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Quality of Service: Managing Bandwidth More Effectively
Globally-Configured QoS
Global Layer-3 Protocol Classifier
Global QoS Classifier Precedence: 4
When a global Layer-3 Protocol classifier is configured as the highest-prece-
dence classifier and the switch receives traffic carrying the specified protocol,
matching packets are assigned the priority configured for the classifier. (For
information on QoS operation when other global QoS classifiers match the
same traffic, see “Globally-Configured Packet Classification” on page 6-12.)
Assigning a Priority for a Global Layer-3 Protocol Classifier
This global QoS packet-marking option assigns an 802.1p priority to outbound
packets having the specified Layer-3 protocol.
Syntax: qos protocol
< ip | ipx | arp | appletalk | sna | netbeui > priority < 0 - 7 >
Configures an 802.1p priority for outbound packets
having the specified protocol. This priority determines
the packet’s queue in the outbound port to which it is
sent. If the packet leaves the switch on a tagged port, it
carries the 802.1p priority with it to the next down-
stream device. You can configure one QoS classifier for
each protocol type. (Default: No-override)
no qos protocol
< ip | ipx | arp | appletalk | sna | netbeui >
Disables use of the specified protocol as a QoS classifier
and resets the protocol priority to No-override.
show qos protocol
Lists the QoS protocol classifiers with their priority
settings.
Example. In this example, you configure the following global Layer-3 proto-
col classifiers:
1. Configure QoS protocol classifiers with IP at 0 (normal), ARP at 5
(medium), and AppleTalk at 7 (high) and display the QoS protocol config-
uration.
2. Disable the QoS IP protocol classifier, downgrade the ARP priority to 4,
and again display the QoS protocol configuration.
Figure 6-21 shows the configuration commands.
6-54