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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 42 Configuring Quality of Service
Configuring VSS Auto-QoS
set dscp af21
set cos 2
class AutoQos-4.0-Bulk-Data-Classify
set dscp af11
set cos 1
class AutoQos-4.0-Scavenger-Classify
set dscp cs1
set cos 1
class AutoQos-4.0-Default-Classify
set dscp default
set cos 0
!
The output policy maps are as follows:
policy-map AutoQos-4.0-Output-Policy
class AutoQos-4.0-Scavenger-Queue
bandwidth remaining percent 1
class AutoQos-4.0-Priority-Queue
priority
police cir percent 30 bc 33 ms
class AutoQos-4.0-Control-Mgmt-Queue
bandwidth remaining percent 10
class AutoQos-4.0-Multimedia-Conf-Queue
bandwidth remaining percent 10
class AutoQos-4.0-Multimedia-Stream-Queue
bandwidth remaining percent 10
class AutoQos-4.0-Trans-Data-Queue
bandwidth remaining percent 10
dbl
class AutoQos-4.0-Bulk-Data-Queue
bandwidth remaining percent 4
dbl
class class-default
bandwidth remaining percent 25
dbl
The three policy maps are defined as follows:
• policy-map AutoQos-VoIP-Input-Dscp-Policy
This policy map is applied as an input service policy on an Layer 3 interface (such as an uplink
connection to a neighboring switch) when auto-QoS is configured on the port.
• policy-map AutoQos-VoIP-Input-Cos-Policy
This policy map is applied as an input service policy on an Layer 2 interface that could be either an
uplink connection or a port hooked to a Cisco IP Phone.
• policy-map AutoQos-VoIP-Output-Policy
This policy map is applied as an output policy for any port on which auto-QoS is configured,
establishing policy governing egress traffic on the port based on whether it is voice data or control
traffic.
The purpose of the input policy maps is to identify voice data or control traffic and mark it as such as it
traverses the switch. The output policy map matches the packets on the marking occurring on ingress
and then applies egress parameters such as bandwidth, policing and/or priority queuing.
For switch-to-switch connections, the [no] auto qos voip trust command is used to apply an input and
output service policy on the interface:
service-policy input AutoQos-VoIP-Input-Cos-Policy
OR
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