Extreme Networks ExtremeWare XOS Command Reference Manual page 960

STP Commands
You might be attempting to add:
Another 802.1D mode STP port to a physical port that already contains an 802.1D mode STP port
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(only one 802.1D encapsulation STP port can be configured on a particular STP port)
A carrier VLAN port to a different STP domain than the carrier VLAN belongs
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A VLAN/port for which the carrier VLAN does not yet belong
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NOTE
This restriction is only enforced in an active STP domain and when you enable STP to ensure you have a legal
STP configuration.
Naming Conventions. If your VLAN has the same name as another component, for example an STPD,
Extreme Networks recommends that you specify the identifying keyword as well as the name. If your
VLAN has a name unique only to that VLAN, the keywords
STP Encapsulation Modes. You can specify the following STP encapsulation modes:
—This mode is reserved for backward compatibility with previous STP versions. BPDUs are
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dot1d
sent untagged in 802.1D mode. Because of this, any given physical interface can have only one STPD
running in 802.1D mode.
—This mode sends BPDUs with an 802.1Q tag having an StpdID in the VLANid field.
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emistp
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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.
These encapsulation modes are for STP ports, not for physical ports. When a physical ports 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.
Example
The following command adds slot 1, port 2 and slot 2, port 3, members of a VLAN named Marketing, to
the STPD named STPD1, and specifies that they be in EMISTP mode:
configure vlan marketing add ports 1:2, 2:3 tagged stpd stpd1 emistp
History
This command was available in ExtremeWare XOS 10.1.
Platform Availability
This command is available on all platforms.
960
—This mode implements PVST+ in compatibility with third-party switches running this
and are optional.
vlan stpd
ExtremeWare XOS 11.3 Command Reference