Configuring Differentiated Services 1311
The following commands show how to configure the DiffServ example
depicted in Figure 40-18.
1
Set queue 6 on all ports to use strict priority mode. This queue shall be
used for all VoIP packets. Activate DiffServ for the switch.
console#config
console(config)#cos-queue strict 6
console(config)#diffserv
2
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.
console(config)#class-map match-all class_voip
console(config-classmap)#match protocol udp
console(config-classmap)#exit
3
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.
console(config)#class-map match-all class_ef
console(config-classmap)#match ip dscp ef
console(config-classmap)#exit
4
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 6 of the egress port to which
they are forwarded.
console(config)#policy-map pol_voip in
console(config-policy-map)#class class_ef
console(config-policy-classmap)#assign-queue 6
console(config-policy-classmap)#exit
console(config-policy-map)#class class_voip
console(config-policy-classmap)#mark ip-dscp ef
console(config-policy-classmap)#assign-queue 6
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