Configuring network interfaces Configure Ethernet interfaces
Digi TransPort® Routers User Guide
205
Role Description
Designated A forwarding port for every LAN segment, away from the root bridge.
Alternate An alternate path to the root bridge. This path is different than using the root port.
Backup A backup/redundant path to a segment where another bridge port already connects.
The STP port states are:
State Description
Disabled The port is not functioning and cannot send or receive data.
Listening The port is sending and receiving BPDUs and participates in the election process of
the root bridge. Ethernet frames are discarded.
Learning The port does not yet forward frames, but learns source addresses from frames
received and adds them to the MAC address table.
Forwarding The port receiving and sending data, normal operation. STP still monitors incoming
BPDUs that would indicate it should return to the blocking state to prevent a loop.
Locking A port that would cause a switching loop, no user data is sent or received but it may
go into forwarding mode if the other links in use were to fail and the spanning tree
algorithm determines the port may transition to the forwarding state. BPDU data is
still received in blocking state.
The RSTP port states are:
Role Description
Learning The port does not yet forward frames but it does learn source addresses from
frames received and adds them to the MAC address table. The port processes
BPDUs.
Forwarding The port receiving and sending data, normal operation. STP still monitors incoming
BPDUs that would indicate it should return to the blocking state to prevent a loop.
Discarding A port that would cause a switching loop, no user data is sent or received but it may
go into forwarding mode if the other links in use were to fail and the spanning tree
algorithm determines the port may transition to the forwarding state. BPDU data is
still received in blocking state.
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