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How To Configure Spanning Tree on EXOS Switch to Connect to EOS Switch Running Default Spanning Tree Protocol or Third Party SwitchConfigured For MST Without Common MST-Digest

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TitleHow To Configure Spanning Tree on EXOS Switch to Connect to EOS Switch Running Default Spanning Tree Protocol or Third Party SwitchConfigured For MST Without Common MST-Digest
Objective
EOS Switches have spanning tree enabled by default and EXOS switches do not, making it important to use care when connecting them together to avoid data loops in the network.

EOS switches are configured with MSTP by default and use their MAC address as part of the configuration  digest. Unless the config digest on two or more switches are configured the same the switches will be in different regions and behave like a Rapid Spanning Tree 802.1W link.  

If you configure an EXOS switch to use Rapid Spanning Tree it will require the configuration of an untagged VLAN to other switches to carry BPDU's.  Avoid having to configure the untagged VLAN by configuring MSTP on the EXOS switch.
 
Environment
  • S-Series
  • K-series
  • Securestack
  • G-Series
  • 7100-Series
  • Summit
  • BlackDiamond
Procedure
Below is an example of how to configure an EXOS switch to connect to an EOS switch running  its default MSTP protocol.

#
##Configure MSTP
#
configure mstp revision 3
#
##S0 Config
#
configure stpd s0 mode mstp cist
enable s0 auto-bind vlan 1-4094
configure s0 ports auto-edge on #<ports>
enable stpd s0

 
Additional notes
Multiple Spanning Tree Protocol (MSTP) is enabled as a factory default in 22.2 firmware.  When you boot up a switch for the first time, you are informed that MSTP is enabled by default.  You can change this
setting if desired.

See also
Understanding MSTP
What is an STP Carrier vlan?

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