primary | secondary also lets you set the priority, but the switch decides on a value to
make that switch likely to be the primary root switch (the root) or the secondary root
switch (the switch that becomes root if the primary fails).
■
Port Costs: The interface subcommand spanning-tree [vlan x] cost y lets an engineer
set the switch’s STP/RSTP cost on that port, either for all VLANs or for a specific VLAN
on that port. Changing those costs then changes the root cost for some switches, which
impacts the choice of root ports and designated ports.
That concludes this chapter’s examination of RSTP configuration—now on to Layer 2
EtherChannel!
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