802.1ad S-VLAN (`dot1ad`)

Layer: L2 (data link)
Header: 4 octets (fixed)

Reached from

Lower layer	Selector	Value
`ethernet2`	`ethertype`	34984 (0x88a8)
`dot1q`	`ethertype`	34984 (0x88a8)
`dot1ad`	`ethertype`	34984 (0x88a8)

Fields

Field	Type	Default	Auto	Description
`pcp`	`uint(3)`	`0`		Priority code point (802.1p class of service, 0 to 7).
`dei`	`uint(1)`	`0`		Drop eligible indicator.
`vid`	`uint(12)`	`1`		VLAN identifier (1 to 4094; 0 = priority tag only, 4095 is reserved).
`ethertype`	`enum(16)`	`33024` (vlan)	Protocol number of the next layer (see Next layer)	EtherType of the layer after the S-tag (Auto; normally 0x8100 for the 802.1Q C-tag).

`ethertype`

Value	Name
2048 (0x0800)	`ipv4`
2054 (0x0806)	`arp`
33024 (0x8100)	`vlan`
34525 (0x86dd)	`ipv6`
34984 (0x88a8)	`qinq`
34997 (0x88b5)	`local_experimental`
35063 (0x88f7)	`ptp`
35074 (0x8902)	`cfm`

Next layer

The next layer is selected by ethertype; when the field is Auto the builder writes the value of the protocol stacked above.

Value	Protocol	Note
33024 (0x8100)	`dot1q`
34984 (0x88a8)	`dot1ad`
2048 (0x0800)	`ipv4`
34525 (0x86dd)	`ipv6`
2054 (0x0806)	`arp`
35063 (0x88f7)	`ptp`
35063 (0x88f7)	`ptp_sync`
35063 (0x88f7)	`ptp_delay_req`
35063 (0x88f7)	`ptp_pdelay_req`
35063 (0x88f7)	`ptp_pdelay_resp`
35063 (0x88f7)	`ptp_follow_up`
35063 (0x88f7)	`ptp_delay_resp`
35063 (0x88f7)	`ptp_pdelay_resp_follow_up`
35063 (0x88f7)	`ptp_announce`
35063 (0x88f7)	`ptp_signaling`
35063 (0x88f7)	`ptp_management`
35074 (0x8902)	`cfm`
35074 (0x8902)	`cfm_ccm`
35074 (0x8902)	`cfm_lbr`
35074 (0x8902)	`cfm_lbm`
35074 (0x8902)	`cfm_ltr`
35074 (0x8902)	`cfm_ltm`
35074 (0x8902)	`cfm_ais`
35074 (0x8902)	`cfm_lck`
35074 (0x8902)	`cfm_tst`
35074 (0x8902)	`cfm_raps`
35074 (0x8902)	`cfm_lmr`
35074 (0x8902)	`cfm_lmm`
35074 (0x8902)	`cfm_1dm`
35074 (0x8902)	`cfm_dmr`
35074 (0x8902)	`cfm_dmm`
35074 (0x8902)	`cfm_csf`
35074 (0x8902)	`cfm_1sl`
35074 (0x8902)	`cfm_slr`
35074 (0x8902)	`cfm_slm`

Constraints

Level	Rule
warning	`vid` ≠ 4095

Sample templates

dot1ad-qinq-frame — templates/protocols/l2/dot1ad.wpg.yaml
scenario-qinq-service-sweep — templates/scenarios/qinq-service-sweep.wpg.yaml