Figure 143 s – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
Page 846
796
Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Layer 3/4 Priority Settings
38
•
If the QoS mapping mode is set to DSCP, and a non-IP packet is received, the packet’s CoS and
CFI (Canonical Format Indicator) values are used for priority processing if the packet is tagged.
For an untagged packet, the default port priority (see
) is used for priority processing.
•
If the QoS mapping mode is set to CoS, and the ingress packet type is IPv4, then priority
processing will be based on the CoS and CFI values in the ingress packet.
For an untagged packet, the default port priority (see
) is used for priority processing.
Parameters
These parameters are displayed:
•
Port – Port identifier.
•
Trust Mode
•
CoS – Maps layer 3/4 priorities using Class of Service values. (This is the default setting.)
•
DSCP – Maps layer 3/4 priorities using Differentiated Services Code Point values.
Interface
To configure the trust mode:
1. Click Traffic, Priority, Trust Mode.
2. Select the interface type to display (Port or Trunk).
3. Set the trust mode.
4. Click Apply.
FIGURE 143
Setting the Trust Mode
Mapping Ingress DSCP Values to Internal DSCP Values
Use the Traffic > Priority > DSCP to DSCP page to map DSCP values in incoming packets to per-hop
behavior and drop precedence values for internal priority processing.
The DSCP is six bits wide, allowing coding for up to 64 different forwarding behaviors. The DSCP
replaces the ToS bits, but it retains backward compatibility with the three precedence bits so that
non-DSCP compliant, ToS-enabled devices, will not conflict with the DSCP mapping. Based on
network policies, different kinds of traffic can be marked for different kinds of forwarding.
CLI References
•