HP 5400ZL - Manual (Page 156)

Multiple Instance Spanning-Tree Operation
Configuring MSTP
BPDU protected ports are displayed as separate entries of the spanning tree
category within the configuration file.
ProCurve(config)# show configuration
. . .
spanning-tree Trk2 priority 4
. . .
spanning-tree
spanning-tree A1 bpdu-protection
spanning-tree C7 bpdu-protection
Rows showing ports with BPDU protection enabled
Figure 4-9. Example of BPDU Filters in the Show Configuration Command
PVST Protection and Filtering
N o t e These options are available for switches that support the MSTP protocol only.
They are not supported for switches running RSTP.
PVST Protection
If a ProCurve switch in the core of a network receives Per Vlan Spanning Tree
(PVST) BPDUs and forwards the unrecognized PVST BPDUs on to MSTP-only
switches, those switches then disconnect themselves from the network. This
can create instability in the network infrastructure.
When the PVST protection feature is enabled on a port and a PVST BPDU is
received on that port, the interface on which the PVST BPDU arrived is shut
down, which isolates the sending switch from the rest of the network. An event
message is logged and an SNMP notification trap is generated. The errant
BPDU counter
hpSwitchStpPortErrantBpduCounter is incremented. The PVST
protection feature is enabled per-port.
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