Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Trust based classification

OS10 supports classification based on the 802.1p CoS field (L2) or DSCP field (L3).

802.1p CoS trust map:

Trust the 802.1p CoS field to mark with a traffic-class ID and color for the CoS flow. Weighted random early detection (WRED) uses color to define drop-probabilities and thresholds for egress traffic. See Color traffic for more information. By default, 802.1p priority level 0 is assigned traffic class (TC) ID 1 and 802.1p priority level 1 is assigned TC 0. The rest of the 802.1p priority levels (2 through 7) are assigned the respective TC IDs.

User–defined 802.1p CoS trust map

You can override the default mapping by creating a dot1p trust map. All the unspecified dot1p entries map to the default traffic class ID 0.

Configure user–defined 802.1p CoS trust map

1. Create a dot1p trust map.

   OS10(config)# trust dot1p-map example-dot1p-trustmap-name
   OS10(config-tmap-dot1p-map)#

2. Define the set of dot1p values mapped to traffic-class, the qos-group ID.

   OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 0-4
   OS10(config-tmap-dot1p-map)# qos-group 5 dot1p 5-7

3. Verify the map entries.

   OS10# show qos maps type trust-map-dot1p example-dot1p-trustmap-name
   
   DOT1P Priority to Traffic-Class Map : example-dot1p-trustmap-name
   Traffic-Class    DOT1P Priority
   -------------------------------
   3                   0-4
   5                   5-7

4. Apply the map on a specific interface or on system-qos, global level.
   • Interface level

     OS10(conf-if-eth1/1/1)# trust-map dot1p example-dot1p-trustmap-name
     

     NOTE In the interface level, the no version of the command returns the configuration to the system-qos level. If there is no configuration available at the system-qos level, the configuration returns to default mapping.
   • System-qos level

     OS10(config-sys-qos)# trust-map dot1p example-dot1p-trustmap-name

Apply CoS trust map

After you create a trust map, you must apply the trust map at the interface or system-qos level. To apply the trust map on a specific interface or on system-qos (global) level:

• Interface level

  OS10(conf-if-eth1/1/1)# trust-map dot1p example-dot1p-trustmap-name
  

  NOTE In the interface level, the no version of the command returns the configuration to system-qos level. If there is no configuration available at the system-qos level, then the configuration returns to default mapping.
• System-qos level

  OS10(config-sys-qos)# trust-map dot1p example-dot1p-trustmap-name

DSCP trust map:

Assign a predefined and reserved trust classification in the policy map for the DSCP flow. Weighted random early detection (WRED) uses the color assigned to a particular traffic to determine the drop-probability and threshold.

User–defined DCSP trust map

You can override the default mapping by creating a user-defined DSCP trust map. All the unspecified DSCP entries map to the default traffic class ID 0 and color G.

Configure user–defined DSCP trust map

1. Create a DSCP trust map.

   OS10(config)# trust dscp-map example-dscp-trustmap-name 
   OS10(config-tmap-dscp-map)#

2. Define the set of dscp values mapped to traffic-class, the qos-group ID.

   OS10(config-tmap-dscp-map)# qos-group 3 dscp 0-15 
   OS10(config-tmap-dscp-map)# qos-group 5 dscp 16-30

3. Verify the map entries.

   OS10# show qos maps type trust-map-dscp example-dscp-trustmap-name
   
   DSCP Priority to Traffic-Class Map  : example-dscp-trustmap-name
   Traffic-Class    DSCP Priority
   -------------------------------
   3                   0-15
   5                   16-30

4. Apply the map on a specific interface or on system-qos global level.
   • Interface level

     OS10(conf-if-eth1/1/1)# trust-map dscp example-dscp-trustmap-name

   • System-qos level

     OS10(config-sys-qos)# trust-map dscp example-dscp-trustmap-name

Apply DSCP trust map

You must apply the trust map at the interface or system-qos level. To apply the trust map on a specific interface or on system-qos (global) level:

• Interface level

  OS10(conf-if-eth1/1/1)# trust-map dscp example-dscp-trustmap-name

• System-qos level

  OS10(config-sys-qos)# trust-map dscp example-dscp-trustmap-name