User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 636 of 825
Ceragon Proprietary and Confidential
18.6
Configuring Scheduling (CLI)
This section includes:
•
Overview of Egress Scheduling (CLI)
•
Configuring Queue Priority (CLI)
•
Configuring Interface Priority Profiles (CLI)
•
Attaching a Priority Profile to an Interface (CLI)
•
Configuring Weighted Fair Queuing (WFQ) (CLI)
18.6.1
Overview of Egress Scheduling (CLI)
Egress scheduling is responsible for transmission from the priority queues. IP-20
uses a unique algorithm with a hierarchical scheduling model over the three levels
of the egress path that enables compliance with SLA requirements.
The scheduler scans all the queues over all the service bundles, per interface, and
determines which queue is ready to transmit. If more than one queue is ready to
transmit, the scheduler determines which queue transmits first based on:
•
Queue Priority
–
A queue with higher priority is served before lower-priority
queues.
•
Weighted Fair Queuing (WFQ)
–
If two or more queues have the same priority
and are ready to transmit, the scheduler transmits frames from the queues
based on a WFQ algorithm that determines the ratio of frames per queue
based on a predefined weight assigned to each queue.
18.6.2
Configuring Queue Priority (CLI)
A priority profile defines the exact order for serving the eight priority queues in a
single service bundle. When you attach a priority profile to an interface, all the
service bundles under the interface inherit the profile.
The priority mechanism distinguishes between two states of the service bundle:
•
Green State
–
Committed state
•
Yellow State
–
Best effort state
Green State refers to any time when the service bundle rate is below the user-
defined CIR. Yellow State refers to any time when the service bundle is above the
user-defined CIR but below the PIR.
You can define up to four Green priority profiles, from 4 (highest) to 1 (lowest). An
additional four Yellow priority profiles are defined automatically and cannot be
changed or edited.
The following table provides a sample of an interface priority profile. This profile is
also used as the default interface priority profile.
