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Example: Configuring a Two-Color Logical Interface (Aggregate) Policer
Starting in Junos OS Release 15.1X49-D40 and Junos OS Release 17.3R1, you can configure a single-rate two-color policer as a logical interface policer and apply it to incoming IPv4 traffic on a logical interface. This example shows how to do to so.
Requirements
Before you begin, make sure that the logical
interface to which you apply the two-color logical interface policer
is hosted on a Gigabit Ethernet interface (ge-) or a 10-Gigabit
Ethernet interface (xe-).
Overview
In this example, you configure the single-rate two-color policer policer_IFL as a logical interface policer and apply it to
incoming IPv4 traffic at logical interface ge-1/3/1.0.
Topology
If the input IPv4 traffic on the physical interface ge-1/3/1 exceeds the bandwidth limit equal to 90 percent of the media
rate with a 300 KB burst-size limit, then the logical interface
policer policer_IFL rate-limits the input IPv4 traffic
on the logical interface ge-1/3/1.0. Configure the policer
to mark nonconforming traffic by setting packet loss priority (PLP)
levels to high and classifying packets as best-effort.
As the incoming IPv4 traffic rate on the physical interface slows and conforms to the configured limits, Junos OS stops marking the incoming IPv4 packets at the logical interface.
Configuration
The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode.
To configure this example, perform the following tasks:
- CLI Quick Configuration
- Configuring the Logical Interfaces
- Configuring the Single-Rate Two-Color Policer as a Logical Interface Policer
- Applying the Logical Interface Policer to Input IPv4 Traffic at a Logical Interface
CLI Quick Configuration
To quickly configure this example, copy the following
commands, paste them into a text file, remove any line breaks, change
any details necessary to match your network configuration, copy and
paste the commands into the CLI at the [edit] hierarchy
level, and then enter commit from configuration mode.
set interfaces ge-1/3/1 vlan-tagging set interfaces ge-1/3/1 unit 0 vlan-id 100 set interfaces ge-1/3/1 unit 0 family inet address 10.10.10.1/30 set interfaces ge-1/3/1 unit 1 vlan-id 101 set interfaces ge-1/3/1 unit 1 family inet address 20.20.20.1/30 arp 20.20.20.2 mac 00:00:11:22:33:44 set firewall policer policer_IFL logical-interface-policer set firewall policer policer_IFL if-exceeding bandwidth-percent 90 set firewall policer policer_IFL if-exceeding burst-size-limit 300k set firewall policer policer_IFL then loss-priority high set firewall policer policer_IFL then forwarding-class best-effort set interfaces ge-1/3/1 unit 0 family inet policer input policer_IFL
Configuring the Logical Interfaces
Step-by-Step Procedure
To configure the logical interfaces:
Enable configuration of the interface.
[edit] user@host# edit interfaces ge-1/3/1
Configure single tagging.
[edit interfaces ge-1/3/1] user@host# set vlan-tagging
Configure logical interface
ge-1/3/1.0.[edit interfaces ge-1/3/1] user@host# set unit 0 vlan-id 100 user@host# set unit 0 family inet address 10.10.10.1/30
Configure logical interface
ge-1/3/1.0.[edit interfaces ge-1/3/1] user@host# set unit 1 vlan-id 101 user@host# set unit 1 family inet address 20.20.20.1/30 arp 20.20.20.2 mac 00:00:11:22:33:44
Results
Confirm the configuration of the logical interfaces by
entering the show interfaces configuration mode command.
If the command output does not display the intended configuration,
repeat the instructions in this procedure to correct the configuration.
[edit]
user@host# show interfaces
ge-1/3/1 {
vlan-tagging;
unit 0 {
vlan-id 100;
family inet {
address 10.10.10.1/30;
}
}
unit 1 {
vlan-id 101;
family inet {
address 20.20.20.1/30 {
arp 20.20.20.2 mac 00:00:11:22:33:44;
}
}
}
}
Configuring the Single-Rate Two-Color Policer as a Logical Interface Policer
Step-by-Step Procedure
To configure a single-rate two-color policer as a logical interface policer:
Enable configuration of a single-rate two-color policer.
[edit] user@host# edit firewall policer policer_IFL
Specify that the policer is a logical interface (aggregate) policer.
[edit firewall policer policer_IFL] user@host# set logical-interface-policer
A logical interface policer rate-limits traffic based on a percentage of the media rate of the physical interface underlying the logical interface to which the policer is applied. The policer is applied directly to the interface rather than referenced by a firewall filter.
Specify the policer traffic limits.
Specify the bandwidth limit.
To specify the bandwidth limit as an absolute rate, from 8,000 bits per second through 50,000,000,000 bits per second, include the
bandwidth-limit bpsstatement.To specify the bandwidth limit as a percentage of the physical port speed on the interface, include the
bandwidth-percent percentstatement.
In this example, the CLI commands and output are based on a bandwidth limit specified as a percentage rather than as an absolute rate.
[edit firewall policer policer_IFL] user@host# set if-exceeding bandwidth-percent 90
Specify the burst-size limit, from 1,500 bytes through 100,000,000,000 bytes, which is the maximum packet size to be permitted for bursts of data that exceed the specified bandwidth limit.
[edit firewall policer policer_IFL] user@host# set if-exceeding burst-size-limit 300k
Specify the policer actions to be taken on traffic that exceeds the configured rate limits.
To discard the packet, include the
discardstatement.To set the loss-priority value of the packet, include the
loss-priority (low | medium-low | medium-high | high)statement.To classify the packet to a forwarding class, include the
forwarding-class (forwarding-class | assured-forwarding | best-effort | expedited-forwarding | network-control)statement.
In this example, the CLI commands and output are based on both setting the packet loss priority level and classifying the packet.
[edit firewall policer policer_IFL] user@host# set then loss-priority high user@host# set then forwarding-class best-effort
Results
Confirm the configuration of the policer by entering
the show firewall configuration mode command. If the command
output does not display the intended configuration, repeat the instructions
in this procedure to correct the configuration.
[edit]
user@host# show firewall
policer policer_IFL {
logical-interface-policer;
if-exceeding {
bandwidth-percent 90;
burst-size-limit 300k;
}
then {
loss-priority high;
forwarding-class best-effort;
}
}
Applying the Logical Interface Policer to Input IPv4 Traffic at a Logical Interface
Step-by-Step Procedure
To apply the two-color logical interface policer to input IPv4 traffic a logical interface:
Enable configuration of the logical interface.
[edit] user@host# edit interfaces ge-1/3/1 unit 0
Apply the policer to all traffic types or to a specific traffic type on the logical interface.
To apply the policer to all traffic types, regardless of the protocol family, include the
policer (input | output) policer-namestatement at the[edit interfaces interface-name unit number]hierarchy level.To apply the policer to traffic of a specific protocol family, include the
policer (input | output) policer-namestatement at the[edit interfaces interface-name unit unit-number family family-name]hierarchy level.
To apply the logical interface policer to incoming packets, use the
policer input policer-namestatement. To apply the logical interface policer to outgoing packets, use thepolicer output policer-namestatement.In this example, the CLI commands and output are based on rate-limiting the IPv4 input traffic at logical interface
ge-1/3/1.0.[edit interfaces ge-1/3/1 unit 0] user@host# set family inet policer input policer_IFL
Results
Confirm the configuration of the interface by entering
the show interfaces configuration mode command. If the
command output does not display the intended configuration, repeat
the instructions in this procedure to correct the configuration.
[edit]
user@host# show interfaces
ge-1/3/1 {
vlan-tagging;
unit 0 {
vlan-id 100;
family inet {
policer input policer_IFL;
address 10.10.10.1/30;
}
}
unit 1 {
vlan-id 101;
family inet {
address 20.20.20.1/30 {
arp 20.20.20.2 mac 00:00:11:22:33:44;
}
}
}
}
If you are done configuring the device, enter commit from configuration mode.
Verification
Confirm that the configuration is working properly.
- Displaying Traffic Statistics and Policers for the Logical Interface
- Displaying Statistics for the Policer
Displaying Traffic Statistics and Policers for the Logical Interface
Purpose
Verify the traffic flow through the logical interface and that the policer is evaluating packets received on the logical interface.
Action
Use the show interfaces operational mode command
for logical interface ge-1/3/1.0, and include the detail or extensive option. The command output section
for Traffic statistics lists the number
of bytes and packets received and transmitted on the logical interface.
The Protocol inet subsection contains
a Policer field that would list the policer policer_IFL as an input or output logical interface policer
as follows:
Input: policer_IFL-ge-1/3/1.0-log_int-i
Output: policer_IFL-ge-1/3/1.0-log_int-o
The log_int-i suffix denotes a logical interface policer applied to input traffic, while the log_int-o suffix denotes a logical interface policer applied to output traffic. In this example, the logical interface policer is applied to input traffic only.
Displaying Statistics for the Policer
Purpose
Verify the number of packets evaluated by the policer.
Action
Use the show policer operational mode command
and, optionally, specify the name of the policer. The command output
displays the number of packets evaluated by each configured policer
(or the specified policer), in each direction. For the policer policer_IFL, the input and output policer names are displayed
as follows:
policer_IFL-ge-1/3/1.0-log_int-i
policer_IFL-ge-1/3/1.0-log_int-o
The log_int-i suffix denotes a logical interface policer applied to input traffic, while the log_int-o suffix denotes a logical interface policer applied to output traffic. In this example, the logical interface policer is applied to input traffic only.
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