Defining CoS Schedulers (J-Web Procedure)
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 using the Configuration pages:
- Create a scheduler and specify attributes for
it. For a description of scheduler-related fields, see Table 1.
- Associate the scheduler to a forwarding class.
Because the forwarding class is assigned to a queue number, the queue
inherits this scheduler's attributes. For a description of scheduler
map-related fields, see Table 1.
Table 1: Schedulers Configuration Page Summary
|
Field
|
Function
|
Your Action
|
| Scheduler
Summary
|
|
Scheduler Name
|
Displays the names of defined schedulers.
Allows you to edit a specific scheduler.
|
To edit a scheduler, click its name.
|
|
Scheduler Information
|
Displays a summary of defined settings for
a scheduler, such as bandwidth, delay buffer size, and transmit rates.
|
None.
|
|
Add
|
Opens a page that allows you to add a scheduler.
|
Click Add.
|
|
Delete
|
Removes a scheduler.
|
Click Delete.
|
| Add
a Scheduler/Edit Scheduler
|
|
Scheduler Name
|
Specifies the name for a scheduler.
|
To name a scheduler, type the name—for
example, be-scheduler.
|
|
Buffer Size
|
Defines the size of the delay buffer.
By default, queues 0 through 7 have the following percentage
of the total available buffer space:
- Queue 0—95 percent
- Queue 1—0 percent
- Queue 2—0 percent
- Queue 3—0 percent
- Queue 4—0 percent
- Queue 5—0 percent
- Queue 6—0 percent
- Queue 7—5 percent
Note:
A large buffer size value correlates with a greater possibility
of packet delays. This 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 Unconfigured.
- 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.
|
|
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 scheduling priority at different levels in an order
of increasing priority from low to high.
A high-priority queue with a high transmission rate might lock
out lower-priority traffic.
|
To specify a priority, select one:
-
low—Packets in this queue are
transmitted last.
-
strict—high—Packets in
this queue are transmitted first.
|
|
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 7 have the following percentage
of transmission capacity:
- Queue 0—95 percent
- Queue 1—0 percent
- Queue 2—0 percent
- Queue 3—5 percent
- Queue 4—0 percent
- Queue 6—0 percent
- Queue 7—5 percent
|
To define a transmit rate, select the appropriate
option:
- To not specify transmit rate, select Unconfigured.
- 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 enforce the exact transmission rate or percentage
you configured, select the Exact Transmit Rate check box.
|
Table 2: Scheduler Maps Configuration Page Summary
|
Field
|
Function
|
Your Action
|
| Scheduler
Maps Summary
|
|
Scheduler Map Name
|
Displays the names of defined scheduler maps.
Scheduler maps link schedulers to forwarding classes.
Allows you to edit a scheduler map.
|
To edit a scheduler map, click its name.
|
|
Scheduler Map Information
|
For each map, displays the schedulers and
the forwarding classes that they are assigned to.
|
None.
|
|
Add
|
Opens a page that allows you to add a scheduler
map.
|
Click Add.
|
|
Delete
|
Removes a scheduler map.
|
Select it and click Delete.
|
| Add
a Scheduler Map/Edit Scheduler Map
|
|
Scheduler Map Name
|
Specifies the name for a scheduler map.
|
To name a map, type the name—for example, be-scheduler-map.
|
|
Scheduler Mapping
|
Allows you to associate a preconfigured scheduler
with a forwarding class.
After scheduler maps have been applied to an interface, they
affect the hardware queues, packet schedulers.
|
To associate a scheduler with a forwarding
class, locate the forwarding class and select the scheduler in the
box next to it.
|
