processing the first header in the IPv6
	extension header chain that is not an SRH, a Hop-by-Hop header, or a		extension header chain that is not an SRH, a Hop-by-Hop header, or a
	Destination Options header. If the IPv6 extension header chain does		Destination Options header. If the IPv6 extension header chain does
	not include any header matching this criteria, this pseudocode is		not include any header matching this criterion, this pseudocode is
	executed before processing the upper-layer header.		executed before processing the upper-layer header.
	A rendering of the complete pseudocode is provided in Appendix A.5.		A rendering of the complete pseudocode is provided in Appendix A.5.
	4.1.7. Combination with PSP, USP, and USD Flavors		4.1.7. Combination with PSP, USP, and USD Flavors
	PSP: The PSP flavor defined in Section 4.16.1 of [RFC8986] is		PSP: The PSP flavor defined in Section 4.16.1 of [RFC8986] is
	unchanged when combined with the NEXT-CSID flavor.		unchanged when combined with the NEXT-CSID flavor.
	USP: The USP flavor defined in Section 4.16.2 of [RFC8986] is		USP: The USP flavor defined in Section 4.16.2 of [RFC8986] is
	skipping to change at line 1195 ¶		skipping to change at line 1195 ¶
	This method walks the uncompressed SID list and compresses each		This method walks the uncompressed SID list and compresses each
	series of consecutive NEXT-CSID flavor SIDs and each series of		series of consecutive NEXT-CSID flavor SIDs and each series of
	consecutive REPLACE-CSID flavor SIDs.		consecutive REPLACE-CSID flavor SIDs.
	* When the compression method encounters a series of one or more		* When the compression method encounters a series of one or more
	consecutive compressible NEXT-CSID flavor SIDs, it compresses the		consecutive compressible NEXT-CSID flavor SIDs, it compresses the
	series as follows. A SID with the NEXT-CSID flavor is		series as follows. A SID with the NEXT-CSID flavor is
	compressible if its structure is known to the SR source node and		compressible if its structure is known to the SR source node and
	its Argument value is 0.		its Argument value is 0.
	S01. Initialize a NEXT-CSID container equal to the first SID in the		S01. Initialize a NEXT-CSID container equal to the first SID in
	series and initialize the remaining capacity of the CSID		the series and initialize the remaining capacity of the
	container to the AL of that SID		CSID container to the AL of that SID
	S02. For each subsequent SID in the series {		S02. For each subsequent SID in the series {
	S03. If the current SID Locator-Block matches that of the CSID		S03. If the current SID Locator-Block matches that of the CSID
	container and the current SID LNFL is lower than or equal to		container and the current SID LNFL is lower than or equal
	the remaining capacity of the NEXT-CSID container {		to the remaining capacity of the NEXT-CSID container {
	S04. Copy the current SID Locator-Node and Function to the most		S04. Copy the current SID Locator-Node and Function to the
	significant remaining Argument bits of the NEXT-CSID		most significant remaining Argument bits of the
	container and decrement the remaining capacity by LNFL		NEXT-CSID container and decrement the remaining
			capacity by LNFL
	S05. } Else {		S05. } Else {
	S06. Push the NEXT-CSID container onto the compressed SID list		S06. Push the NEXT-CSID container onto the compressed SID list
	S07. Initialize a new NEXT-CSID container equal to the current		S07. Initialize a new NEXT-CSID container equal to the current
	SID in the series and initialize the remaining capacity		SID in the series and initialize the remaining capacity
	of the NEXT-CSID container to the AL of that SID		of the NEXT-CSID container to the AL of that SID
	S08. } // End If		S08. } // End If
	S09. } // End For		S09. } // End For
	S10. If at least one SID remains in the uncompressed SID list		S10. If at least one SID remains in the uncompressed SID list
	(following the series of compressible NEXT-CSID flavor SIDs){		(following the series of compressible NEXT-CSID flavor
			SIDs) {
	S11. Set S to the next SID in the uncompressed SID list		S11. Set S to the next SID in the uncompressed SID list
	S12. If S is advertised with a SID structure, and the Locator-Block		S12. If S is advertised with a SID structure, and the
	of S matches that of the NEXT-CSID container, and the sum of		Locator-Block of S matches that of the NEXT-CSID
	the Locator-Node, Function, and Argument length of S is		container, and the sum of the Locator-Node, Function, and
	lower than or equal to the remaining capacity of the CSID		Argument length of S is lower than or equal to the
	container {		remaining capacity of the CSID container {
	S13. Copy the Locator-Node, Function, and Argument of S to the		S13. Copy the Locator-Node, Function, and Argument of S to the
	most significant remaining Argument bits of the CSID		most significant remaining Argument bits of the CSID
	container		container
	S14. } // End If		S14. } // End If
	S15. } // End If		S15. } // End If
	S16. Push the NEXT-CSID container onto the compressed SID list		S16. Push the NEXT-CSID container onto the compressed SID list
	* When the compression method encounters a series of REPLACE-CSID		* When the compression method encounters a series of REPLACE-CSID
	flavor SIDs of the same CSID length in the uncompressed SID list,		flavor SIDs of the same CSID length in the uncompressed SID list,
	it compresses the series as per the following high-level		it compresses the series as per the following high-level
	pseudocode. A compression checking function ComCheck(F, S) is		pseudocode. A compression checking function ComCheck(F, S) is
	defined to check if two SIDs F and S share the same SID structure		defined to check if two SIDs F and S share the same SID structure
	and Locator-Block value, and if S has either no Argument or an		and Locator-Block value, and if S has either no Argument or an
	Argument with value 0. If the check passes, then ComCheck(F,S)		Argument with value 0. If the check passes, then ComCheck(F,S)
	returns true.		returns true.
	S01. Initialize a REPLACE-CSID container in full SID format equal to		S01. Initialize a REPLACE-CSID container in full SID format equal
	the first SID in the series		to the first SID in the series
	S02. Push the REPLACE-CSID container onto the compressed SID list		S02. Push the REPLACE-CSID container onto the compressed SID list
	S03. Initialize a new REPLACE-CSID container in packed format if		S03. Initialize a new REPLACE-CSID container in packed format if
	there are more than one SIDs and initialize the remaining		there are more than one SIDs and initialize the remaining
	capacity of the REPLACE-CSID container to 128 bits		capacity of the REPLACE-CSID container to 128 bits
	S04. For each subsequent SID in the uncompressed SID list {		S04. For each subsequent SID in the uncompressed SID list {
	S05. Set S to the current SID in the uncompressed SID list		S05. Set S to the current SID in the uncompressed SID list
	S06. If ComCheck(First SID, S) {		S06. If ComCheck(First SID, S) {
	S07. If the LNFL of S is lower than or equal to		S07. If the LNFL of S is lower than or equal to
	the remaining capacity of the REPLACE-CSID container {		the remaining capacity of the REPLACE-CSID container {
	S08. Copy the Locator-Node and Function of S to the least		S08. Copy the Locator-Node and Function of S to the least
	significant remaining bits of the REPLACE-CSID container		significant remaining bits of the REPLACE-CSID
	and decrement the remaining capacity by LNFL // Note		container and decrement the remaining capacity by
			LNFL // Note
	S09. } Else {		S09. } Else {
	S10. Push the REPLACE-CSID container onto the compressed SID		S10. Push the REPLACE-CSID container onto the compressed SID
	list		list
	S11. Initialize a new REPLACE-CSID container in packed format		S11. Initialize a new REPLACE-CSID container in packed
	with all bits set to 0		format with all bits set to 0
	S12. Copy the Locator-Node and Function of S to the least		S12. Copy the Locator-Node and Function of S to the least
	significant remaining bits of the REPLACE-CSID container		significant remaining bits of the REPLACE-CSID
	and decrement the remaining capacity by LNFL // Note		container and decrement the remaining capacity by
			LNFL // Note
	S13. }		S13. }
	S14. If S is not a REPLACE-CSID flavor SID, then break		S14. If S is not a REPLACE-CSID flavor SID, then break
	S15. } Else {		S15. } Else {
	S16. Break		S16. Break
	S17. } // End If		S17. } // End If
	S18. } // End For		S18. } // End For
	S19. Push the REPLACE-CSID container (if it is not empty) onto the		S19. Push the REPLACE-CSID container (if it is not empty) onto the
	compressed SID list		compressed SID list
	| Note: When the last CSID is an End.DT2M SID with the REPLACE-		| Note: When the last CSID is an End.DT2M SID with the REPLACE-
End of changes. 13 change blocks.
	27 lines changed or deleted		31 lines changed or added
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