Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Softwarehandbuch
Quality of Service Commands
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M5300, M6100, and M7100 Series ProSAFE Managed Switches
Differentiated Services Commands
This section describes the commands you use to configure QOS Differentiated Services
(DiffServ).
(DiffServ).
You configure DiffServ in several stages by specifying three DiffServ components:
1.
Class
a. Creating and deleting classes.
b. Defining match criteria for a class.
2.
Policy
a. Creating and deleting policies
b. Associating classes with a policy
c. Defining policy statements for a policy/class combination
3.
Service
a. Adding and removing a policy to/from an inbound interface
The DiffServ class defines the packet filtering criteria. The attributes of a DiffServ policy
define the way the switch processes packets. You can define policy attributes on a per-class
instance basis. The switch applies these attributes when a match occurs.
define the way the switch processes packets. You can define policy attributes on a per-class
instance basis. The switch applies these attributes when a match occurs.
Packet processing begins when the switch tests the match criteria for a packet. The switch
applies a policy to a packet when it finds a class match within that policy.
applies a policy to a packet when it finds a class match within that policy.
The following rules apply when you create a DiffServ class:
•
Each class can contain a maximum of one referenced (nested) class
•
Class definitions do not support hierarchical service policies
A given class definition can contain a maximum of one reference to another class. You can
combine the reference with other match criteria. The referenced class is truly a reference and
not a copy since additions to a referenced class affect all classes that reference it. Changes
to any class definition currently referenced by any other class must result in valid class
not a copy since additions to a referenced class affect all classes that reference it. Changes
to any class definition currently referenced by any other class must result in valid class
Term
Definition
Queue ID
An interface supports n queues numbered 0 to (n-1). The specific n value is platform
dependent.
WRED Minimum Threshold
The configured minimum threshold the queue depth (as a percentage) where WRED
starts marking and dropping traffic.
starts marking and dropping traffic.
WRED Maximum Threshold
The configured maximum threshold is the queue depth (as a percentage) above
which WRED marks / drops all traffic.
which WRED marks / drops all traffic.
WRED Drop Probability
The configured percentage probability that WRED will mark/drop a packet, when the
queue depth is at the maximum threshold. (The drop probability increases linearly
from 0 just before the minimum threshold, to this value at the maximum threshold,
then goes to 100% for larger queue depths).
queue depth is at the maximum threshold. (The drop probability increases linearly
from 0 just before the minimum threshold, to this value at the maximum threshold,
then goes to 100% for larger queue depths).