Configures the encapsulation mode for the specified port list.
| stpd_name | Specifies an STPD (Spanning Tree Domain) 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+. |
| port_list | Specifies one or more ports or slots and ports. |
Ports in the default STPD (s0) and user-created STPDs are dot1d mode.
If your STPD has the same name as another component, for example a VLAN (Virtual LAN), 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.
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.
dot1d—This mode is reserved for backward compatibility with previous STP versions. 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.
emistp—This mode sends BPDUs with an 802.1Q tag having an STPD ID in the VLAN ID field.
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
pvst-plus—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.
This encapsulation mode supports the following STPD modes of operation: 802.1D and 802.1w.
The following command configures STPD s1 with PVST+ packet formatting for slot 2, port 1:
configure stpd s1 ports mode pvst-plus 2:1
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, X590, X620, X690, X870 series switches.
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