3com 3031 Instruccion De Instalación

FIFO queue configuration includes:

■

Configure the length of FIFO queue

FIFO is the queue scheduling mechanism for interface by default, and the length 
of the queue can be changed by configuration command. 

CQ

17

Capable of assigning the 
bandwidth-occupying proportion 
according to packets with different 
applications

If packets of certain classes do not exist, 
it can increase the bandwidth for 
existing packets 

Need to be configured with low 
operation speed

WFQ

Configu
rable

Easily configured

Capable of ensuring the 
bandwidth-occupying for data sources 
(e.g. TCP packets sending) used for 
interactive purpose 

Capable of reducing jitter

Capable of reducing the delay for 
interactive application with small data

Capable of assigning different 
bandwidth for traffic with different 
priorities 

When the amount of the traffic 
decreased, it can automatically increase 
the bandwidth for existing traffic.

Operating speed is lower than FIFO 
but faster then PQ and CQ

CBQ

Configu
rable

(0 to 64)

Capable of classifying data according to 
flexible, various rules, providing 
different queue dispatching mechanism 
for the expedited forwarding (EF), 
assured forwarding (AF) and best- 
effort(BE) services.

Capable of providing highly precise 
bandwidth assurance for the AF service 
and ensuring that the queue 
dispatching is performed according to a 
certain weight proportion among 
various AF services. 

Capable of providing absolutely 
preferential queue dispatching for the 
EF service so as to ensure the  real-time 
data delay. In the mean time, it can 
overcome the disadvantage that the PQ 
of low preference will "extinct due to 
too little data flow" since it restricts the 
data flow of high preference.

Capable of providing WFQ dispatching 
for the default data of best-effort 
forwarding.

The system overhead is larger.

Table 1007   Congestion management technologies