Information Technology Reference
In-Depth Information
Table 6-8
AutoQoS Syntax Variations
Command
Platform
Description
auto qos voip
trust
Router or
switch
Enables AutoQoS, trusting any existing QoS markings
that enter the interface only if the switch detects a Cisco
IP phone attached through CDP.
auto qos voip
cisco-phone
Switch
Enables AutoQoS, trusting any existing QoS markings
that enter the interface only if the switch detects a Cisco
IP phone attached through CDP.
auto qos voip
cisco-softphone
Switch
Enables AutoQoS, trusting any existing QoS markings
that enter the interface only if the switch detects a Cisco
IP SoftPhone (such as Cisco IP Communicator) attached
through CDP.
Note:
QoS engineers identify what have been called QoS markings in the previous sec-
tion as Class of Service (CoS) and Type of Service (ToS) markings. CoS is a marking that
exists in the Layer 2 header of a frame, which a switch can identify. ToS is a marking that
exists in the Layer 3 header of a packet, which a router can identify. This topic is explored
in depth in the material for the QoS CCNP Voice certification exam.
