Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル
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Chapter 18. STP
NETGEAR 8800 User Manual
configure stpd <stpd_name> mode [dot1d | dot1w | mstp [cist | msti <instance>]]
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.
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.
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.
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.
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.
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.
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.
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.
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.
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:
command:
configure stpd <stpd_name> ports mode [dot1d | emistp | pvst-plus] <port_list>