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H3C S3600 Series

H3C S3600 Series
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1-22
By default, a port recognizes and sends MSTP packets in the automatic mode.
A port can be configured to recognize and send MSTP packets in the following modes.
z Automatic mode. Ports in this mode determine the format of the MSTP packets to be sent
according to the format of the received packets.
z Legacy mode. Ports in this mode recognize/send packets in legacy format.
z 802.1s mode. Ports in this mode recognize/send packets in dot1s format.
A port acts as follows according to the format of MSTP packets forwarded by a peer switch or router.
When a port operates in the automatic mode:
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 again by the
network administrator.
When a port operates in the legacy mode:
z The port only 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 only 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.
Example
# Configure Ethernet 1/0/1 to recognize and send MSTP packets in dot1s format.
<Sysname> system-view
Enter system view, return to user view with Ctrl+Z.
[Sysname] stp interface Ethernet1/0/1 compliance dot1s
# Restore the default mode in which a port recognizes and send MSTP packets.
[Sysname] undo stp interface Ethernet1/0/1 compliance
stp interface config-digest-snooping
Syntax
stp interface interface-list config-digest-snooping
undo stp interface interface-list config-digest-snooping
View
System view
Parameters
interface-list: Ethernet port list. You can specify multiple Ethernet ports by providing this argument in the
format of interface-list ={ interface-type interface-number [ to interface-type interface-number ] }

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