Extreme Networks ExtremeWare XOS Command Reference Manual page 1205

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
If you see an error similar to the following:
Error: Cannot add VLAN default port 3:5 to STP domain
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
●
(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 encapsulation mode supports the following STPD modes of operation: 802.1D, 802.1w, and
MSTP.
—This mode sends BPDUs with an 802.1Q tag having an StpdID in the VLANid field.
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emistp
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
—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.
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.
MSTP STPDs use only 802.1D BPDU encapsulation mode. The switch prevents you from configuring
EMISTP or PVST+ encapsulation mode for MSTP STPDs.
Automatically Inheriting Ports—MSTP Only. In an MSTP environment, whether you manually or
automatically bind a port to an MSTI in an MSTP region, the switch automatically binds that port to the
CIST. The CIST handles BPDU processing for itself and all of the MSTIs; therefore, the CIST must inherit
ports from the MSTIs in order to transmit and receive BPDUs. You can only delete ports from the CIST
if the port is no longer a member of an MSTI.
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
ExtremeWare XOS 11.5 Command Reference Guide
configure vlan add ports stpd
and are optional.
vlan stpd
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