ZyXEL Communications IES-1248-51 Guia do Utilizador descarregar pdf (Página 207)

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Chapter 25 Spanning Tree Protocol

IES-1248-51V User’s Guide

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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 Delay This is the maximum time (in seconds) a 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:

2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)

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-1248-51V’s volatile

memory. The IES-1248-51V 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.

Table 53 Spanning Tree Protocol (continued)

LABEL DESCRIPTION

1 2 ... 202 203 204 205 206 207 208 209 210 211 212 ... 653 654

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