Netgear XCM8806 Chassis User Manual - Page 531
STP States, STPD Identifier
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NETGEAR 8800 User Manual To configure the default BPDU encapsulation mode on a per STPD basis, use the following command: configure stpd 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). STPD Identifier 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. Note: 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 Multiple Spanning Tree Protocol 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. Chapter 18. STP | 531
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