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Hitachi Gigabit Router GR2000 Series Enhanced Version Configuration Commands, Vol. 2
1-2 GR2K-GA-0014
Ver. 07-02
1.1 Flow Information
The flow control can be divided into the IPv4 flow control noticing on the IPv4 packet
and the IPv6 noticing on the IPv6 packet. Explanations are given hereunder on the
respective functions, followed by explanations on the constituting definition
commands and parameters that define the information given about this flow control.
1.1.1 IPv4 Flow Control
The IPv4 flow control is provided with the filter function to relay or discard the packet
and the QoS function (the flow control part) to decide the priority for signaling by
packet types.
The flow control is set on both interface’s input and output side.. The first stage
executes mainly the filter function while the second stage executes mainly the QoS
function (flow control part) in each of the input and output sides. The packet
performsdeterminationontheflowcontrolintheorderof(a)thefilterfunctionon
the first input side stage, (b) the QoS function on the second input side stage, (c) the
filter function on the first output side stage, and (d) the QoS function on the second
output side stage.
Abriefexplanationonthecontentsisgivenoneachcontrolblockconstitutingthe
flow control as are the related constituting definition commands.
Figure 1-1 Range of QoS, Filter-Flow Control
Flow Control (input)
Flow Control (output)
Policy routing
Filtring
DSCP Rewrite
F
iltring
DSCP Rewrite
Connection
branching
Interface
(LINE, DLCI,
Transmission Control
8 Queues
Que control
Priority
Determination
DSCP Rewrite
Contracted
Bandwidth
Monitoring
Priority
Determination
DSCP Rewrite
Contracted
Bandwidth
Monitoring
EXP Rewrite
Connection
branching
Switch
Flow block setting range
Flow of packet
Flow Detection
Flow Detection
Flow Detection
Flow Detection