OAM timestamping

The following tables provide information about OAM timestamping for OAM tests.

Table: Location of OAM timestamping lists the locations where each type of OAM timestamping can occur.

Table: Location of OAM timestamping
Timestamping type	Timestamp location
Timestamping type	Tx	Rx
A	At the edge after enqueue	At the edge before enqueue
B	Before enqueuing	At the edge before enqueue
C	CSM timestamping

Table: Mapping of OAM tests to timestamping lists the mapping of OAM tests to timestamping.

Table: Mapping of OAM tests to timestamping
Test execution	Test	OAM type	MEP and direction	Timestamping type
SAA	eth-cfm	Loopback	SAP Down MEP	A
SAA	eth-cfm	Loopback	SAP Up MEP	A
SAA	eth-cfm	Loopback	Spoke SDP and Mesh SDP Down MEP	A
SAA	eth-cfm	Loopback	Spoke SDP and Mesh SDP Up MEP	A
SAA	eth-cfm	Loopback	Network interface Down MEP	A
SAA	eth-cfm	Linktrace	SAP Down MEP	A
SAA	eth-cfm	Linktrace	SAP Up MEP	A
SAA	eth-cfm	Linktrace	Spoke SDP and Mesh SDP Down MEP	A
SAA	eth-cfm	Linktrace	Spoke SDP and Mesh SDP Up MEP	A
SAA	eth-cfm	Linktrace	Network interface Down MEP	A
SAA	eth-cfm	SLM	SAP Down MEP	A
SAA	eth-cfm	SLM	SAP Up MEP	A
SAA	eth-cfm	SLM	Spoke SDP and Mesh SDP Down MEP	A
SAA	eth-cfm	SLM	Spoke SDP and Mesh SDP Up MEP	A
SAA	eth-cfm	SLM	Network interface Down MEP	A
SAA	eth-cfm	DM	SAP Down MEP	A
SAA	eth-cfm	DM	SAP Up MEP	B
SAA	eth-cfm	DM	Spoke/Mesh SDP Down MEP	A
SAA	eth-cfm	DM	Spoke/Mesh SDP Up MEP	B
SAA	eth-cfm	DM	Network interface Down MEP	A
SAA	lsp-ping	—	—	A
SAA	vccv-ping	—	—	A
SAA	sdp-ping	—	—	A
SAA	vprn-ping	—	—	A
SAA	mac-ping	—	—	A
SAA	icmp-ping	—	—	C
SAA	cpe-ping	—	—	A
On demand	eth-cfm	DM	SAP Down MEP	A
On demand	eth-cfm	DM	SAP Up MEP	B
On demand	eth-cfm	DM	Spoke SDP and Mesh SDP Down MEP	A
On demand	eth-cfm	DM	Spoke SDP and Mesh SDP Up MEP	B
On demand	eth-cfm	DM	Network interface Down MEP	A
On demand	eth-cfm	1DM	SAP Down MEP	B
On demand	eth-cfm	1DM	SAP Up MEP	A
On demand	eth-cfm	1DM	Spoke SDP and Mesh SDP Down MEP	B
On demand	eth-cfm	1DM	Spoke SDP and Mesh SDP Up MEP	A
On demand	eth-cfm	1DM	Network interface Down MEP	B
On demand	twamp/twamp-light	—	Ethernet ports	A
On demand	twamp/twamp-light	—	Non-Ethernet ports	C
On demand	lsp-ping	—	—	A
On demand	vccv-ping	—	—	A
On demand	sdp-ping	—	—	A
On demand	vprn-ping	—	—	A
On demand	mac-ping	—	—	A

Table: Timestamps per OAM Test lists the timestamps per OAM test.

Table: Timestamps per OAM Test
Type	Test	Line card timestamp	Timestamp
Type	Test	Line card timestamp	T1¹	T2²	T3³	T4⁴
CFM	loopback	✓	✓	—	—	✓
	linktrace	✓	✓	—	—	✓
	slm	✓	✓	✓	✓	✓
	two-way-delay	✓	✓	✓	✓	✓
Others	lsp-ping	✓	✓	✓	—	✓
	vccv-ping	✓	✓	✓	—	✓
	sdp-ping	✓	✓	✓	✓	✓
	vprn-ping	✓	✓	✓	✓	✓
	mac-ping	✓	✓	✓	✓	✓
	icmp-ping (with enable icmp-vse)	✓	✓	T2 = T3	T3 = T2	✓