Configuring the ECN330-switch
244 1553-KDU 137 365 Uen D 2006-06-16
• If two ports of an ECN330 are connected to the same segment and
there is no other STA device attached to this segment, the port with
the smaller ID forwards packets and the other port is set to
discarding.
• All ports are discarding when the ECN330 is booted, then some of
them change state to learning, and then to forwarding.
• Forward Transitions – The number of times this port has transitioned
from the Learning state to the Forwarding state.
• 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, the MST Instance ID 0 for the
Common Spanning Tree when spanning tree mode is set to MSTP, 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 on the
designated bridging device through which the ECN330-switch must
communicate with the root of the Spanning Tree.
• Oper Path Cost (Operational Path Cost) – The contribution of this port
to the cost of paths towards the spanning tree root which includes this
port.
• Oper Link Type (Operational 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 256.
• Oper Edge Port (Operational Edge Port) – This parameter is initialized
to the setting for Admin Edge Port in STA Port Configuration on
page 247 (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 (root port),
connecting a LAN through the bridge to the root bridge (that is,
designated port), or is the MSTI regional root (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
(disabled port) if a port has no role within the spanning tree.
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