Extreme Networks ExtremeWare XOS Command Reference Manual page 1179

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
—This mode implements PVST+ in compatibility with third-party switches running this
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pvst-plus
version of STP. The STPDs running in this mode have a one-to-one relationship with VLANs and
send and process packets in PVST+ format.
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
NOTE
These encapsulation modes are for STP ports, not for physical ports. When a physical port belongs to multiple
STPDs, it is associated with multiple STP ports. It is possible for the physical port to run in different modes for
different domains for which it belongs.
STPD Identifier. An StpdID is used to identify each STP domain. You assign the StpdID when
configuring the domain. An StpdID must be identical to the VLANid of the carrier VLAN in that STP
domain, and that VLAN cannot belong to another STPD.
MSTP uses two different methods to identify the STPDs that are part of the MSTP network. An instance
ID of 0 identifies the Common and Internal Spanning Tree (CIST). The switch assigns this ID
automatically when you configure the CIST STPD. A multiple spanning tree instance identifier identifies
each STP domain that is part of an MSTP region. You assign the MSTI ID when configuring the STPD
that participates in the MSTP region. In an MSTP region, MSTI IDs only have local significance. You can
reuse MSTI IDs across MSTP regions.
Example
The following command specifies that all ports subsequently added to the STPD STPD1 be in PVST+
encapsulation mode unless otherwise specified or manually changed:
configure stpd stpd1 default-encapsulation pvst-plus
History
This command was available in ExtremeWare XOS 10.1.
Platform Availability
This command is available on all platforms.
ExtremeWare XOS 11.5 Command Reference Guide
configure stpd default-encapsulation
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