Specifications

396 ExtremeWare XOS 10.1 Command Reference Guide
STP Commands
enable stpd auto-bind
enable stpd <stpd_name> auto-bind vlan <vlan_name>
Description
Automatically adds ports to an STPD when they are added to a member VLAN.
Syntax Description
Default
Disabled. After you enable the autobind feature, and you add ports to a member VLAN, those ports
have autobind enabled.
Usage Guidelines
After you have created both the STPD and the VLAN with unique names, the keywords stpd and vlan
are optional.
When you issue this command, any port or list of ports that you add to the carrier VLAN are
automatically added to the STPD with autobind enabled. In addition, any port or list of ports that you
remove from a carrier VLAN are automatically removed from the STPD. This allows the STPD to
increase or decrease its span as ports are added to or removed from a carrier VLAN.
NOTE
Only the ports added to the Carrier VLAN determine the scope of the STPD.
Carrier VLAN. A carrier VLAN defines the scope of the STPD which includes the physical and logical
ports that belong to the STPD and the 802.1Q tag used to transport STP BPDUs. Only one carrier VLAN
can exist in a given STP domain although some of its ports can be outside the control of any STP
domain at the same time.
NOTE
The carrier VLAN’s StpdID must be identical to the VLANid of one of the member VLANs in that STP
domain.
Protected VLAN. Protected VLANs are all other VLANs that are members of the STP domain but do
not define the scope of the STPD. These VLANs “piggyback” on the carrier VLAN. Protected VLANs do
not transmit or receive STP BPDUs, but they are affected by STP state changes and inherit the state of
the carrier VLAN. Protected VLANs can participate in multiple STP domains, but any particular port in
the VLAN can belong to only one STP domain.
Enabling autobind on a protected VLAN does not expand the boundary of the STPD.
stpd_name Specifies an STPD name on the switch.
vlan_name Specifies the name of the carrier VLAN.