Alcatel-Lucent 7750 SR OS Service Manual page 1017

The match-qinq-dot1p command allows the top or bottom PBits to be used when evaluating the
applied sap-ingress QoS policy's Dot1P entries. The top and bottom keywords specify which
position should be evaluated for QinQ encapsulated packets.
The no form of the command restores the default dot1p evaluation behavior for the SAP.
By default, the bottom most service delineating Dot1Q tags Dot1P bits are used.
default behavior for Dot1P evaluation when the match-qinq-dot1p command is not executed.
Table 1: Default QinQ and TopQ SAP Dot1P Evaluation
Default
no match-qinq-dot1p - No filtering based on p-bits.
top or bottom must be specified to override the default QinQ dot1p behavior.
Parameters
top — The top parameter is mutually exclusive to the bottom parameter. When the top parameter is
Table 2: Top Position QinQ and TopQ SAP Dot1P Evaluation
7750 SR OS Services Guide
Port / SAP Type
Null
Null
Null
Null
Null
Dot1Q
Dot1Q
Dot1Q
QinQ / TopQ
QinQ / TopQ
QinQ / QinQ
specified, the top most PBits are used (if existing) to match any dot1p dot1p-value entries.
Table 2 defines the dot1p evaluation behavior when the top parameter is specified.
Port / SAP Type
Null
Null
Null
Null
Null
Dot1Q
Dot1Q
Virtual Private Routed Network Services
Existing Packet Tags
None
Dot1P (VLAN-ID 0)
Dot1Q
TopQ BottomQ
TopQ (No BottomQ)
None (Default SAP)
Dot1P (Default SAP VLAN-ID 0)
Dot1Q
TopQ
TopQ BottomQ
TopQ BottomQ
Existing Packet Tags
None
Dot1P (VLAN-ID 0)
Dot1Q
TopQ BottomQ
TopQ (No BottomQ)
None (Default SAP)
Dot1P (Default SAP VLAN-ID 0)
Table 1 defines the
PBits Used for Match
None
Dot1P PBits
Dot1Q PBits
TopQ PBits
TopQ PBits
None
Dot1P PBits
Dot1Q PBits
TopQ PBits
TopQ PBits
BottomQ PBits
PBits Used for Match
None
Dot1P PBits
Dot1Q PBits
TopQ PBits
TopQ PBits
None
Dot1P PBits
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