Virtual Private LAN Services
7750 SR OS Services Guide Page 521
The QinQ and TopQ SAP PBit marking follows the default behavior devined in Table 19 when qinq-
mark-top-only is not specified.
The dot1p dot1p-value command must be configured without the qinq-mark-top-only parameter to
remove the TopQ PBits only marking restriction.
TopQ No preserved Dot1P bits TopQ PBits marked using dot1p-
value
TopQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
TopQ PBits marked using dot1p-
value, BottomQ PBits preserved
QinQ No preserved Dot1P bits TopQ PBits PBits marked using
dot1p-value, BottomQ PBits
marked with zero
QinQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
TopQ PBits PBits marked using
dot1p-value, BottomQ PBits
marked using preserved value
Table 5: QinQ Mark Top Only Explicit Marking Actions
Egress SAP
Type
Ingress Packet Preserved
Dot1P State
Marked (or Remarked) PBits
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