Netgear XCM8806 Chassis Hardware Installation Guide - Page 771

NETGEAR 8800 Chassis Switch CLI Manual • A VLAN/port for which the carrier VLAN does not yet belong 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, NETGEAR 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 vlan and stpd are optional. STP Encapsulation Modes You can specify the following STP encapsulation modes: • dot1d-This mode is reserved for backward compatibility with previous STP versions. BPDUs are 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. • emistp-This mode sends BPDUs with an 802.1Q tag having an STPD ID in the VLAN ID field. This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w. • pvst-plus-This mode implements PVST+ in compatibility with third-party switches running this 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. Chapter 17. STP Commands | 771