Cambium Networks PTP 850E, User Manual

Page: 178 / 560

Chapter 7: Quality of Service (QoS) Configuring Classification
phn-3963_008v000
Page 7-4
Configuring Classification
The hierarchical classifier consists of the following levels:
•
Logical interface-level classification
• Service point-level classification
•
Service level classification
This section explains how to configure classification at the logical interface level.
•
For instructions how to configure classification at the service point level, see 2. Ethernet Service Points –
Ingress Attributes.
• For instructions how to configure classification at the service level, see Adding an Ethernet Service .
This section includes:
• Classification Overview
•
Configuring Ingress Path Classification on a Logical Interface
• Modifying the C-VLAN 802.1Q UP and CFI Bit Classification Table
•
Modifying the S-VLAN 802.1 UP and DEI Bit Classification Table
• Modifying the DSCP Classification Table
•
Modifying the MPLS EXP Bit Classification Table
In addition to the procedures described in this section, you can specify a specific CoS and Color for a specific VLAN
ID. This is the highest classification priority on the logical interface level, and overrides any other classification
criteria at the logical interface level. Classification by VLAN ID can only be configured via CLI. See
Configuring VLAN
Classification and Override (CLI) .
Classification Overview
PTP 850 supports a hierarchical classification mechanism. The classification mechanism examines incoming frames
and determines their CoS and Color. The benefit of hierarchical classification is that it provides the ability to “zoom
in” or “zoom out”, enabling classification at higher or lower levels of the hierarchy. The nature of each traffic
stream defines which level of the hierarchical classifier to apply, or whether to use several levels of the
classification hierarchy in parallel.
Classification takes place on the logical interface level according to the following priorities:
• VLAN ID (CLI-only – see Configuring VLAN Classification and Override (CLI) )
•
802.1p bits
• DSCP bits (only considered if MPLS is not present, regardless of trust setting)
•
MPLS EXP field
• Default interface CoS
PTP 850 performs the classification on each frame ingressing the system via the logical interface. Classification is
performed step by step from the highest priority to the lowest priority classification method. Once a match is
found, the classifier determines the CoS and Color decision for the frame for the logical interface-level.