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How to Prioritize traffic based on DSCP marking, on SecureStacks

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TitleHow to Prioritize traffic based on DSCP marking, on SecureStacks
Objective
How-to-Prioritize-traffic-based-on-DSCP-marking-on-SecureStacks
  • Policy
  • VoIP
  • DSCP
  • CoS
  • Goals
  • Prioritize incoming traffic based on DSCP marking

 
Environment
  • SecureStack C3
  • SecureStack C2
  • SecureStack B3
  • SecureStack B2

 
Procedure
This SecureStack policy configuration will, for all ports, prioritize incoming frames - VLAN-tagged or not - which have DSCP value 46 or 48.
Note1: In the applied network, those values are used by the routers to identify Voice over IP traffic. This will not be true of all networks.
Note2: SecureStack B3 and B2 units will require a Policy License before this configuration may be applied to them.

Solution
set policy profile 1 name VoIP
set policy port ..* 1
set policy rule 1 iptos 176 mask 6 cos 6
set policy rule 1 iptos 184 mask 6 cos 6
By default the outgoing prioritized (priority 6) frames will hit transmit queue#5, while non-prioritized (priority 0) traffic will hit transmit queue#1.
Queue#1 by default receives no service if anything is waiting in queue#5 ('show port txq').
If outgoing frames are VLAN-tagged, the tag of affected frames will carry a Priority of 6.
The specific rules you use will depend upon which bits of the TOS byte you wish to examine:
If you want DSCP values 44 and 46 and don’t care about the remaining two TOS bits:
set policy rule 1 iptos 176 mask 6 cos 6 [= TOS bits 101100xx]
set policy rule 1 iptos 184 mask 6 cos 6 [= TOS bits 101110xx]
If you want DSCP values 44 and 46 and want to ensure that the remaining two TOS bits are zero:
set policy rule 1 iptos 176 mask 8 cos 6 [= TOS bits 10110000]
set policy rule 1 iptos 184 mask 8 cos 6 [= TOS bits 10111000]
If you want TOS values 44 and 46:
set policy rule 1 iptos 46 mask 8 cos 6 [= TOS bits 00101100]
set policy rule 1 iptos 48 mask 8 cos 6 [= TOS bits 00101110]
Please contact Extreme Networks Technical Services for further assistance, as necessary.

 
Additional notes

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