KB.15.15

ManualsBrandsHP ManualsNetwork HardwareHP 5412R zl2 Switch

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To globally enable RPVST+ on all VLANs on the switch, use either of the following:

spanning-tree [ enable ]

[no] spanning-tree disable

To globally disable RPVST+ on all VLANs on the switch, use any of the following:

[no] spanning-tree

spanning-tree disable

[no] spanning-tree enable

NOTE: This status will always be shown in show run to let you know whether

the spanning-tree is enabled. Having spanning tree present but not enabled will

lead to a change in the existing factory default settings.

NOTE: This command overrides the per-VLAN enable/disable command (below).

Syntax:

spanning-tree vlan vid list [ enable | disable ]

To enable RPVST+ on one or more VLANs on the switch, use either of the following:

spanning-tree vlan vid list enable

[no] spanning-tree vlan vid list disable

To disable RPVST+ on one or more VLANs on the switch, use any of the following:

[no] spanning-tree vlan vid list

spanning-tree vlan vid list disable

[no] spanning-tree vlan vid list enable

Configuring BPDU filtering

The STP BPDU filter feature allows control of spanning tree participation on a per-port basis. It can

be used to exclude specific ports from becoming part of spanning tree operations. A port with the

BPDU filter enabled will ignore incoming BPDU packets on all VLANs where the port is a member,

and stay locked in the spanning tree forwarding state. All other ports will maintain their role.

Syntax:

[no] spanning-tree [ port-list | all ] bpdu-filter

Enables/disables BPDU filtering on the specified port(s). The bpdu-filter option

forces a port to always stay in the forwarding state and be excluded from standard

STP operation.

Sample scenarios in which this feature may be used:

• To have STP operations running on selected ports of the switch rather than

every port of the switch at a time.

• To prevent the spread of errant BPDU frames.

• To eliminate the need for a topology change when a port's link status changes.

For example, ports that connect to servers and workstations can be configured

to remain outside of spanning tree operations.

• To protect the network from denial of service attacks that use spoofing BPDUs

by dropping incoming BPDU frames. For this scenario, BPDU protection offers

136 Rapid per-VLAN spanning tree (RPVST+) operation