Gigabit Ethernet Switch Management Guide

W EB I NTERFACE
3-25
Parameter Description
Port Status Displays the current state of this port within the spanning
tree:
No Link There is no valid link on the port.
Disabled Port has been disabled by the user or has failed
diagnostics.
Blocked Port receives STA configuration messages, but
does not forward packets.
Listening Port will leave blocking state due to topology
change, starts transmitting configuration
messages, but does not yet forward packets.
Learning Has transmitted configuration messages for an
interval set by the Forward Delay parameter
without receiving contradictory information.
Port address table is cleared, and the port begins
learning addresses.
ForwardingThe port forwards packets, and continues
learning addresses.
The rules defining port status are:
• A port on a network segment with no other
STA-compliant bridging device is always forwarding.
• If two ports of a switch 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 is blocked.
• All ports are blocked when the switch is booted, then
some of them change state to listening, to learning, and
then to forwarding.
Forward
Transitions
The number of times the port has changed to a 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 priority and MAC address of the device through which
this port must communicate to reach the root of the
spanning tree.