configure vlan add ports stpd

configure vlan vlan_name add ports [all | port_list] {tagged {tag} | untagged} stpd stpd_name {[dot1d | emistp | pvst-plus]}

Description

Adds one or more ports in a VLAN to a specified STPD.

Syntax Description

vlan_name Specifies a VLAN name.
all Specifies all of the ports to be included in the STPD.
port_list Specifies the port or ports to be included in the STPD.
tagged Specifies the ports should be configured as tagged.
tag Specifies the port-specific VLAN tag. When there are multiple ports specified in the port_list, the same tag is used for all of them. When unspecified port tag is equal to the VLAN tag.
untagged Specifies the ports should be configured as untagged.
stpd_name Specifies an STPD name on the switch.
dot1d Specifies the STP 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+.

Default

Ports in the default STPD (s0) are in dot1.d mode.

Ports in user-created STPDs are in emistp mode.

Usage Guidelines

To create a VLAN, use the create vlan command. To create an STP domain, use the create stpd command.

In an EMISTP or PVST+ environment, this command adds a list of ports to a VLAN and a specified STPD at the same time provided the carrier VLAN already exists on the same set of ports. You can also specify the encapsulation mode for those ports.

In an MSTP environment, you do not need a carrier VLAN. A CIST controls the connectivity of interconnecting MSTP regions and sends BPDUs across the regions to communicate region status. You must use the dot1d encapsulation mode in an MSTP environment.

You cannot configure STP on the following ports:
  • Mirroring target ports.
  • Software-controlled redundant ports.

If you see an error similar to the following:

 Error: Cannot add VLAN default port 3:5 to STP domain
You might be attempting to add:
  • A carrier VLAN port to a different STP domain than the carrier VLAN belongs.
  • A VLAN/port for which the carrier VLAN does not yet belong.
    Note

    Note

    This restriction is only enforced in an active STP domain and when you enable STP to ensure you have a legal STP configuration.

Naming Conventions

If your VLAN has the same name as another component, for example an STPD, we recommend that you specify the identifying keyword as well as the name. If your VLAN has a name unique only to that VLAN, the keywords vlan and stpd are optional.

STP Encapsulation Modes

You can specify the following STP encapsulation modes:

  • 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.

These encapsulation modes are for STP ports, not for physical ports. When a physical ports 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.

MSTP STPDs use only 802.1D BPDU encapsulation mode. The switch prevents you from configuring EMISTP or PVST+ encapsulation mode for MSTP STPDs.

Specify the port tag when you need to put multiple vlans into a broadcast domain.

Automatically Inheriting Ports--MSTP Only

In an MSTP environment, whether you manually or automatically bind a port to an MSTI in an MSTP region, the switch automatically binds that port to the CIST. The CIST handles BPDU processing for itself and all of the MSTIs; therefore, the CIST must inherit ports from the MSTIs in order to transmit and receive BPDUs.

Example

The following command adds slot 1, port 2 and slot 2, port 3, members of a VLAN named Marketing, to the STPD named STPD1, and specifies that they be in EMISTP mode: 

configure vlan marketing add ports 1:2, 2:3 tagged stpd stpd1 emistp

The following examples illustrate the tag variable in ExtremeXOS 15.4.

The following example configures vlan with tag 100 and port tag of 10 and 11 on two different ports:

create vlan exchange tag 100
config vlan exchange add ports 3 tagged 10
config vlan exchange add ports 4 tagged 11

The following example configures a VLAN with tag 100, and port tag of 10 and 11 on the same ports:

create vlan exchange tag 100
config vlan exchange add ports 3 tagged 10
config vlan exchange add ports 3 tagged 11

The following example configures VLAN with tag 100, and port tag of 10 on two ports and 11 on a different port: 

create vlan exchange tag 100
config vlan exchange add ports 2:3,2:4 tagged 10
config vlan exchange add ports 2:5 tagged 11

History

This command was first available in ExtremeXOS 10.1.

The nobroadcast keyword was removed in ExtremeXOS 11.4.

The tag variable was added in ExtremeXOS 15.4.

Platform Availability

This command is available on all Universal switches supported in this document.

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