D-Link DWS-3000 manual Configuring DiffServ VoIP Support Example

Wired Configuration Guide

Configuring DiffServ VoIP Support Example

Enter Global Config mode. Set queue 5 on all ports to use strict priority mode. This queue shall be used for all VoIP packets. Activate DiffServ for the switch.

config

cos-queue strict 5 diffserv

Create a DiffServ classifier named 'class_voip' and define a single match criterion to detect UDP packets. The class type “match-all” indicates that all match criteria defined for the class must be satisfied in order for a packet to be considered a match.

class-map match-all class_voip match protocol udp

exit

Create a second DiffServ classifier named 'class_ef' and define a single match criterion to detect a DiffServ code point (DSCP) of 'EF' (expedited forwarding). This handles incoming traffic that was previously marked as expedited elsewhere in the network.

class-map match-all class_ef match ip dscp ef

exit

Create a DiffServ policy for inbound traffic named 'pol_voip', then add the previously created classes 'class_ef' and 'class_voip' as instances within this policy.

This policy handles incoming packets already marked with a DSCP value of 'EF' (per 'class_ef' definition), or marks UDP packets per the 'class_voip' definition) with a DSCP value of 'EF'. In each case, the matching packets are assigned internally to use queue 5 of the egress port to which they are forwarded.

policy-map pol_voip in class class_ef

assign-queue 5 exit

class class_voip mark ip-dscp ef assign-queue 5

exit exit

Attach the defined policy to an inbound service interface.

interface 0/3 service-policy in pol_voip

exit exit

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