To be compatible with the different iterations of the IEEE 802.1D standard, the 7450 ESS, 7750 SR, and 7950 XRS support several variants of the Spanning Tree protocol:
rstp — Rapid Spanning Tree Protocol (RSTP) compliant with IEEE 802.1D-2004 - default mode.
dot1w — Compliant with IEEE 802.1w.
comp-dot1w — Operation as in RSTP but backwards compatible with IEEE 802.1w (this mode was introduced for interoperability with some MTU types).
mstp — Compliant with the Multiple Spanning Tree Protocol specified in IEEE 802.1Q REV/D5.0-09/2005. This mode of operation is only supported in an M-VPLS.
pmstp — Compliant with the Multiple Spanning Tree Protocol specified in IEEE 802.1Q REV/D3.0-04/2005 but with some changes to make it backwards compatible to 802.1Q 2003 edition and IEEE 802.1w.
See section Spanning Tree Operating Modes for more information about these modes.
CLI Syntax:
config>service>vpls service-id# stp
mode {rstp | comp-dot1w | dot1w | mstp}
The default variant of the Spanning Tree protocol is rstp.