Netgear XCM8806 Chassis Hardware Installation Guide - Page 778

NETGEAR 8800 Chassis Switch CLI Manual If you enable autobind and add ports to a member VLAN, those ports are automatically added to the STPD. Usage Guidelines If you create an STPD and a VLAN with unique names, the keywords stpd and vlan are optional. You cannot configure the autobind feature on a network login VLAN. In an EMISTP or PVST+ environment, 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 you add ports to or remove ports from a carrier VLAN. For MSTP, when you issue this command, any port or list of ports that gets automatically added to an MSTI are automatically inherited by the CIST. In addition, any port or list of ports that you remove from an MSTI protected VLAN are automatically removed from the CIST. For more information see the section. For more information, see Automatically Inheriting Ports- MSTP Only on page 779. 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 in the encapsulation mode is EMISTP or PVST+. Only one carrier VLAN can exist in a given STPD, although some of its ports can be outside the control of any STPD at the same time. Note: The STPD ID must be identical to the VLAN ID of the carrier VLAN in that STPD. If you configure MSTP, you do not need a carrier VLAN. With MSTP, you configure a CIST that controls the connectivity of interconnecting MSTP regions and sends BPDUs across the regions to communicate the status of MSTP regions. All VLANs participating in the MSTP region have the same privileges. Protected VLAN Protected VLANs are all other VLANs that are members 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 STPDs, but any particular port in the VLAN can belong to only one STPD. Enabling autobind on a protected VLAN does not expand the boundary of the STPD. However, the VLAN and port combinations are added to or removed from the STPD subject to the boundaries of the carrier VLAN. 778 | Chapter 17. STP Commands