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Quality of Service: Managing Bandwidth More Effectively
QoS Operation
Be sure to carefully plan your QoS strategies in advance, identifying the
network traffic that you can globally configure and the traffic on which you
want to execute customized, classifier-based QoS actions.
Globally-Configured QoS
Globally-Configured QoS Feature Default Page
Reference
UDP/TCP Priority Disabled page 6-24
IP-Device Priority Disabled page 6-33
IP Type-of-Service Priority Disabled page 6-41
LAN Protocol Priority Disabled page 6-54
VLAN-ID Priority Disabled page 6-56
Source-Port Priority Disabled page 6-62
DSCP Policy Table Various page 6-88
Queue Configuration 4 or 8 Queues* page 6-95
*Series 3500yl switches use four queues by default.
Series 5400zl switches and the Series 8212zl switch use eight queues by
default.
Globally-configured QoS operation supports the following types of packet
classification and traffic marking on outbound port and VLAN traffic. For
information on how to configure and use global QoS settings, see “Globally-
Configured QoS” on page 6-19.
■ Globally configured packet classification criteria include:
• IPv4 device: source and destination address
• Layer 2 802.1p priority (VLAN header)
• Layer 3 protocol (such as ARP, IP, IPX, RIP)
• Layer 3 IPv4 Type of Service (ToS) byte: IP precedence or DSCP bits
• Layer 3 IPv6 Traffic Class byte: IP precedence or DSCP bits
• Layer 4 UDP/TCP application port
• Source port on the switch
• VLAN ID
■ Traffic marking options are as follows:
• Setting the Layer 2 802.1p priority value in VLAN-tagged and untagged
packet headers
• Setting the Layer 3 Differentiated Services Codepoint (DSCP) bits in
the ToS byte of IPv4 packet headers and Traffic Class byte of IPv6
headers.
6-10