Alcatel-Lucent 7750 SR Manual page 709

The QinQ and TopQ SAP PBit marking follows the default behavior defined in the above tables 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.
7750 SR OS Services Guide
Egress SAP Ingress Packet Preserved
Type
Null No preserved Dot1P bits
Null Preserved Dot1P bits
Dot1Q No preserved Dot1P bits
Dot1Q Preserved Dot1P bits
TopQ No preserved Dot1P bits
TopQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
QinQ No preserved Dot1P bits
QinQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
Egress SAP Ingress Packet Preserved
Type
Null No preserved Dot1P bits
Null Preserved Dot1P bits
Dot1Q No preserved Dot1P bits
Dot1Q Preserved Dot1P bits
TopQ No preserved Dot1P bits
TopQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
QinQ No preserved Dot1P bits
QinQ Preserved Dot1P bits (used as TopQ
and BottomQ PBits)
Dot1P State
Dot1P State
Virtual Private LAN Services
Marked (or Remarked) PBits
None
Preserved tag PBits remarked using
dot1p-value
New PBits marked using dot1p-value
Preserved tag PBits remarked using
dot1p-value
TopQ PBits marked using dot1p-value
TopQ PBits marked using dot1p-value,
BottomQ PBits preserved
TopQ PBits and BottomQ PBits marked
using dot1p-value
TopQ PBits and BottomQ PBits marked
using dot1p-value
Marked (or Remarked) PBits
None
Preserved tag PBits remarked using
dot1p-value
New PBits marked using dot1p-value
Preserved tag PBits remarked using
dot1p-value
TopQ PBits marked using dot1p-value
TopQ PBits marked using dot1p-value,
BottomQ PBits preserved
TopQ PBits marked using dot1p-value,
BottomQ PBits marked with zero
TopQ PBits marked using dot1p-value,
BottomQ PBits marked using preserved
value
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