Dell PowerConnect 7024, Руководство пользователя

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1112
Configuring Differentiated Services
The following commands show how to configure the DiffServ example
depicted in Figure 39-18.
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