3Com 4007, Implementation Manual, Page: 199 / 684

10
C
LASS OF
S
ERVICE
(C
O
S)
The IEEE 802.1D Media Access Control (MAC) Bridges standard has been
amended in recent years to include various supplements. One such
supplement standard is
IEEE 802.1p: Traffic Class Expediting and Dynamic
Multicast Filtering . This chapter describes the traffic prioritization portion
of this standard and how it is implemented in Switch 4007 Layer 2
Switching Modules. This chapter covers these topics:
■
Overview
■
Key Concepts
■
CoS in Your System
■
CoS Architecture
■
Configuring Priority Levels
■
Configuring a Rate Limit on Queue 1
■
Handling Tagged and Untagged Packets
■
Standards, Protocols, and Related Reading
You can administer Class of Service (CoS) commands from the
bridge cos
menu of the Administration Console. (See the
Switch 4007 Command Reference Guide .) You can use the
Administration Console after you log in to the Enterprise Management
Engine and connect to a module slot.
The management interfaces display “
cb9000
” and refer to the
Management Module as the Enterprise Management Engine (EME)
because the heritage of the Switch 4007 is the CoreBuilder
® 9000 switch.
The Class of Service (CoS) options that are described in this chapter are
available on Switch 4007 Layer 2 Switching Modules. For a similar but
more extensive array of options on Multilayer Switching Modules, see the
Quality of Service (QoS) information in Chapter 22.