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drop-threshold

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 10.0 for EX Series switches.

Description

Specify the maximum number of Layer 2 PDUs of the specified protocol that can be received per second on the interfaces in a specified VLAN before the switch begins dropping the Layer 2 PDUs. The drop threshold value must be less than or equal to the shutdown threshold value.

L2PT processing is done by the CPU, and L2PT traffic to the CPU is rate-limited to a maximum of 1000 pps. If traffic is received at a rate faster than this limit, the rate limit causes the traffic to be dropped before it hits the threshold and the dropped packets are not reported in L2PT statistics. This can also occur if you configure a drop threshold that is less than 1000 pps but traffic is received at a faster rate. For example, if you configure a drop threshold of 900 pps and the VLAN receives traffic at rate of 1100 pps, L2PT statistics will show that 100 packets were dropped. The 100 packets dropped because of the rate limit will not be reported. Similarly, if you do not configure a drop threshold and the VLAN receives traffic at rate of 1100 pps, the 100 packets dropped because of the rate limit are not reported.

Note

If the drop threshold value is greater than the shutdown threshold value and you try to commit the configuration, the commit operation fails.

You can specify a drop threshold value without specifying a shutdown threshold value.

Default

No drop threshold is specified.

Options

number—Maximum number of Layer 2 PDUs of the specified protocol that can be received per second on the interfaces in a specified VLAN before the switch begins dropping the Layer 2 PDUs.

Range: 1 through 1000

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.