Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
91
20. SPB Configuration
On the ERS 4800, ERS 8800, and VSP 7000, it is recommended to change the Spanning Tree mode to
MSTP. By default, the VSP 4000, VSP 7200, VSP 8000, VSP 9000, and ERS 5900 support MSTP. This
helps when using tools such as VLAN Manager in COM where the VLAN provisioned is broken down by
Spanning Tree instance. To change the Spanning Tree mode to MSTP, please enter the following
command:
ERS 8800
8800:5(config)#boot config flags spanning-tree-mode mstp
VSP 7000 & ERS 4800
7024XLS(config)#spanning-tree mode mst
Changing the Spanning Tree mode flag from default to MSTP on the ERS 8800 will result in a
loss of configuration following the necessary reboot to activate the MSTP flag. This is because
the syntax of certain commands in config.cfg (vlan creation & Spanning Tree port settings)
changes in the two modes. It is therefore necessary to do a manual conversion of the config.cfg
file (for example in a text editor using find & replace) in order to re-load the existing configuration
file in MSTP mode.