ZyXEL Communications IES-1248 VDSL-SWITCH User Manual page 146

IES-1248 User's Guide
LABEL
Max Age This is the maximum time (in seconds) a switch can wait without receiving a BPDU before
attempting to reconfigure. All switch ports (except for designated ports) should receive BPDUs at
regular intervals. Any port that ages out STP information (provided in the last BPDU) becomes the
designated port for the attached LAN. If it is a root port, a new root port is selected from among the
switch ports attached to the network. The allowed range is 6 to 40 seconds.
Forwarding This is the maximum time (in seconds) a switch will wait before changing states. This delay is
Delay 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:
Port This field identifies the Ethernet port.
Active Select this check box to activate STP on this port.
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 default value is 128.
Path Cost Path cost is the cost of transmitting a frame on to a LAN through that port. It is assigned according
to the speed of the bridge. The slower the media, the higher the cost.
Apply Click Apply to save your changes to the IES-1248's volatile memory. The IES-1248 loses these
changes if it is turned off or loses power, so use the Config Save link on the navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
17-8
Table 17-4 Spanning Tree Protocol: Configuration
2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
DESCRIPTION
Spanning Tree Protocol