1-20
z The port automatically determines the format (legacy or dot1s) of received MSTP packets and then
determines the format of the packets to be sent accordingly, thus communicating with the peer
devices.
z If the format of the received packets changes repeatedly, MSTP will shut down the corresponding
port to prevent network storm. A port shut down in this way can only be brought up by the network
administrator.
When a port operates in the legacy mode:
z The port recognizes and sends MSTP packets in legacy format. In this case, the port can only
communicate with the peer through packets in legacy format.
z If packets in dot1s format are received, the port turns to discarding state to prevent network storm.
When a port operates in the 802.1s mode:
z The port recognizes and sends MSTP packets in dot1s format. In this case, the port can only
communicate with the peer through packets in dot1s format.
z If packets in legacy format are received, the port turns to discarding state to prevent network storm.
Configuration procedure
Follow these steps to configure how a port recognizes and sends MSTP packets (in system view):
To do... Use the command... Remarks
Enter system view
system-view
—
Configure how a port
recognizes and sends
MSTP packets
stp interface interface-type
interface-number
compliance { auto | dot1s |
legacy }
Required
By default, a port recognizes and sends
MSTP packets in the automatic mode.
That is, it determines the format of
packets to be sent according to the
format of the packets received.
Follow these steps to configure how a port recognizes and sends MSTP packets (in Ethernet port view):
To do... Use the command... Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure how a port
recognizes and sends
MSTP packets
stp compliance { auto |
dot1s | legacy }
Required
By default, a port recognizes and sends
MSTP packets in the automatic mode.
That is, it determines the format of
packets to be sent according to the
format of the packets received.
Configuration example
# Configure GigabitEthernet 1/0/1 to recognize and send packets in dot1s format.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp compliance dot1s
# Restore the default mode for GigabitEthernet 1/0/1 to recognize/send MSTP packets.
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