Web Management Guide-R01

Table Of Contents
Chapter 9
| Class of Service
Layer 3/4 Priority Settings
– 247 –
To show the DSCP to internal PHB/drop precedence map:
1. Click Traffic, Priority, DSCP to DSCP.
2. Select Show from the Action list.
3. Select a port.
Figure 148: Showing DSCP to DSCP Internal Mapping
Mapping
CoS Priorities to
Internal DSCP Values
Use the Traffic > Priority > CoS to DSCP page to maps CoS/CFI values in incoming
packets to per-hop behavior and drop precedence values for priority processing.
Command Usage
The default mapping of CoS to PHB values is shown in Table 17 on page 248.
Enter up to eight CoS/CFI paired values, per-hop behavior and drop
precedence.
If a packet arrives with a 802.1Q header but it is not an IP packet, then the CoS/
CFI-to-PHB/Drop Precedence mapping table is used to generate priority and
drop precedence values for internal processing. Note that priority tags in the
original packet are not modified by this command.
The internal DSCP consists of three bits for per-hop behavior (PHB) which
determines the queue to which a packet is sent; and two bits for drop
precedence (namely color) which is used to control traffic congestion.
Parameters
These parameters are displayed:
Port – Specifies a port.