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C
ONFIGURING
THE
S
WITCH
3-128
• Designated Port – The port priority and number of the port on the
designated bridging device through which this switch must
communicate with the root of the Spanning Tree.
• 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 3-131.
• Oper Edge Port – This parameter is initialized to the setting for
Admin Edge Port in STA Port Configuration on page 3-131 (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 the MSTI regional root (i.e., master 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.
x
R: Root Port
A:Alternate Port
D: Designated Port
B: Backup Port
RR
ADB