Enhancements
Release M.10.17 Enhancements
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SNMP Trap
Switch
Event Log: port X is disable by STP
BPDU protection
Fake STP BPDU
End User
Figure 27. Example of BPDU Protection Enabled at the Network Edge
TerminologyBPDU — Acronym for bridge protocol data unit. BPDUs are data messages that are exchanged between the switches within an extended LAN that use a spanning tree protocol topology. BPDU packets contain information on ports, addresses, priorities and costs and ensure that the data ends up where it was intended to go. BPDU messages are exchanged across bridges to detect loops in a network topology. The loops are then removed by placing redundant switch ports in a backup, or blocked, state.
BPDU Filtering —
BPDU Protection —
MSTP — Multiple Spanning Tree Protocol, defined in IEEE 802.1s. Each MSTI (multiple spanning tree instance) on a physical port provides loop free connectivity for the group of VLANs associated with that instance. This means that traffic transported on different VLANs can be distributed for load- balancing among links between switches.
RSTP — Rapid Spanning Tree Protocol, defined in IEEE 802.1w and ratified in IEEE
92