Cisco IOS Cookbook, 2nd Edition

AutoQoS

Problem

You want the router to automatically generate the Quality of Service policy map for either VoIP or general IP traffic.

Solution

There are two versions of AutoQoS. The first is specific to VoIP traffic:

Router1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#ip cef
Router1(config)#interface Serial0/0
Router1(config-if)#no ip address
Router1(config-if)#encapsulation frame-relay
Router1(config-if)#exit
Router1(config)#interface Serial0/0.1 point-to-point
Router1(config-subif)#ip address 192.168.55.9 255.255.255.252
Router1(config-subif)#frame-relay interface-dlci 904
Router1(config-fr-dlci)#auto qos voip
%Creating new map-class.
Router1(config-fr-dlci)#exit
Router1(config-subif)#exit
Router1(config)#end
Router1#
*Mar  1 01:32:55.031: %RMON-5-FALLINGTRAP: Falling trap is generated because the
 value of cbQosCMDropBitRate.1169.1171 has fallen below the falling-threshold va
lue 0
Router1#

The other AutoQoS option is called AutoQoS for the Enterprise. This feature is useful for automatically generating policy maps for more general IP traffic. For this feature, the router must first monitor the traffic by using the interface to decide how best to set up the policy maps. To enable this data collection phase, you use the auto discovery qos command:

Router1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#ip cef
Router1(config)#interface Serial0/0
Router1(config-if)#no ip address Router1(config-if)# ...