KB.15.15

Enabling and disabling PVST protection on ports

Syntax:

[no] spanning-tree port-list pvst-protection

Enables or disables PVST protection on the port(s) specified. The command indicates

which ports are not expected to receive any PVST BPDUs.

Default: Disabled on all ports.

Example 61 Enabling PVST protection

To enable the PVST protection feature on ports 4 through 8, enter:

HP Switch(config)#: spanning-tree 4-8 pvst-protection

To disable the PVST protection feature on a port, for example, port 4, enter:

HP Switch(config)#: no spanning-tree 4 pvst-protection

Enabling and disabling PVST filters on ports

Syntax:

[no] spanning-tree port-list pvst-filter

Enables or disables PVST filters on the port(s) specified. The command indicates

which ports are not expected to receive any PVST BPDUs.

Default: Disabled on all ports

Example 62 Enabling PVST filtering on a port

HP Switch(config)#: spanning-tree 8 pvst-filter

Warning: The BPDU filter allows the port to go into a continuousforwarding mode and spanning-tree will not

interfere, even if theport would cause a loop to form in the network topology.

If you suddenly experience high traffic load, disable the port and reconfigure the BPDU filter with the CLI

command(s):

"no spanning-tree PORT_LIST bpdu-filter"

"no spanning-tree PORT_LIST pvst-filter"

Re-enabling a port manually

Syntax:

[no] spanning-tree bpdu-protection-timeout timeout

Configures the duration of time protected ports remain disabled. The default value

of 0 sets an infinite timeout, so ports that are disabled are not re-enabled

automatically.

NOTE: This is a GLOBAL command.

Range: 0 - 65535 seconds

Default: 0

You can also set the timeout in the MIB with this MIB object:

hpSwitchStpBpduProtectionTimeout

It is also possible to use the following automatic re-enable timer command:

HP Switch(config)#: spanning-tree bpdu-protection-timeout 120

Enabling and disabling PVST protection on ports 89