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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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