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Hitachi Gigabit Router GR2000 Series Enhanced Version Configuration Commands, Vol. 2
1-132 GR2K-GA-0014
Ver. 07-02
3. Queue control
When there is a backlog on the output queue, packets remaining on the queue
are transmitted or discarded depending on priority. The QoS discard mode
command (qos-discard-mode) sets queue size and enables queuing by priority
class.
1.2.4 qos-discard-mode
Figure 1-6 Range of QoS Discard Mode Control
4. Flow control
The flow-control function identifies incoming IP packets by their flow-control
settings, determines priority, rewrites TOS, and manages reserved bandwidths.
The flow control includes two input form for configuration definition. Features of
each input form are shown in Table 1-65.
For the configuration definition flow qos, please refer to Subsection 1.1.7 "flow
qos". The configuration definitions qos-ip-list, qos-list-group, and qos-ip are
described below.
The QoS IP list (qos-ip-list) command generates lists defining flow detection
conditions and the various types of flow control active in flow detection. The QoS
IP list group (qos-ip-list-group) command assigns a decision order to lists, allowing
Table 1-65 Features of Constituting Definition of Filter Flow Information by Input Form
Item
Constituting Definition Inputting Form
qos-ip-list, qos-ip-list-group,
qos-ip
flow filter
Number of entry(*1) 1024 entry/device 10000 entry/device 2000 entry/RP
Inputting form Input three commands to define one
list. Effective in defining the same
flow control in multiple number of
input/output interfaces.
Input one command to define one
list. Effective in inputting a number of
entries.
Function use, and unused
unit
Device unit Device unit, and input/output
interface unit
Operation command
Indication unit for qos ip
flow.
Device unit and list unit Device unit and input/output
interface unit
Vacant entry indication Supported. Unsupported.
*1: Total value with entries of filters.
Sets from qos-discard-lis
Flow Control (input)
Transmission Control
Flow Detection
: Control range of this command
Interface
(LINE,DLCI, etc.)
Route Search
Priority Determination
TOS Rewrite
Contracted Bandwidth
Monitoring
Queue Control
Flow Control (output)
Flow Detection
Priority Determination
TOS Rewrite
Contracted Bandwidth
Monitoring
Sets from qos-discard-mode