Configure Ethernet interfaces
Digi TransPort User Guide 173
Port status
To view the status of RSTP/STP on a router’s Ethernet ports, the following commands can be
used.
stp show
Port 0, Designated, Forwarding ctrl2:0x6
Port 1, Backup, Discarding ctrl2:0x1
Port 2, Backup, Discarding ctrl2:0x1
Port 3, Disabled, Discarding ctrl2:0x1
The port roles are:
The STP port states are:
Role Description
Disabled There is nothing physically connected to this Ethernet port.
Root A forwarding port that has been elected for the spanning-tree
topology, towards the root bridge.
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.
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 it does learn 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.
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