SMC Networks SMC6724L3 Management Manual page 144

C
ONFIGURING THE
• Designated Cost – The cost for a packet to travel from this port to the
root in the current Spanning Tree configuration. The slower the media,
the higher the cost.
• Designated Bridge – The bridge priority and MAC address of the
device through which this port must communicate to reach the root of
the Spanning Tree.
• Designated Port – The port priority and number of the port through
which this switch, acting as a designated bridge, communicates with the
attached LAN or host device.
• Oper Link Type – The operational point-to-point status of the LAN
segment attached to this interface. This parameter is determined by
manual configuration or by auto-detection, as described for Admin Link
Type in STA Port Configuration on page 3-99.
• Oper Edge Port – This parameter is initialized to the setting for Admin
Edge Port in STA Port Configuration on page 3-99 (i.e., true or false), but
will be set to false if a BPDU is received, indicating that another bridge is
attached to this port.
• Port Role – Roles are assigned according to whether the port is part of
the active topology connecting the bridge to the root bridge (i.e., root
port), connecting a LAN through the bridge to the root bridge (i.e.,
designated port); or is an alternate or backup port that may provide
connectivity if other 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.
3-96
S
WITCH
A
R
x
R: Root Port
A: Alternate Port
D: Designated Port
B: Backup Port
R
D B