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Users Manual of XGS-6350-24X4C
Configuring secondary root
Configuring bridge priority
Configuring time parameters of STP
Configuring network diameter
Configuring maximum hop count
Configuring port priority
Configuring path cost for port
Configuring port connection type
Activating MST-compatible mode
19.2.2.1 Activating MST-Compatible Mode
The MSTP protocol that our switches support is based on IEEE 802.1s. In order to be compatible with other
MSTPs, especially MSTP that the Cisco switches support, the MSTP protocol can work in MST-compatible
mode. Switches running in MSTP-compatible mode can identify the message structure of other MSTPs,
check the contained MST regional identifier and establish the MST region.
The MST-compatible mode and the STP-compatible mode are based on MSTP protocol conversion
mechanism. If one port of the switch receives BPDU in compatible mode, the port automatically changes to
the mode and sends BPDU in compatible mode. To resume the port to standard MST mode, you can run
spanning-tree mstp migration-check.
In global configuration mode, run the following commands to activate or disable the MST-compatible mode:
Command Purpose
spanning-tree mstp mst-compatible Activates the MST-compatible mode for the switch.
no spanning-tree mstp mst-compatible Disables the MST-compatible mode for the switch.
The main function of the compatible mode is to create the MST area for switches
and other MSTP-running switches. In actual networking, make sure that the switch
has the same configuration name and the same edit number. It is recommended to
configure switches running other MSTP protocols to the CIST root, ensuring that the
switch enters the compatible mode by receiving message.
If the MST-compatible mode is not activated, the switch will not resolve the whole
BPDU-compatible content and take the content as the common RSTP BPDU. In
this way, the switch cannot be in the same area with the MST-compatible switch
that it connects.
A port in compatible mode cannot automatically resumes to send standard MST
BPDU even if the compatible mode is shut down in global configuration mode. In
this case, run migration-check.
Restart the protocol conversion check.
Check the MSTP message.