Chapter 7: Quality of Service (QoS)
Configuring Marking
phn-3963_004v000
Page 7-52
Configuring the Ingress and Egress Byte Compensation
You can define the ingress and egress byte compensation value per logical interface. The policer
attached to the interface uses these values to compensate for Layer 1 non-effective traffic bytes.
To define the ingress byte compensation value for a logical interface:
1.
Select Ethernet > Interfaces > Logical Interfaces. The Logical Interfaces page opens (
2.
Select the interface you want to configure and click Edit. The Logical Interfaces - Edit page
opens (
3.
In the Ingress byte compensation field, enter the ingress byte compensation value, in bytes.
Permitted values are 0 to 32 bytes. The default value is 20 bytes.
4.
In the Egress byte compensation field, enter the egress byte compensation value, in bytes.
Permitted values are 0 to 32 bytes. The default value is 0 bytes. Only even values are
permitted.
5.
Click Apply, then Close.
Configuring Marking
This section includes:
Modifying the 802.1Q Marking Table
Modifying the 802.1AD Marking Table
Marking Overview
When enabled, PTP 820's marking mechanism modifies each frame’s 802.1p UP bit and CFI/DEI
bits according to the classifier decision. The CFI/DEI (color) field is modified according to the
classifier and policer decision. The color is first determined by a classifier and may be later
overwritten by a policer. Green color is represented by a CFI/DEI value of 0, and Yellow color is
represented by a CFI/DEI value of 1. Marking is performed on egress frames that are VLAN-tagged.
The marking is performed according to global mapping tables that describe the 802.1p UP bits and
the CFI bits (for C-VLAN tags) or DEI bits (for S VLAN tags). The marking bit in the service point
egress attributes determines whether the frame is marked as green or according to the calculated
color.
Note
The calculated color is sent to the queue manager regardless of whether the marking
bit is set.