Two-Color and Three-Color Policers at Layer 2
Two-Color Policing at Layer 2 Overview
- Guidelines for Configuring Two-Color Policing of Layer 2 Traffic
- Statement Hierarchy for Configuring a Two-Color Policer for Layer 2 Traffic
- Statement Hierarchy for Applying a Two-Color Policer to Layer 2 Traffic
Guidelines for Configuring Two-Color Policing of Layer 2 Traffic
The following guidelines apply to two-color policing of Layer 2 traffic:
You can apply a two-color policer to ingress or egress Layer 2 traffic at a logical interface hosted on a Gigabit Ethernet interface (
ge-) or a 10-Gigabit Ethernet interface (xe-) only.A single logical interface supports Layer 2 policing in both directions.
You can apply a two-color policer to Layer 2 traffic as a logical interface policer only. You cannot apply a two-color policer to Layer 2 traffic as a stateless firewall filter action.
You can apply a two-color policer to Layer 2 traffic by referencing the policer in the interface configuration at the logical unit level, and not at the protocol level.
For information about configuring three-color policing of Layer 2 traffic, see Three-Color Policing at Layer 2 Overview.
Statement Hierarchy for Configuring a Two-Color Policer for Layer 2 Traffic
To enable a single-rate two-color policer to rate-limit Layer 2 traffic, include the logical-interface-policer statement in the policer configuration.
firewall {
policer policer-name {
logical-interface-policer;
if-exceeding {
(bandwidth-limit bps | bandwidth-percent percentage);
burst-size-limit bytes;
}
then {
discard;
forwarding-class class-name;
loss-priority (high | low | medium-high | medium-low);
}
}
}
You can include the configuration at the following hierarchy levels:
[edit][edit logical-systems logical-system-name]
Statement Hierarchy for Applying a Two-Color Policer to Layer 2 Traffic
To apply a logical interface policer to Layer 2 traffic, include the layer2-policer input-policer policer-name statement or the layer2-policer output-policer policer-name statement to a supported logical interface. Use the input-policer or output-policer statements to apply a two-color policer at Layer 2.
interfaces {
(ge-fpc/pic/port | xe-fpc/pic/port) {
unit unit-number {
layer2-policer {
input-policer policer-name;
output-policer policer-name;
}
}
}
}
You can include the configuration at the following hierarchy levels:
[edit][edit logical-systems logical-system-name]
See Also
Three-Color Policing at Layer 2 Overview
- Guidelines for Configuring Three-Color Policing of Layer 2 Traffic
- Statement Hierarchy for Configuring a Three-Color Policer for Layer 2 Traffic
- Statement Hierarchy for Applying a Three-Color Policer to Layer 2 Traffic
Guidelines for Configuring Three-Color Policing of Layer 2 Traffic
The following guidelines apply to three-color policing of Layer 2 traffic:
You can apply a three-color policer to Layer 2 traffic at a logical interface hosted on a Gigabit Ethernet interface (
ge-) or a 10-Gigabit Ethernet interface (xe-) only.A single logical interface supports Layer 2 policing in both directions.
You can apply a three-color policer to Layer 2 traffic as a logical interface policer only. You cannot apply a two-color policer to Layer 2 traffic as a stateless firewall filter action.
You can apply a three-color policer to Layer 2 traffic by referencing the policer in the interface configuration at the logical unit level, and not at the protocol level.
You can apply a color-aware three-color policer to Layer 2 traffic in the egress direction only, but you apply a color-blind three-color policer to Layer 2 traffic in either direction.
For information about configuring two-color policing of Layer 2 traffic, see Two-Color Policing at Layer 2 Overview.
Statement Hierarchy for Configuring a Three-Color Policer for Layer 2 Traffic
To enable a single-rate or two-rate three-color policer to rate-limit Layer 2 traffic, include the logical-interface-policer statement in the three-color-policer configuration.
firewall {
three-color-policer policer-name {
action {
loss-priority high then discard;
}
logical-interface-policer;
single-rate {
(color-aware | color-blind);
committed-burst-size bytes;
committed-information-rate bps;
excess-burst-size bytes;
}
two-rate {
(color-aware | color-blind);
committed-burst-size bytes;
committed-information-rate bps;
peak-burst-size bytes;
peak-information-rate bps;
}
}
}
You can include the configuration at the following hierarchy levels:
[edit][edit logical-systems logical-system-name]
Statement Hierarchy for Applying a Three-Color Policer to Layer 2 Traffic
To apply a logical interface policer to Layer 2 traffic, include the layer2-policer statement for a supported logical interface at the logical unit level. Use the input-three-color policer-name statement or output-three-color policer-name statement to specify the direction of the traffic to be policed.
interfaces {
(ge-fpc/pic/port | xe-fpc/pic/port) {
unit unit-number {
layer2-policer {
input-three-color policer-name;
output-three-color policer-name;
}
}
}
}
You can include the configuration at the following hierarchy levels:
[edit][edit logical-systems logical-system-name]
See Also
Example: Configuring a Three-Color Logical Interface (Aggregate) Policer
This example shows how to configure a two-rate three-color color-blind policer as a logical interface (aggregate) policer and apply the policer directly to Layer 2 input traffic at a supported logical interface.
Requirements
Before you begin, make sure that the logical
interface to which you apply the three-color logical interface policer
is hosted on a Gigabit Ethernet interface (ge-) or a 10-Gigabit
Ethernet interface (xe-) on an MX Series router.
Overview
A two-rate three-color policer meters a traffic flow against a bandwidth limit and burst-size limit for guaranteed traffic, plus a second set of bandwidth and burst-size limits for peak traffic. Traffic that conforms to the limits for guaranteed traffic is categorized as green, and nonconforming traffic falls into one of two categories:
Nonconforming traffic that does not exceed the bandwidth and burst-size limits for peak traffic is categorized as yellow.
Nonconforming traffic that exceeds the bandwidth and burst-size limits for peak traffic is categorized as red.
A logical interface policer defines traffic rate-limiting rules that you can apply to multiple protocol families on the same logical interface without creating multiple instances of the policer.
You apply a logical interface policer directly to a logical interface at the logical unit level, and not by referencing the policer in a stateless firewall filter and then applying the filter to the logical interface at the protocol family level.
Topology
In this example, you configure the two-rate three-color policer trTCM2-cb as a color-blind logical interface policer and apply
the policer to incoming Layer 2 traffic on logical interface ge-1/3/1.0.
When using a three-color policer to rate-limit Layer 2 traffic, color-aware policing can be applied to egress traffic only.
The policer defines guaranteed traffic rate limits such that
traffic that conforms to the bandwidth limit of 40 Mbps with
a 100 KB allowance for traffic bursting (based on the token-bucket
formula) is categorized as green. As with any policed traffic, the
packets in a green flow are implicitly set to a low loss
priority and then transmitted.
Nonconforming traffic that falls within the peak traffic limits
of a 60 Mbps bandwidth limit and a 200 KB allowance for
traffic bursting (based on the token-bucket formula) is categorized
as yellow. The packets in a yellow traffic flow are implicitly set
to a medium-high loss priority and then transmitted.
Nonconforming traffic that exceeds the peak traffic limits are
categorized as red. The packets in a red traffic flow are implicitly
set to a high loss priority. In this example, the optional
policer action for red traffic (loss-priority high then discard) is configured, so packets in a red traffic flow are discarded instead
of transmitted.
Configuration
The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Use the CLI Editor in Configuration Mode.
To configure this example, perform the following tasks:
- CLI Quick Configuration
- Configuring the Logical Interfaces
- Configuring the Two-Rate Three-Color Policer as a Logical Interface Policer
- Applying the Three-Color Policer to the Layer 2 Input at the Logical Interface
CLI Quick Configuration
To quickly configure this example, copy the following
configuration commands into a text file, remove any line breaks, and
then paste the commands into the CLI at the [edit] hierarchy
level.
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 three-color-policer trTCM2-cb logical-interface-policer set firewall three-color-policer trTCM2-cb two-rate color-blind set firewall three-color-policer trTCM2-cb two-rate committed-information-rate 40m set firewall three-color-policer trTCM2-cb two-rate committed-burst-size 100k set firewall three-color-policer trTCM2-cb two-rate peak-information-rate 60m set firewall three-color-policer trTCM2-cb two-rate peak-burst-size 200k set firewall three-color-policer trTCM2-cb action loss-priority high then discard set interfaces ge-1/3/1 unit 0 layer2-policer input-three-color trTCM2-cb
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 Two-Rate Three-Color Policer as a Logical Interface Policer
Step-by-Step Procedure
To configure the two-rate three-color policer as a logical interface policer:
Enable configuration of a three-color policer.
[edit] user@host# edit firewall three-color-policer trTCM2-cb
Specify that the policer is a logical interface (aggregate) policer.
[edit firewall three-color-policer trTCM2-cb] 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, and the policer is applied directly to the interface rather than referenced by a firewall filter.
Specify that the policer is two-rate and color-blind.
[edit firewall three-color-policer trTCM2-cb] user@host# set two-rate color-blind
A color-aware three-color policer takes into account any coloring markings that might have been set for a packet by another traffic policer configured at a previous network node, and any preexisting color markings are used in determining the appropriate policing action for the packet.
Because you are applying this three-color policer applied to input at Layer 2, you must configure the policer to be color-blind.
Specify the policer traffic limits used to classify a green traffic flow.
[edit firewall three-color-policer trTCM2-cb] user@host# set two-rate committed-information-rate 40m user@host# set two-rate committed-burst-size 100k
Specify the additional policer traffic limits used to classify a yellow or red traffic flow.
[edit firewall three-color-policer trTCM2-cb] user@host# set two-rate peak-information-rate 60m user@host# set two-rate peak-burst-size 200k
(Optional) Specify the configured policer action for packets in a red traffic flow.
[edit firewall three-color-policer trTCM2-cb] user@host# set action loss-priority high then discard
In color-aware mode, the three-color policer configured action can increase the packet loss priority (PLP) level of a packet, but never decrease it. For example, if a color-aware three-color policer meters a packet with a medium PLP marking, it can raise the PLP level to high, but cannot reduce the PLP level to low.
Results
Confirm the configuration of the three-color 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
three-color-policer trTCM2-cb {
logical-interface-policer;
action {
loss-priority high then discard;
}
two-rate {
color-blind;
committed-information-rate 40m;
committed-burst-size 100k;
peak-information-rate 60m;
peak-burst-size 200k;
}
}
Applying the Three-Color Policer to the Layer 2 Input at the Logical Interface
Step-by-Step Procedure
To apply the three-color policer to the Layer 2 input at the logical interface:
Enable application of Layer 2 logical interface policers.
[edit] user@host# edit interfaces ge-1/3/1 unit 0
Apply the three-color logical interface policer to a logical interface input.
[edit interfaces ge-1/3/1 unit 0] user@host# set layer2-policerinput-three-color trTCM2-cb
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;
layer2-policer {
input-three-color trTCM2-cb;
}
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;
}
}
}
}
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 evaluated when packets are 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,
and the Protocol inet section contains
a Policer field that would list the policer trTCM2-cb as an input or output policer as follows:
Input: trTCM2-cb-ge-1/3/1.0-log_int-i
Output: trTCM2-cb-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 in the input direction 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 trTCM2-cb, the input and output policer
names are displayed as follows:
trTCM2-cb-ge-1/3/1.0-log_int-i
trTCM2-cb-e-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.