SMC Networks SMC TigerStack III SMC6824M Management Manual page 223

bridges, bridge ports, or LANs fail or are removed. The role is set to
disabled (i.e., disabled port) if a port has no role within the spanning tree.
Alternate port receives more
useful BPDUs from another
bridge and is therefore not
selected as the designated
port.
• Trunk Member
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 an active
link in the Spanning Tree. This makes a port with higher priority less
11. STA Port Information only.
S
PANNING
R
A
x
R
A D
x
11
– Indicates if a port is a member of a trunk.
T A
REE LGORITHM
R
D B
Backup port receives more
useful BPDUs from the same
bridge and is therefore not
selected as the designated
port.
R
B
C
ONFIGURATION
R: Root Port
A: Alternate Port
D: Designated Port
B: Backup Port
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