Owner's Manual

Chapter 18. STP | 533
NETGEAR 8800 User Manual
If you add a protected VLAN or port, that addition inherits the carrier VLAN’s encapsulation
mode unless you specify the encapsulation mode when you execute the
configure stpd add
vlan
or configure vlan add ports stpd commands. If you specify an encapsulation mode
(
dot1d, emistp, or pvst-plus), the STP port mode is changed to match; otherwise, the STP
port inherits either the carrier VLANs encapsulation mode on that port or the STPD’s default
encapsulation mode.
For MSTP, you do not need carrier a VLAN. A CIST controls the connectivity of
interconnecting MSTP regions and sends BPDUs across the regions to communicate region
status. You must use the dot1d encapsulation mode in an MSTP environment. For more
information about MSTP, see the section
Multiple Spanning Tree Protocol on page 557.
To remove ports, use the following command:
configure stpd <stpd_name> delete vlan <vlan_name> ports [all | <port_list>]
If you manually delete a protected VLAN or port, only that VLAN or port is removed. If you
manually delete a carrier VLAN or port, all VLANs on that port (both carrier and protected)
are deleted from that STPD.
To learn more about member VLANs, see Member VLANs on page 527. For more detailed
information about these command line interface (CLI) commands, see the NETGEAR 8800
Chassis Switch CLI Manual.
Automatically Binding Ports
To automatically bind ports to an STPD when the ports are added to a VLAN, use the
following command:
enable stpd <stpd_name> auto-bind vlan <vlan_name>
The autobind feature is disabled on user-created STPDs. The autobind feature is enabled on
the default VLAN that participates in the default STPD S0.
For EMISTP or PVST+, 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 feature allows the STPD to increase or decrease its span as ports are added
to or removed from a carrier VLAN.
Note: The carrier VLAN’s ID must be identical to the ID of the STP
domain.
Enabling autobind on a protected VLAN does not expand the boundary of the STPD. If the
same set of ports are members of the protected VLAN and the carrier VLAN, protected
VLANs are aware of STP state changes. For example, assume you have the following
scenario:
• Carrier VLAN named v1
• v1 contains ports 3:1-3:2