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"Primary" is just a symbolic to set a low priority value so switch will be root. However, we've noticed different Cisco platforms don't always use the same value for "primary", so it's safer to use the numeric value.
PS:
Keep in mind, whether using a priority value of 4096, or using "primary", another switch (or switches) could have the same priority value, so actual root will then depend on the rest of the MAC.
