Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 514)

When Auto QoS is enabled, the modified CEE map will be similar to the following:
switch# show cee maps
CEE Map 'default'
Precedence: 1
Remap Fabric-Priority to Priority 0
Remap Lossless-Priority to Priority 0
Priority Group Table
1: Weight 40, PFC Enabled, BW% 40
2: Weight 40, PFC Disabled, BW% 40
3: Weight 20, PFC Disabled, BW% 20
15.0: PFC Disabled
15.1: PFC Disabled
15.2: PFC Disabled
15.3: PFC Disabled
15.4: PFC Disabled
15.5: PFC Disabled
15.6: PFC Disabled
15.7: PFC Disabled
Priority Table
CoS: 0 1 2 3 4 5 6 7
-----------------------------------------------
PGID: 2 2 3 1 2 2 2 15.0
In the example above a PGID with an ID of “3” is defined with a bandwidth allocation of 20 which is
then mapped to a user-configured CoS value. If the CoS value is not configured, the PGID value is
mapped to the default QoS CoS value (2) in the priority table. This shows that when this CEE map is
applied to an interface, the CoS will be allotted 20% of the overall bandwidth.
Enabling Auto QoS for NAS
Auto QoS (Quality of Service) for NAS creates a minimum bandwidth guarantee for Network Attached
Storage traffic. Auto QoS for NAS is disabled by default; you must enable Auto QoS to allow tagged
NAS packets to have the correct service levels.
All steps must be performed in route-map configuration mode.
The cee-map priority group and priority-map settings must be their default values.
Enabling Auto QoS for NAS:
• Changes the CoS value of tagged NAS packets to 2
• Reduces the weight of PGID 2 from 60 to 40
• Creates a new PGID 3 with a weight of 20
• Modifies the priority table to include PGID 3 for the user-configured NAS CoS, or the default NAS
CoS if the CoS has not been otherwise modified
Use the following procedure to enable Auto QoS for NAS traffic.
1. Enable Auto QoS for all NAS traffic by entering nas auto-qos.
switch(config)# nas auto-qos
2. Set the Class of Service for all NAS traffic by entering: set cos cos_value.
The CoS value affects how Auto QoS operated by specifying the User-Priority field value and traffic-
class value in the VLAN packet header. If you do not specify a CoS value, the NAS CoS value is set
to the default of 2.
This example sets the CoS value to 3:
switch(config)# set cos 3
3. Set the DSCP value for all NAS traffic by entering set dscp dscp_value.
Enabling Auto QoS for NAS
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