Display this interface's status on the spanning tree:
Discarding: port receives STP configuration messages, but does
not forward packets.
Learning: port does not forward packets, and starts to learn MAC
address.
Forwarding: port forwards packets, and continues learning
addresses.
Options of protection types enabled on interfaces are:
Root protection: root protection function can protect the root
switch position by maintaining the role of designated port. By
configuring the Root Protection on port, all the port roles in
instances will be kept as designated ports. When the port receives a
higher priority BPDU, the port role will not set as non-designated
port, but turn into the listening state and stop forwarding packets.
If the port has no longer receives higher priority BPDU after a long
time, it will restore to its original normal state.
Loop Protection: on the switch, the status of root ports and other
blocked ports are relying on the continuous BPDUs received from
the upstream switch. The switch will reselect root port when the
BPDU from the upper switch cannot be received because of
network congestion or unidirectional link failure. If the original
root port becomes a designated port and the original blocked port
moves to the forwarding state, it will results in undesirable loops in
switch network. Loop protection function can suppress this kind of
loop. After the loop protection started, if the root port cannot
receive a BPDU from upstream, it will be set in blocked state, and
the blocked ports will remain in blocking state and does not
forward packets to the network to ensure that no loop can be
formed.
TC Protection: the switch will delete MAC address table and ARP
table entry if TC-BPDU is received. The frequent deletion of table
entry for receiving a large amount of TC-BPDU will bring a great
burden to device. TC protection Configuration on interface can
avoid frequent deletion operations, and avoid the transmission of
TC-BPDU.
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