Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル
Chapter 18. STP
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NETGEAR 8800 User Manual
STPD Modes
An STPD has three modes of operation:
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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. When configured in
this mode, all rapid configuration mechanisms are disabled.
compatibility with third-party switches using IEEE standard 802.1D. When configured in
this mode, all rapid configuration mechanisms are disabled.
•
802.1w mode
Use this mode for compatibility with Rapid Spanning Tree (RSTP). When configured in
this mode, all rapid configuration mechanisms are enabled. The benefit of this mode is
available on point-to-point links only and when the peer is likewise configured in 802.1w
mode. If you do not select point-to-point links and the peer is not configured for 802.1w
mode, the STPD fails back to 802.1D mode.
this mode, all rapid configuration mechanisms are enabled. The benefit of this mode is
available on point-to-point links only and when the peer is likewise configured in 802.1w
mode. If you do not select point-to-point links and the peer is not configured for 802.1w
mode, the STPD fails back to 802.1D mode.
You enable or disable RSTP on a per STPD basis only. You do not enable RSTP on a per
port basis.
port basis.
For more information about RSTP and RSTP features, see
•
MSTP mode
Use this mode for compatibility with MSTP. MSTP is an extension of RSTP and offers the
benefit of better scaling with fast convergence. When configured in this mode, all rapid
configuration mechanisms are enabled. The benefit of MSTP is available only on
point-to-point links and when you configure the peer in MSTP or 802.1w mode. If you do
not select point-to-point links and the peer is not configured in 802.1w mode, the STPD
fails back to 802.1D mode.
benefit of better scaling with fast convergence. When configured in this mode, all rapid
configuration mechanisms are enabled. The benefit of MSTP is available only on
point-to-point links and when you configure the peer in MSTP or 802.1w mode. If you do
not select point-to-point links and the peer is not configured in 802.1w mode, the STPD
fails back to 802.1D mode.
You must first configure a CIST before configuring any MSTIs in the region. You cannot
delete or disable a CIST if any of the MSTIs are active in the system.
delete or disable a CIST if any of the MSTIs are active in the system.
You create only one MSTP region on the switch, and all switches that participate in the
region must have the same regional configurations. You enable or disable an MSTP on a
per STPD basis only. You do not enable MSTP on a per port basis.
region must have the same regional configurations. You enable or disable an MSTP on a
per STPD basis only. You do not enable MSTP on a per port basis.
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.
For more information about MSTP and MSTP features, see
By default:
•
The STPD operates in 802.1D mode.
•
The default device configuration contains a single STPD called s0.
•
The default VLAN is a member of STPD s0 with autobind enabled.
To configure the mode of operation of an STPD, use the following command: