Configuring DSCP to CoS Mapping
NetVisor OS supports creating hardware maps that associate Differentiated Services Code Point (DSCP) values in ingress in the received IP headers to Class of Service (CoS) priorities. This functionality also helps in prioritizing traffic based on DSCP markings by using the appropriate egress CoS-based queues to forward traffic out.
A DSCP map can be created, deleted and modified with the following commands:
CLI (network-admin@switch) > dscp-map-create
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dscp-map-create |
Create a DSCP priority mapping table with default DSCP to priority mappings. |
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name name-string |
Create a name for the DSCP map. |
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scope local|fabric |
Specifies the scope for DSCP map. |
CLI (network-admin@Spine1) > dscp-map-delete
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dscp-map-delete |
Delete a DSCP priority mapping table. |
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name name-string |
Name for the DSCP map. |
CLI (network-admin@switch) > dscp-map-pri-map-modify
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dscp-map-pri-map-modify |
Update priority mappings in tables. |
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dscp-map selector: |
|
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name name-string |
Specify the name for the DSCP map to modify. |
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the following pri-map arguments: |
|
|
pri number |
Specify a CoS priority from 0 to 7. |
|
dsmap number-list |
Specify a DSCP value(s) as a single value, comma separated list, or a number range. |
To show the list of DSCP maps, you can use the command:
CLI (network-admin@switch) > dscp-map-show
|
dscp-map-show |
Display a DSCP priority mapping table. |
|
name name-string |
Display the name of the DSCP map. |
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scope local|fabric |
The scope for DSCP map. |
For example:
CLI (network-admin@switch) > dscp-map-create name dscp-map1 scope fabric
CLI (network-admin@switch) > dscp-map-show name dscp-map1
name scope
--------- ------
dscp-map1 fabric
The output of the command is empty if no maps have been created.
To show the associations in a DSCP map, you can use the command:
CLI (network-admin@switch) > dscp-map-pri-map-show
|
dscp-map-pri-map-show |
Display priority mappings in tables. |
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dscp-map selector: |
|
|
name name-string |
Display the name of the DSCP map |
|
the following pri-map arguments: |
|
|
pri number |
Display a CoS priority from 0 to 7. |
|
dsmap number-list |
Display a DSCP value(s) as a single value, comma separated list, or a number range. |
The default values are listed in the following dscp-map-pri-map-show output:
CLI (network-admin@switch) > dscp-map-create name dscp-map1 scope fabric
CLI (network-admin@switch) > dscp-map-pri-map-show name dscp-map1
switch name pri dsmap
------ ---- --- -----------
switch ds2 0 none
switch ds2 1 8,10,12,14
switch ds2 2 16,18,20,22
switch ds2 3 24,26,28,30
switch ds2 4 32,34,36,38
switch ds2 5 40
switch ds2 6 48
switch ds2 7 56
Furthermore, the port-config-modify command has a parameter, dscp-map map-name|none, to apply a DSCP map to a port. (Using the option none removes the DSCP map previously configured on the port.)
For example:
CLI (network-admin@switch) > port-config-modify port 17,21 dscp-map dscp-map1
CLI (network-admin@switch) > port-config-show port 17,21 format switch,intf,dscp-map,
switch intf dscp-map
------- ---- ---------
switch 17 dscp-map1
switch 21 dscp-map1
To modify a DSCP map that is in use, you can change its associations like so:
CLI (network-admin@switch) > dscp-map-pri-map-modify name dscp-map1 pri 5 dsmap 32
CLI (network-admin@switch) > dscp-map-pri-map-show
name pri dsmap
--------- --- -----------
dscp-map1 0 40
dscp-map1 1 8,10,12,14
dscp-map1 2 16,18,20,22
dscp-map1 3 24,26,28,30
dscp-map1 4 34,36,38
dscp-map1 5 32
dscp-map1 6 48
dscp-map1 7 56
You can delete a DSCP map from a port like so:
CLI (network-admin@switch) > port-config-modify port 17,21 dscp-map none