Cisco BR1400 Deployment Manual page 40

Many buildings have professional grounding systems already installed.
Figure 34.
6.6 First time installation / linking the Bridges:
If you have not pre-configured the Bridges, you will find upon startup they will default into a
"Bridge Install & Alignment mode" and the following rules apply:
• The Station role of the bridge is "autoinstall"
• The bridge assumes a non-root bridge role and is able to associate to another root bridge
within 60 seconds after IOS is loaded
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