3com MSR 20-20 참조 매뉴얼

de: Discards the FR packet whose DE flag bit is 1 when congestion occurs.

ecn: Processes the BECN and FECN flag bits of FR packets when congestion 
occurs.

queue-percentage: Network congestion threshold, the occupation ratio of the 
interface queue, equal to the percentage of current queue length to the total 
queue length of the interface, ranging from 1 to 100. By default, it is 100.

Use the fr congestion-threshold command to enable congestion management 
function of a FR interface.

Use the undo fr congestion-threshold command to disable this function.

By default, the congestion management function of a FR interface is disabled.

This command is similar to the congestion-threshold command. The difference 
is that this command is applied to FR interfaces, while the congestion-threshold 
command is applied to FR virtual circuit.

n

# Set to process the flag bit of a FR packet when the interface queue length 
exceeds 80% of the total length.

<Sysname> system-view

[Sysname]interface Serial 1/0

[Sysname-Serial1/0] fr congestion-threshold de 80 

fr de del list-number dlci dlci-number

undo fr de del list-number dlci dlci-number

Frame relay interface (main interface or subinterface) view, MFR interface view

list-number: DE rule list number, ranging from 1 to 10.

dlci-number: Frame relay virtual circuit number, ranging from 16 to 1007.

Use the fr de del command to apply a DE rule list to the specified FR virtual 
circuit.

Use the undo fr de del command to delete a DE rule list from virtual circuit.

By default, no DE rule list is applied to FR virtual circuit.