146 Summit 200 Series Switch Installation and User Guide
Quality of Service (QoS)
Traffic Groupings
Once a QoS profile is modified for bandwidth and priority, you assign traffic a grouping to the profile.
A traffic grouping is a classification of traffic that has one or more attributes in common. Traffic is
typically grouped based on the applications discussed starting on page 144.
Traffic groupings are separated into the following categories for discussion:
• Access list based information (IP source/destination, TCP/UDP port information, and VLANid)
• Destination MAC (MAC QoS groupings)
• Explicit packet class of service information, such as 802.1p or DiffServ (IP TOS)
• Physical/logical configuration (physical source port or VLAN association)
In the event that a given packet matches two or more grouping criteria, there is a predetermined
precedence for which traffic grouping will apply. In general, the more specific traffic grouping takes
precedence. By default, all traffic groupings are placed in the QoS profile Qp1. The supported traffic
groupings are listed in Table 38. The groupings are listed in order of precedence (highest to lowest). The
four types of traffic groupings are described in detail on the following pages.
Access List Based Traffic Groupings
Access list based traffic groupings are based on any combination of the following items:
• IP source or destination address
• TCP/UDP or other layer 4 protocol
• TCP/UDP port information
• MAC source or destination address
• VLANid
Access list based traffic groupings are defined using access lists. Access lists are discussed in detail in
Chapter 9. By supplying a named QoS profile at the end of the access list command syntax, you can
prescribe the bandwidth management and priority handling for that traffic grouping. This level of
packet filtering has no impact on performance.
Table 38: Traffic Groupings by Precedence
IP Information (Access Lists) Grouping
• Access list precedence determined by user configuration
Explicit Packet Class of Service Groupings
• DiffServ (IP TOS)
• 802.1P
Destination Address MAC-Based Groupings
• Permanent
• Dynamic
• Blackhole
Physical/Logical Groupings
• Source port
• VLAN
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