A switch running ESRP (Extreme Standby Router Protocol) should not simultaneously participate in STP (Spanning Tree Protocol) for the same VLAN (Virtual LAN)(s). Other switches in the VLAN being protected by ESRP may run STP; the switch running ESRP forwards, but does not filter, STP BPDUs. Therefore, you can combine ESRP and STP on a network and a VLAN, but you must do so on separate devices. You should be careful to maintain ESRP connectivity between ESRP master and slave switches when you design a network that uses ESRP and STP.
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