Configuring Policers - Dell PowerConnect J-EX4200-24T Software Manual

Configuring Policers

the policer that the term references. Each policer that you configure includes an implicit
counter. To get term-specific packet counts, you must configure a new policer for each
filter term that requires policing.
The following policer limits apply on the switch:
A maximum of 512 policers can be configured for port firewall filters.
A maximum of 512 policers can be configured for VLAN and Layer 3 firewall filters.
If the policer configuration exceeds these limits, the switch returns the following message
after the commit operation:
Cannot assign policers: Max policer limit reached
Configuring Policers on page 2789
1.
Specifying Policers in a Firewall Filter Configuration on page 2790
2.
Applying a Firewall Filter That Is Configured with a Policer on page 2790
3.
To configure a policer:
Specify the name of the policer:
1.
[edit firewall]
user@switch# set policer policer-one
The policer name can contain letters, numbers, and hyphens (-) and can be up to 64
characters long.
Configure rate limiting for the policer:
2.
Specify the bandwidth limit in bits per second (bps) to control the traffic rate on
a.
an interface:
[edit firewall policer policer-one]
user@switch# set if-exceeding bandwidth-limit 300k
The range for the bandwidth limit is 1k through 102.3g bps.
Specify the maximum allowed burst size to control the amount of traffic bursting:
b.
[edit firewall policer policer-one]
user@switch# set if-exceeding burst-size-limit 500k
To determine the value for the burst-size limit, multiply the bandwidth of the
interface on which the filter is applied by the amount of time to allow a burst of
traffic at that bandwidth to occur:
burst size = bandwidth * allowable time for burst traffic
The range for the burst-size limit is 1 through 2,147,450,880 bytes.
Specify the policer action
3.
[edit firewall policer]
user@switch# set policer-one then discard
to discard packets that exceed the rate limits:
discard
Chapter 102: Configuring Firewall Filters
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