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Quality of Service: Managing Bandwidth More Effectively
Globally-Configured QoS
Globally-Configured QoS
QoS Feature Default Reference
UDP/TCP Priority Disabled page 6-24
IP-Device Priority Disabled page 6-33
IP Type-of-Service Priority Disabled page 6-41
Layer-3 Protocol Priority Disabled page 6-54
VLAN-ID Priority Disabled page 6-56
Source-Port Priority Disabled page 6-62
Note For more information on how to use global QoS classifiers, see “Global QoS
Restrictions” on page 6-22.
Global QoS Configuration Procedure
To globally configure a QoS policy on the switch, follow these steps:
1. Determine the global QoS policy you want to implement on the switch by
analyzing the types of traffic flowing through your network and identify-
ing one or more traffic types to prioritize. The order of precedence, from
a (highest) to h (lowest), in which global QoS classifiers are applied is as
follows:
a. TCP/UDP applications
b. Device priority—IP source or destination address (Note that destina-
tion has precedence over source. See Table 6-5.)
c. IP precedence bit set (leftmost three bits in the ToS/Traffic Class field
of IP packets)
d. IP differentiated services bit set (leftmost six bits in the ToS/Traffic
Class field of IP packets)
e. Layer-3 protocol
f. VLAN ID (requires at least one tagged VLAN on the network)
g. Source port
h. Incoming 802.1p priority (requires at least one tagged VLAN on the
network)
6-19