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C
ONFIGURING
THE
S
WITCH
3-170
set to disabled (i.e., disabled port) if a port has no role within the
spanning tree.
• Trunk Member – Indicates if a port is a member of a trunk.
(STA Port Information only)
These additional parameters are only displayed for the CLI:
• Admin status – Shows if this interface is enabled.
• External path cost – The path cost for the IST. This parameter is
used by the STA 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.)
• Internal path cost – The path cost for the MST. See the preceding
item.
• Priority – Defines the priority used for this port in the Spanning Tree
Algorithm. If the path cost for all ports on a switch is the same, the
port with the highest priority (i.e., lowest value) will be configured as
Alternate port receives more
useful BPDUs from another
bridge and is therefore not
selected as the designated
port.
x
R: Root Port
A:Alternate Port
D: Designated Port
B: Backup Port
RR
ADB
Backup port receives more
useful BPDUs from the same
bridge and is therefore not
selected as the designated
port.
x
RR
ADB