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16
C
HAPTER
2: R
ELEASE
H
IGHLIGHTS
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.