16 CHAPTER 2: RELEASE HIGHLIGHTS
You configure the front-panel ports to participate in this algorithm using
three options in the bridge loopdetectmode menu:
■disable — This default setting disables the module ’s port-based
algorithm.
■enable — When you configure the module using the bridge
loopdetectmode enable option, the module searches for traffic
loops by comparing Spanning Tree Bridge Protocol Data Unit (BPDU)
packets that enter its backplane port with BPDU packets that enter its
front-panel ports. If the module detects the same BPDU packet
coming through both its backplane port and any front-panel port, the
module:
■Disables the front-panel port where the BPDU packet entered.
■Sends a trap to the EME.
■Displays loop detect for the port status in the
bridge port summary and bridge port detail
displays.
■immediate — When you configure the module using the bridge
loopdetectmode immediate option, the module searches for
any Spanning Tree BPDU packets that are received on its front-panel
ports. If the module detects that a BPDU packet is received on any
front-panel port, the module:
■Disables the front-panel port where the BPDU packet entered.
■Sends a trap to the EME.
■Displays bpdu detect for the port status in the
bridge port summary and bridge port detail
displays.