ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 13 Spanning Tree Protocol
GS1920v2 Series User’s Guide
144
13.7 Multiple Ra pid Spa nning Tre e Pro to c o l Sta tus
Click
Adva nc e d Applic a tio n
>
Spa nning Tre e Pro to c o l
in the navigation panel to display the status
screen as shown next. See Section 13.1 on page 135 for more information on MRSTP.
Note: This screen is only available after you activate MRSTP on the Switch.
Forwarding Delay This is the maximum time (in seconds) the Switch will wait before changing states. This delay is
required because every switch must receive information about topology changes before it
starts to forward frames. In addition, each port needs time to listen for conflicting information
that would make it return to a blocking state; otherwise, temporary data loops might result.
The allowed range is 4 to 30 seconds.
As a general rule:
Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Port This field displays the port number.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to set
the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Active Select this check box to activate STP on this port.
Edge Select this check box to configure a port as an edge port when it is directly attached to a
computer. An edge port changes its initial STP port state from blocking state to forwarding
state immediately without going through listening and learning states right after the port is
configured as an edge port or when its link status changes.
Note: An edge port becomes a non-edge port as soon as it receives a Bridge
Protocol Data Unit (BPDU).
Priority Configure the priority for each port here.
Priority decides which port should be disabled when more than one port forms a loop in a
switch. Ports with a higher priority numeric value are disabled first. The allowed range is
between 0 and 255 and the default value is 128.
Path Cost Path cost is the cost of transmitting a frame on to a LAN through that port. It is recommended
to assign this value according to the speed of the bridge. The slower the media, the higher the
cost - see
Table 48 on page 136 for more information.
Tree Select which STP tree configuration this port should participate in.
Apply Click
Apply
to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the
Sa ve
link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click
C a nc e l
to begin configuring this screen afresh.
Table 53 Advanced Application > Spanning Tree Protocol > MRSTP (continued)
LABEL DESC RIPTIO N