Configures the default encapsulation mode for all ports added to the specified STPD (Spanning Tree Domain).
| stpd_name | Specifies an STPD name on the switch. |
| dot1d | Specifies the STP (Spanning Tree Protocol) encapsulation mode of operation to be 802.1d. |
| emistp | Specifies the STP encapsulation mode of operation to be EMISTP. |
| pvst-plus | Specifies the STP encapsulation mode of operation to be PVST+. |
Ports in the default STPD (s0) are dot1d mode.
Ports in user-created STPDs are in dot1d mode.
Care must be taken to ensure that ports in overlapping domains do not interfere with the orderly working of each domain‘s protocol.
By default, when the switch boots for the first time, it automatically creates a VLAN (Virtual LAN) named default with a tag value of 1 and STPD s0. The switch associates VLAN default to STPD s0. All ports that belong to this VLAN and STPD are in 802.1d encapsulation mode with autobind enabled. If you disable autobind on the VLAN default, that configuration is saved across a reboot.
MSTP (Multiple Spanning Tree Protocol) STPDs use 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.
If your STPD has the same name as another component, for example a VLAN, we recommend that you specify the identifying keyword as well as the name. If your STPD has a name unique only to that STPD, the keyword stpd is optional. For name creation guidelines and a list of reserved names, see Object Names.
This encapsulation mode supports the following STPD modes of operation: 802.1D, 802.1w, and MSTP.
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
Note
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 for which it belongs.An StpdID is used to identify each STP domain. You assign the StpdID when configuring the domain. An STPD ID must be identical to the VLAN ID of the carrier VLAN in that STP domain, and that VLAN cannot belong to another STPD.
MSTP uses two different methods to identify the STPDs that are part of the MSTP network. An instance ID of 0 identifies the Common and Internal Spanning Tree (CIST). The switch assigns this ID automatically when you configure the CIST STPD. A multiple spanning tree instance identifier identifies each STP domain that is part of an MSTP region. You assign the MSTI (Multiple Spanning Tree Instances) 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.
The following example specifies that all ports subsequently added to the STPD STPD1 be in PVST+ encapsulation mode unless otherwise specified or manually changed:
configure stpd stpd1 default-encapsulation pvst-plus
This command was first available in ExtremeXOS 10.1.
This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.
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