Dell PowerEdge M520 Dell Converged Enhanced Ethernet Administrator's Guide - Page 113

Configuring the QoS trust mode, TABLE 16

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10 Queueing Table 16 presents the Layer 2 QoS untrusted user priority generation table. TABLE 16 Default priority value of untrusted interfaces Incoming CoS User Priority 0 port (default 0) 1 port (default 0) 2 port (default 0) 3 port (default 0) 4 port (default 0) 5 port (default 0) 6 port (default 0) 7 port (default 0) 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. TABLE 17 IEEE 802.1Q default priority mapping Incoming CoS User Priority 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 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. Dell Converged Enhanced Ethernet Administrator's Guide 95 53-1002116-01

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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
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7