HP 5400ZL - Manual (Page 158)

Multiple Instance Spanning-Tree Operation
Configuring MSTP
PVST Filtering I
If you configure a port for PVST filtering instead of PVST protection, the port
remains in operation but traps are still generated and the BPDU counter
hpSwitchStpPortErrantBpduCounter is incremented.
C a u t i o n Enabling the PVST filter feature allows the port to continuously forward
packets without spanning-tree intervention, which could result in loop forma­
tion. If this occurs, disable the port and then reconfigure it with these com­
mands:
no spanning-tree <port-list> bpdu-filter
no spanning-tree <port-list> pvst-filter
Syntax: [no] spanning-tree <port-list> pvst-filter
Enables or disables the PVST filter feature on the port or range
of ports specified. The command indicates which ports are
not expected to receive any PVST BPDUs.
Default: Disabled on all ports
ProCurve(config)# spanning-tree 8 pvst-filter
Warning: The BPDU filter allows the port to go into a continuous
forwarding mode and spanning-tree will not interfere, even if
the port 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"
Figure 4-11. Example of Enabling PVST Filtering on a Port
Manually Re-enabling a Port
You can re-enable ports manually or use the automatic re-enable timer com­
mand as shown:
ProCurve(config)# spanning-tree
bpdu-protection-timeout 120
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