Defining CoS Schedulers (J-Web Procedure)
This topic applies only to the J-Web Application package.
J-Web Application package Release 14.1X53-A2 does not support Class of Service (CoS) on EX4600 switches.
You can use the J-Web interface to define CoS schedulers on an EX Series switch. Using schedulers, you can assign attributes to queues and thereby provide congestion control for a particular class of traffic. These attributes include the amount of interface bandwidth, memory buffer size, transmit rate, and schedule priority.
To configure schedulers:
- Select Configure > Class of Service > Schedulers.
After you make changes to the configuration on this page, you must commit the changes immediately for them to take effect. To commit all changes to the active configuration, select Commit Options > Commit. See Using the Commit Options to Commit Configuration Changes (J-Web Procedure) for details about all commit options.
- Select one of the following options:
Table 1: Schedulers Configuration Page
Specifies the name for a scheduler.
To name a scheduler, type the name—for example, be-scheduler.
Sets the transmission priority of the scheduler, which determines the order in which an output interface transmits traffic from the queues.
You can set the scheduling priority at different levels in the order of increasing priority from low to high.
A high-priority queue with a high transmission rate might lock out lower-priority traffic.
To set a priority, select one:
To specify no scheduling priority, select the blank check box.
Defines the size of the delay buffer.
By default, queues 0 through 11 are allotted the following percentages of the total available buffer space:
Note: A large buffer size value correlates with a greater possibility of packet delays. Such a value might not be practical for sensitive traffic such as voice or video.
To define a delay buffer size for a scheduler, select the appropriate option:
Note: On EX8200 and EX4300 switches, you can specify the buffer size as a temporal value. The queuing algorithm then drop packets after it has queued a computed number of bytes. This number is the product of the logical interface speed and the configured temporal value.
Specifies the rate at which queues transmit packets.
Defines the transmission rate of a scheduler.
The transmit rate determines the traffic bandwidth from each forwarding class you configure.
By default, queues 0 through 11 are allotted the following percentages of the transmission capacity:
To define a transmit rate, select the appropriate option:
Note: This option is supported only on EX4300 switches.
Defines the excess rate of a scheduler.
To define the excess rate, select the appropriate option: