Nortel Networks 1000BASE-ZX Manual Do Utilizador

Chapter 3 Using the console interface

Using the BayStack 420 10/100/1000 Switch

The high speed flow control feature allows you to control traffic and avoid 
congestion on the Gigabit full-duplex link. If the receive port buffer becomes full, 
the BayStack 420 Switch issues a flow-control signal to the device at the other end 
of the link to suspend transmission. When the receive buffer is no longer full, the 
switch issues a signal to resume the transmission. You can choose Symmetric or 
Asymmetric flow control mode.

This mode allows both the GBIC port and its link partner to send flow control 
pause frames to each other.

When a pause frame is received (by either the GBIC port or its link partner), the 
port suspends transmission of frames for a number of slot times specified in the 
control frame or until a pause-release control frame is received. Both devices on 
the link must support this mode when it is selected.

This mode allows the link partner to send flow control pause frames to the GBIC 
port. When a pause frame is received, the receiving port suspends transmission of 
frames for a number of slot times specified in the control frame or until a 
pause-release control frame is received.

In this mode, the GBIC port is disabled from transmitting pause frames to its link 
partner. Use this mode when the GBIC port is connected to a buffered repeater 
device.

The MultiLink Trunk Configuration Menu screen (

) allows you to select 

the appropriate screen to configure up to six MultiLink Trunks (you can group up 
to four switch ports together to form each trunk).

You can configure up to six MultiLink Trunks in each stack, with trunk members 
in either a single unit or distributed between units within the stack configuration 
(distributed trunking).