Shared scheduling and shaping allows you to allocate
separate pools of shared resources to subsets of logical interfaces
belonging to the same physical port. You configure shared
scheduling and shaping by first creating a traffic-control profile,
which specifies a shaping rate and references a scheduler map. You
must then share this set of shaping and scheduling resources by applying
an instance of the traffic-control profile to a subset of logical
interfaces. You can apply a separate instance of the same (or a different)
traffic-control profile to another subset of logical interfaces, thereby
allocating separate pools of shared resources.
Before you start this procedure:
To configure a traffic-control profile, perform
the following steps:
- Create the traffic control profile and configure a shaping
rate for it.
[edit]
user@host# edit class-of-service traffic-control-profiles profile-name
user@host# set shaping-rate (percent percentage | rate)
You can configure the shaping rate as a percentage from 1
through 100 or as an absolute rate from 1000 through 6,400,000,000,000 bits
per second (bps). The shaping rate corresponds to a peak information
rate (PIR). For more information, see Oversubscribing Interface Bandwidth.
- Define an association between the traffic-control profile
and a previously configured scheduler map by including the
scheduler-map statement at the [edit class-of-service traffic-control-profiles profile-name] hierarchy level.[edit class-of-service traffic-control-profiles profile-name]
user@host# set scheduler-map map-name;
- Configure the delay-buffer rate.
If you do not include this statement, the delay-buffer rate
is based on the guaranteed rate if one is configured, or on the shaping
rate if no guaranteed rate is configured.
[edit class-of-service traffic-control-profiles profile-name]
user@host# set delay-buffer-rate (percent percentage | rate)
You can configure the delay-buffer rate as a percentage
from 1 through 100 or as an absolute rate from 1000 through 6,400,000,000,000 bits
per second. The delay-buffer rate controls latency. For more information,
see Oversubscribing Interface Bandwidth and Providing a Guaranteed Minimum Rate.
- Configure a guaranteed minimum rate for the traffic-control
profile.
[edit class-of-service traffic-control-profiles profile-name]
user@host# set guaranteed-rate (percent percentage | rate)
You can configure the guaranteed rate as a percentage from 1 through
100 or as an absolute rate from 1000 through 6,400,000,000,000 bps.
The guaranteed rate corresponds to a committed information rate (CIR).
For more information, see Providing a
Guaranteed Minimum Rate.
You must now share an instance of the traffic-control profile.
- Enable shared-scheduling on the interface.
[edit]
user@host# edit interfaces interface-name
user@host# set shared-scheduler
This statement enables logical interfaces belonging to the same
physical port to share one set of shaping and scheduling resources.
Note: On each physical interface, the shared-scheduler and per-unit-scheduler statements are mutually exclusive.
Even so, you can configure one logical interface for each shared instance.
This effectively provides the functionality of per-unit scheduling.
- (Optional) Apply the traffic-control profile to an input
interface.
[edit]
user@host# edit class-of-service interfaces interface-name unit logical-unit-number
user@host# set input-traffic-control-profile profile-name shared-instance instance-name
These statements are explained in Step 7.
- (Optional) Apply the traffic-control profile to an output
interface.
[edit]
user@host# edit class-of-service interfaces interface-name unit logical-unit-number
user@host# set output-traffic-control-profile profile-name shared-instance instance-name
The profile name references the traffic-control profile you
configured in Step 1 through
Step 4. The shared-instance name does not reference a configuration. It can be any text string
you wish to apply to multiple logical interfaces that you want to
share the set of resources configured in the traffic-control profile.
Each logical interface shares a set of scheduling and shaping resources
with other logical interfaces that are on the same physical port and
that have the same shared-instance name applied.
This concept is demonstrated in Example: Configuring Shared Resources on Ethernet IQ2 Interfaces.
Note: You cannot include the output-traffic-control-profile statement in the configuration if either the scheduler-map or shaping-rate statement is included in the logical
interface configuration.
