Netgear XCM8806 Chassis User Manual - Page 530
Encapsulation Modes, Multiple Instance Spanning Tree Protocol EMISTP mode
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NETGEAR 8800 User Manual configure stpd mode [dot1d | dot1w | mstp [cist | msti ]] All STP parameters default to the IEEE 802.1D values, as appropriate. Encapsulation Modes You can configure ports within an STPD to accept specific BPDU encapsulations. This STP port encapsulation is separate from the STP mode of operation. For example, you can configure a port to accept the PVST+ BPDU encapsulation while running in 802.1D mode. An STP port has three possible encapsulation modes: • 802.1D mode Use this mode for backward compatibility with previous STP versions and for compatibility with third-party switches using IEEE standard 802.1D. 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. • Multiple Instance Spanning Tree Protocol (EMISTP) mode EMISTP mode is proprietary to NETGEAR and is an extension of STP that allows a physical port to belong to multiple STPDs by assigning the port to multiple VLANs. EMISTP adds significant flexibility to STP network design. BPDUs are sent with an 802.1Q tag having an STPD instance Identifier (STPD ID) in the VLAN ID field. This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w. • Per VLAN Spanning Tree (PVST+) mode 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 port 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 to which it belongs. If configured in MSTP mode, an STPD uses the 802.1D BPDU encapsulation mode by default. To ensure correct operation of your MSTP STPDs, do not configure EMISTP or PVST+ encapsulation mode for MSTP STPDs. To configure the BPDU encapsulation mode for one or more STP ports, use the following command: configure stpd ports mode [dot1d | emistp | pvst-plus] 530 | Chapter 18. STP
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