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Dell Converged Enhanced Ethernet Administrator’s Guide 95
53-1002116-01
Queueing
10
Table 16 presents the Layer 2 QoS untrusted user priority generation table.
NOTE
Non-tagged Ethernet frames are interpreted as incoming CoS value of 0 (zero).
You can override the default user-priority mapping by applying explicit user-priority mappings.
When neighboring devices are trusted and able to properly set QoS then Layer 2 QoS trust can be
set to COS and the IEEE 802.1Q default-priority mapping is applied.
Table 17 presents the Layer 2 CoS user priority generation table conforming to 802.1Q default
mapping. You can override this default user priority table per port if you want to change (mutate)
the COS value.
Configuring the QoS trust mode
The QoS trust mode controls user priority mapping of incoming traffic. The Class of Service (CoS)
mode sets the user priority based on the incoming CoS value. If the incoming packet is not priority
tagged, then fallback is to the Interface Default CoS value.
NOTE
When a CEE map is applied on an interface, the qos trust command is not allowed. The CEE map
always puts the interface in the CoS trust mode.
TABLE 16 Default priority value of untrusted interfaces
Incoming CoS User Priority
0 port <user priority> (default 0)
1 port <user priority> (default 0)
2 port <user priority> (default 0)
3 port <user priority> (default 0)
4 port <user priority> (default 0)
5 port <user priority> (default 0)
6 port <user priority> (default 0)
7 port <user priority> (default 0)
TABLE 17 IEEE 802.1Q default priority mapping
Incoming CoS User Priority
00
11
22
33
44
55
66
77