Netgear GSM7328Sv2 - ProSAFE 24+4 Gigabit Ethernet L3 Managed Stackable Switch 管理员指南

11.   

CoS Queuing 

Class of Service Queuing

This chapter describes Class of Service (CoS) queue mapping, CoS Configuration, and traffic 
shaping features. This chapter provides the following examples:

•     Show classofservice Trust 

•     Set classofservice Trust Mode 

•     Show classofservice IP-Precedence Mapping 

•     Configure Cos-queue Min-bandwidth and Strict Priority Scheduler Mode 

•     Set CoS Trust Mode for an Interface 

•     Configure Traffic Shaping 

Each port has one or more queues for packet transmission. During configuration, you can 
determine the mapping and configuration of these queues. 

Based on the service rate and other criteria you configure, queues provide preference to 
specified packets. If a delay is necessary, the system holds packets until the scheduler 
authorizes transmission. As queues become full, packets are dropped. Packet drop precedence 
indicates the packet’s sensitivity to being dropped during queue congestion. 

Select per interface configuration scheme:

You can configure CoS mapping, queue parameters, and queue management are configurable 
per interface.

Queue management is configurable per interface.

Some hardware implementations allow queue depth management using tail dropping or 
weighted random early discard (WRED).

Some hardware implementations allow queue depth management using tail dropping.

The operation of CoS queuing involves queue mapping and queue configuration.