Rewriting, Queueing, User-priority mapping – Brocade Network OS NETCONF Operations Guide v4.1.1 User Manual
Page 454: Configuring the qos trust mode
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Network OS NETCONF Operations Guide
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Rewriting
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Rewriting
Rewriting a frame header field is typically performed by an edge device. Rewriting occurs on frames
as they enter or exit a network because the neighboring device is untrusted, unable to mark the
frame, or is using a different QoS mapping.
The frame rewriting rules set the Ethernet CoS and VLAN ID fields. Egress Ethernet CoS rewriting is
based on the user-priority mapping derived for each frame as described later in the queueing
section.
Queueing
Queue selection begins by mapping an incoming frame to a configured user priority, and then each
user-priority mapping is assigned to one of the switch’s eight unicast traffic class queues or one of
the eight multicast traffic class queues.
User-priority mapping
For a description of user priority mapping default values, refer to the Network OS Administrator’s
Guide.
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, QoS trust mode is not allowed. The CEE map always
puts the interface in the CoS trust mode.
To configure the QoS trust mode, perform the following steps.
1. Issue the
urn:brocade.com:mgmt:brocade-interface namespace.
2. Under the
3. Under the
value to the name of the interface for which you want to configure QoS trust mode.
4. Under the
urn:brocade.com:mgmt:brocade-qos namespace.
5. Under the
mode to CoS “trust”.
6. Issue the
The following example sets the trust mode on interface 22/0/2.