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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.
Examples
# 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] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp compliance dot1s
# Restore the default mode in which a port recognizes and send MSTP packets.
[Sysname-Ethernet1/0/1] undo stp compliance
stp config-digest-snooping
Syntax
stp config-digest-snooping
undo stp config-digest-snooping
View
System view, Ethernet port view
Parameters
None
Description
Use the stp config-digest-snooping command to enable the digest snooping feature globally.
Use the undo stp config-digest-snooping command to disable the digest snooping feature globally.
The digest snooping feature is disabled by default.
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