1. Implementing Quality of Service (QoS)
Link Efficiency Mechanisms

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Module 9
AutoQoS
AutoQoS for Enterprise
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Overview
“Single Command” approach to the complex QoS configurations
Similar to the Auto Secure feature
Even if you feel confident in your abilities to configure QoS, you could consider this to save time (you can always tune the automatic configurations)
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4. Requirements for Usage
No service policy can already be attached to the interface
show policy-map interface
If SNMP trap information is desired, you must configure the SNMP server information
Interfaces supported:
Serial (PPP or HDLC)
Frame Relay P2P subinterfaces
ATM P2P subinterfaces (BW < 768K)
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5. Requirements for Usage
An IP address must be assigned to the interface
Slow speed Serial – must be both ends of link
The bandwidth command should be assigned to the interface; if you change it later, Auto QoS will not dynamically adjust
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6. Requirements for Usage
Certain configurations, like on slow speed Frame interfaces, the feature must be configured on both sides of the link
For Frame configs, no existing map class can be assigned to the DLCI
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7. Requirements for Usage
For Frame, fragmentation is using a delay of 10 ms and a min. fragment size of 60 bytes
However, with G.711 on low-speed links, the fragment size could be smaller than the G.711 VoIP packet
To solve choose one of the following:
Change the fragment size to the required value
Change the size of the G.711 VoIP packet to a smaller value
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8. Requirements for Usage
Cisco Express Forwarding must be configured on the interface
For an ATM PVC, configure VBR or CBR
For signaling protocols, Auto QoS is built to identify:
H.323
H.225 (Unicast only)
Session Initiation Protocol (SIP)
“Skinny” gateway protocol
Media Gateway Control Protocol (MGCP)
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9. AutoQoS for Enterprise
Auto QoS – not just for VoIP anymore!
Two phases
The Discovery Phase - NBAR-based protocol discovery detects applications and performs statistical analysis
Installation Phase – generates the configurations based on the above data
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