Single Spanning Tree (Sstp) - HP ProCurve 9304M Installation And Configuration Manual

Installation and Basic Configuration Guide
NOTE: This command does not also enable STP. To enable STP, first enter the spanning-tree command
without the rstp parameter. After you enable STP, enter the spanning-tree rstp command to enable 8021.W
Draft 3.
To disable 8021.W Draft 3, enter the following command:
HP9300(config-vlan-10)# no spanning-tree rstp
Enabling 8021.W Draft 3 When Single STP Is Enabled
To enable 8021.W Draft 3 on a device that is running single STP, enter the following command at the global
CONFIG level of the CLI:
HP9300(config)# spanning-tree single rstp
Syntax: [no] spanning-tree single rstp
This command enables 8021.W Draft 3 on the whole device.
NOTE: This command does not also enable single STP. To enable single STP, first enter the spanning-tree
single command without the rstp parameter. After you enable single STP, enter the spanning-tree single rstp
command to enable 8021.W Draft 3.
To disable 8021.W Draft 3 on a device that is running single STP, enter the following command:
HP9300(config)# no spanning-tree single rstp

Single Spanning Tree (SSTP)

By default, each port-based VLAN on an HP device runs a separate spanning tree, which you can enable or
disable on an individual VLAN basis.
Alternatively, you can configure an HP device to run a single spanning tree across all ports and VLANs on the
device. The Single STP feature (SSTP) is especially useful for connecting an HP device to third-party devices
that run a single spanning tree in accordance with the 802.1q specification.
SSTP uses the same parameters, with the same value ranges and defaults, as the default STP support on HP
devices. See "STP Parameters and Defaults" on page 8-2.
SSTP Defaults
SSTP is disabled by default. When you enable the feature, all VLANs on which STP is enabled become members
of a single spanning tree. All VLANs on which STP is disabled are excluded from the single spanning tree.
• To add a VLAN to the single spanning tree, enable STP on that VLAN.
• To remove a VLAN from the single spanning tree, disable STP on that VLAN.
When you enable SSTP, all the ports that are in port-based VLANs with STP enabled become members of a
single spanning tree domain. Thus, the ports share a single BPDU broadcast domain. The HP device places all
the ports in a non-configurable VLAN, 4094, to implement the SSTP domain. However, this VLAN does not affect
port membership in the port-based VLANs you have configured. Other broadcast traffic is still contained within the
individual port-based VLANs. Therefore, you can use SSTP while still using your existing VLAN configurations
without changing your network. In addition, SSTP does not affect 802.1q tagging. Tagged and untagged ports
alike can be members of the single spanning tree domain.
NOTE: When SSTP is enabled, the BPDUs on tagged ports go out untagged.
If you disable SSTP, all VLANs that were members of the single spanning tree run MSTP instead. In MSTP, each
VLAN has its own spanning tree. VLANs that were not members of the single spanning tree were not enabled for
STP. Therefore, STP remains disabled on those VLANs.
Enabling SSTP
To enable SSTP, use one of the following methods.
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