Allied Telesis SwitchBlade x3100 Series Manual page 468

Introduction EPSR and (R)STP Interaction
cost for EPSR ring), but due to the greater magnitude of path cost value utilized for RSTP by default, this
becomes much easier to accomplish through provisioning.
When provisioning an EPSR and RSTP network with shared links, there can be a warning at the CLI about path
costs, this can occur if the user is going from separate EPSR / RSTP networks to one with the shared link, and
when the user enables RSTP on a port that has EPSR configured, the message will appear.
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Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)