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Defining CoS Schedulers (J-Web Procedure)

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:

  1. Select Configure > Class of Service > Schedulers.

    Note: 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 for details about all commit options.

  2. Click one of the following options:
    • Add—Adds a scheduler. Enter information into the Schedulers page as described in Table 1.
    • Edit—Modifies an existing scheduler. Enter information into the Schedulers page as described in Table 1.
    • Delete—Deletes an existing scheduler.

Table 1: Schedulers Configuration Page

Field

Function

Your Action

Scheduler name

Specifies the name for a scheduler.

To name a scheduler, type the name—for example, be-scheduler.

Scheduling priority

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:

  • low—Packets in this queue are transmitted last.
  • strict-high—Packets in this queue are transmitted first.
  • To specify no scheduling priority, select the blank check box.

Buffer size

Defines the size of the delay buffer.

By default, queues 0 through 11 are allotted the following percentages of the total available buffer space:

  • Queue 0—75 percent
  • Queue 1—0 percent
  • Queue 2—0 percent
  • Queue 3—5 percent
  • Queue 4—0 percent
  • Queue 5—0 percent
  • Queue 6—0 percent
  • Queue 7—0 percent
  • Queue 8—15 percent
  • Queue 9—0 percent
  • Queue 10—0 percent
  • Queue 11—5 percent

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:

  • To specify no buffer size, select the blank check box.
  • To specify buffer size as a percentage of the total buffer, select Percent and type an integer from 1 through 100.
  • To specify buffer size as the remaining available buffer, select Remainder.

Note: On EX8200 and EX4300 switches, you can specify the buffer size as a temporal value. The queuing algorithm will 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.

Shaping rate

Specifies the rate at which queues transmit packets.

  • To specify shaping rate as a percentage, select Percent and type an integer from 1 through 100.
  • To specify shaping rate as a number, select Rate and enter a value.
  • To specify no shaping rate, select the blank check box.

Transmit rate

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:

  • Queue 0—75 percent
  • Queue 1—0 percent
  • Queue 2—0 percent
  • Queue 3—5 percent
  • Queue 4—0 percent
  • Queue 5—0 percent
  • Queue 6—0 percent
  • Queue 7—0 percent
  • Queue 8—15 percent
  • Queue 9—0 percent
  • Queue 10—0 percent
  • Queue 11—5 percent

To define a transmit rate, select the appropriate option:

  • To enforce the exact transmission rate, select Rate and enter a value.
  • To specify the remaining transmission capacity, select Remainder Available.
  • To specify a percentage of transmission capacity, select Percent and type an integer from 1 through 100.
  • To specify no transmit rate, select the blank check box.

Excess rate

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:

  • To specify a percentage of the excess rate, select Percent and type an integer from 1 through 100.
  • To specify no excess rate, select the blank check box.
 

Related Documentation

 

Published: 2014-04-24

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