To prevent the surprises outlined in the previous section, you should always do two things:
• Set a Root Bridge in a determined fashion.
• Set a secondary Root Bridge in case of primary Root Bridge failure.
As the common reference point, the Root Bridge (and the secondary) should be placed near the center of the network. For example, a switch in the Distribution layer would make a better Root Bridge choice than one in the Access layer because more traffic is expected to pass through the Distribution layer devices. In a flat switched network (no Layer 3 devices), a switch near a server farm would be a more efficient Root Bridge than switches elsewhere. Most traffic will be destined to and from the server farm and will benefit from a predetermined, direct path.
To configure a Catalyst switch to become the Root Bridge, use the commands described in the sections that follow.
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