Supermicro SSE-F3548S/SSE-F3548SR Configuration User’s Guide
167
configuration.
Changing the spanning tree mode will shut down the spanning tree currently running and
restart it in the new mode given.
6.8
Spanning Tree Compatibility
MSTP is backward compatible with RSTP and STP. Similarly, RSTP is backward compatible with STP.
When an MSTP operating switch detects an RSTP operating switch in any port, the MSTP switch will
downgrade to RSTP operating mode on that port.
Similarly, when an MSTP or RSTP operating switch detects an STP operating switch in any port, the switch
will downgrade to STP operating mode on that port.
Users can force the switch to operate in any particular compatibility mode. In user configured STP
compatible mode, a switch will transmit and receive only STP BPDUs and will drop any received RSTP and
MSTP BPDUS.
In MSTP mode the default compatibility is MSTP and in RSTP mode the default compatibility is RSTP.
Follow the steps below to configure the spanning tree compatibility.
Step Command
Description
Step 1 configure terminal
Enters the configuration mode
Step 2 To force the spanning tree compatibility as STP
spanning-tree compatibility stp
To force the spanning tree compatibility as RSTP
spanning-tree compatibility rst
To force the spanning tree compatibility as MSTP
spanning-tree compatibility mst
Configures the spanning tree
compatibility.
Step 3 end
Exits the configuration mode.
Step 4 show spanning-tree
Displays the spanning tree mode
information.
Step 5 write startup-config
Optional step – saves this spanning tree
configuration to be part of startup
configuration.
The “no spanning-tree compatibility” command resets the spanning tree compatibility mode
to the default value.