User's Manual

User’s Manual of SGS-5240 Series Managed Switch
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 Forwarding – Port forwards packets, and continues learning addresses.
 Priority – Defines the priority used for this port in the Spanning Tree Protocol. If the path cost for all ports on a switch are
the same, the port with the highest priority (i.e., lowest value) will be configured as an active link in the Spanning Tree.
This makes a port with higher priority less likely to be blocked if the Spanning Tree Protocol is detecting network loops.
Where more than one port is assigned the highest priority, the port with lowest numeric identifier will be enabled.
(Default: 128; Range: 0-240, in steps of 16)
 Admin MST Path Cost – This parameter is used by the MSTP to determine the best path between devices. Therefore,
lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media.
(Path cost takes precedence over port priority.) Note that when the Path Cost Method is set to short (page 3-63), the
maximum path cost is 65,535.
By default, the system automatically detects the speed and duplex mode used on each port, and configures the path cost
according to the values shown below. Path cost “0” is used to indicate auto-configuration mode. When the short path cost
method is selected and the default path cost recommended by the IEEE 8021w standard exceeds 65,535, the default is set to
65,535.
The recommended range is listed in Table 12 .
The default path costs are listed in Table 13 .
To display MSTP parameters for a port or group: