Ceragon FibeAir IP-20 All-Outdoor Series, User Manual

Page: 314 / 825

User Guide for FibeAir® IP-20 All-Outdoor Products, CeraOS 10.5
Page 314 of 825
Ceragon Proprietary and Confidential
2 Select the interface you want to configure and click Edit . The Logical Interfaces
- Edit page opens ( Figure 222 ).
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 .
7.4 Configuring Marking
This section includes:
• Marking Overview
• Enabling Marking
• Modifying the 802.1Q Marking Table
•
Modifying the 802.1AD Marking Table
7.4.1 Marking Overview
When enabled, IP-20 '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.
Regular marking is only performed when:
• The outer frame is S-VLAN, and S-VLAN CoS preservation is disabled, or
• The outer frame is C-VLAN, and C-VLAN CoS preservation is disabled.
If marking and CoS preservation for the relevant outer VLAN are both disabled,
special marking is applied. Special marking means that marking is performed, but
only according to the values defined for Green frames in the 802.1Q and 802.1AD
marking tables.
When marking is performed, the C-VLAN or S-VLAN 802.1p UP bits are re-marked
according to the calculated CoS and color, and the mapping table for C-VLAN or S-
VLAN.
7.4.2 Enabling Marking
Marking is enabled and disabled on the service point level. See Ethernet Service
Points – Egress Attributes .