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A Loop Occurs When an Edge Port Is Configured on an S5700

Publication Date:  2019-04-08 Views:  147 Downloads:  0

Issue Description

After an STP protocol is enabled on a switch and one of its interfaces is configured as an edge port, a loop occurs on the network.

Alarm Information

#Apr 26 2018 13:56:10 8F-SW03 IFNET/4/INBWRATEEXCEED:OID Interface input flow bandwidth usage exceeded the trap threshold.(Interface=9, BandWidthUsage=90, TrapThreshold=90, InterfaceName=GigabitEthernet0/0/5)

#Apr 26 2018 13:56:10 8F-SW03 IFNET/4/OUTBWRATEEXCEED:OID Interface output flow bandwidth usage exceeded the trap threshold. (Interface=8, BandWidthUsage=90, TrapThreshold=90, InterfaceName=GigabitEthernet0/0/4)

Handling Process

Check whether the interface configuration is correct. The configuration is as follows:

interface GigabitEthernet0/0/4

port link-type access

port default vlan x

stp edged-port enable


interface GigabitEthernet0/0/5

port link-type access

port default vlan x

stp edged-port enable

Obtain packets on the interface. It is found that no BPDU is sent or received on the interface.

Check whether BPDU filter ports are configured globally. The stp bpdu-filter default configuration is found.

Root Cause

The stp bpdu-filter default command is configured globally. This command configures all edge ports on the switch as BPDU filter ports. The BPDU filter ports do not send or receive BPDUs.


Run the undo stp bpdu-filter default command to configure all edge ports on the device as non-BPDU filter ports.