Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
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Chapter 2 Campus <strong>QoS</strong> <strong>Design</strong><br />
Version 3.3<br />
Table 2-2 Catalyst 3550 Auto-<strong>QoS</strong> Generated Configuration<br />
Description Automatically Generated Command<br />
The switch automatically enables standard<br />
<strong>QoS</strong> and configures the CoS-to-DSCP<br />
map (maps CoS values in incoming<br />
packets to a DSCP value).<br />
If 10/100 Ethernet ports are present, the<br />
switch automatically configures the buffer<br />
size of the minimum-reserve levels 5, 6, 7,<br />
and 8:<br />
Level 5 can hold 170 packets.<br />
Level 6 can hold 85 packets.<br />
Level 7 can hold 51 packets.<br />
Level 8 can hold 34 packets.<br />
If you entered the auto qos voip trust<br />
command, the switch automatically sets<br />
the ingress classification to trust the CoS<br />
value received in the packet on a<br />
nonrouted port or to trust the DSCP value<br />
received in the packet on a routed port.<br />
If you entered the auto qos voip<br />
cisco-phone command, the switch<br />
automatically enables the trusted<br />
boundary feature which uses the CDP to<br />
detect the presence or absence of a Cisco<br />
IP Phone.<br />
If you entered the auto qos voip<br />
cisco-softphone command, the switch<br />
automatically creates class maps and<br />
policy maps.<br />
After creating the class maps and policy<br />
maps, the switch automatically applies the<br />
policy map called<br />
Auto<strong>QoS</strong>-Police-SoftPhone to an ingress<br />
interface on which auto-<strong>QoS</strong> with the<br />
Cisco SoftPhone feature is enabled.<br />
Catalyst 3550—<strong>QoS</strong> Considerations and <strong>Design</strong><br />
C3550(config)# mls qos<br />
C3550(config)# mls qos map cos-dscp 0 8 16 26 32<br />
46 48 56<br />
C3550(config)# mls qos min-reserve 5 170<br />
C3550(config)# mls qos min-reserve 6 85<br />
C3550(config)# mls qos min-reserve 7 51<br />
C3550(config)# mls qos min-reserve 8 34<br />
C3550(config-if)# mls qos trust cos<br />
C3550(config-if)# mls qos trust dscp<br />
C3550(config-if)# mls qos trust device cisco-phone<br />
C3550(config)# mls qos map policed-dscp 24 26 46<br />
to 0<br />
C3550(config)# class-map match-all<br />
Auto<strong>QoS</strong>-VoIP-RTP-Trust<br />
C3550(config-cmap)# match ip dscp 46<br />
C3550(config)# class-map match-all<br />
Auto<strong>QoS</strong>-VoIP-Control-Trust<br />
C3550(config-cmap)# match ip dscp 24 26<br />
C3550(config)# policy-map Auto<strong>QoS</strong>-Police-SoftPhone<br />
C3550(config-pmap)# class Auto<strong>QoS</strong>-VoIP-RTP-Trust<br />
C3550(config-pmap-c)# set dscp 46<br />
C3550(config-pmap-c)# police 320000 8000<br />
exceed-action policed-dscp-transmit<br />
C3550(config-pmap)# class<br />
Auto<strong>QoS</strong>-VoIP-Control-Trust<br />
C3550(config-pmap-c)# set dscp 24<br />
C3550(config-pmap-c)# police 32000 8000<br />
exceed-action policed-dscp-transmit<br />
C3550(config-if)# service-policy input<br />
Auto<strong>QoS</strong>-Police-SoftPhone<br />
<strong>Enterprise</strong> <strong>QoS</strong> <strong>Solution</strong> <strong>Reference</strong> <strong>Network</strong> <strong>Design</strong> <strong>Guide</strong><br />
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