Hitachi GR2000 Series Manual do Utilizador Página 45

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Filtering/QoS Information
GR2K-GA-0014 1-3
Ver. 07-02
Filter function on the first input side stage
The first input side stage executes the following functions:
Filtering: Relays or discards the packet in accordance with the flow
detecting condition.
DSCP rewriting: Rewrites the DSCP field in accordance with the flow detecting
condition.
Policy routing: Transmits the packet to the specified output destination in
accordance with the flow detecting condition.
Constituting definition command
1, 2 flow filters (filter flow information)
QoS function on the second input side stage (flow control part)
The second input side stage executes the following functions:
Priority determination:
Determines the priority of the packet that agrees with the flow
detecting condition.
DSCP rewriting: Rewrites the DSCP field of the packet that agrees with the flow
detecting condition.
Contract band monitoring:
Monitors if the packet that agrees with the flow detecting
condition is following or violating the contract band.
Constituting definition command
1, 3 flow filters (QoS flow information)
Filter function on the first output side stage
The first input side stage executes the following functions:
Filtering: Relays or discards the packet in accordance with the flow
detecting condition.
DSCP rewriting: Rewrites the DSCP field in accordance with the flow detecting
condition.
Connection branching:
Selects and transmits the packet to the specified DLCI/VC in
accordance with the flow detecting condition.
Constituting definition command
1, 2 flow filters (filter flow information)
Filter function on the second output side stage (flow control part)
The second output side stage executes the following functions:
Priority determination:
Determines the priority of the packet that agrees with the flow
detecting condition.
DSCP rewriting: Rewrites the DSCP field of the packet that agrees with the flow
detecting condition.
Contract band monitoring:
Monitors if the packet that agrees with the flow detecting
condition is following or violating the contract band.
EXP rewriting: Rewrites the EXP field of the packet that agrees with the flow
detecting condition.
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