Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル

To configure the default BPDU encapsulation mode on a per STPD basis, use the following 
command:

configure stpd <stpd_name> default-encapsulation [dot1d | emistp | pvst-plus]

Instead of accepting the default encapsulation modes of 

dot1d

 for the default STPD s0 and 

emistp

 for all other STPDs, this command allows you to specify the type of BPDU 

encapsulation to use for all ports added to the STPD (if not otherwise specified). 

An StpdID is used to identify each STP domain. You assign the StpdID when configuring the 
domain, and that carrier VLAN of that STPD cannot belong to another STPD. Unless all ports 
are running in 802.1D mode, an STPD with ports running in either EMISTP mode or PVST+ 
mode must be configured with an StpdID.

An StpdID must be identical to the VLAN ID of the carrier VLAN in that STP domain. For an 
802.1D STPD, the VLAN ID can be either a user-defined ID or one automatically assigned by 
the switch.

If an STPD contains at least one port not in 802.1D mode, you must 

configure the STPD with an StpdID.

MSTP uses two different methods to identify the STPDs that are part of the MSTP network. 
An instance ID of 0 identifies the CIST. The switch assigns this ID automatically when you 
configure the CIST STPD. An MSTI identifier (MSTI ID) identifies each STP domain that is 
part of an MSTP region. You assign the MSTI ID when configuring the STPD that participates 
in the MSTP region. In an MSTP region, MSTI IDs only have local significance. You can 
reuse MSTI IDs across MSTP regions. For more information about MSTP and MSTP 
features, see 

on page 557.

STP States

Each port that belongs to a member VLAN participating in STP exists in one of the following 
states:

Blocking

A port in the blocking state does not accept ingress traffic, perform traffic forwarding, or 
learn MAC source addresses. The port receives STP BPDUs. During STP initialization, 
the switch always enters the blocking state.

Listening

A port in the listening state does not accept ingress traffic, perform traffic forwarding, or 
learn MAC source addresses. The port receives STP BPDUs. This is the first transitional 
state a port enters after being in the blocking state. The bridge listens for BPDUs from 
neighboring bridge(s) to determine whether the port should or should not be blocked.