Example for Configuring CTC-based Traffic Policies for VLAN Packets

This part is an example for configuring and applying priority mapping rules.

Networking Requirements

As shown in Figure 1, DeviceA and DeviceB connect to each other through a VLAN. When IP packets sent by DeviceA enter the VLAN, by default, the precedence of these IP packets is mapped to the 802.1p value. When these IP packets (carrying VLAN frame priority) leave the VLAN and arrive at DeviceB, the VLAN frame priority is mapped to the IP precedence according to the configuration on DeviceB. Then, these packets are forwarded according to their IP precedence.

Interfaces 1 through 3 in this example are GE 0/1/0, GE 0/1/8.1, GE 0/1/16, respectively.

Figure 1 Networking diagram for configuring VLAN QoS

Configuration Notes

When configuring VLAN QoS, pay attention to the following:

The statistical function of traffic policies is disabled by default. To display the statistics about a traffic policy, you can enable statistics for the traffic policy by running the statistics enable command.

Configuration Roadmap

The configuration roadmap is as follows:

Configure the VLAN and routes on DeviceA and DeviceB.
Configure QoS policies on DeviceB.

Data Preparation

To complete the configuration, you need the following data:

Names of traffic classification, traffic behaviors, and traffic policies
Preferences for re-marking

Procedure

Define a classifier to match packets whose 802.1p value is 2.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] traffic classifier test
[*DeviceB-classifier-test] if-match 8021p 2
[*DeviceB-classifier-test] commit
[~DeviceB-classifier-test] quit

Define a traffic behavior to re-mark the IP precedence of packets as 4.

[~DeviceB] traffic behavior test
[*DeviceB-behavior-test] remark ip-precedence 4
[*DeviceB-behavior-test] commit
[~DeviceB-behavior-test] quit

Define a QoS policy to associate a configured traffic behavior with a specified traffic classifier.

[~DeviceB] traffic policy test
[*DeviceB-trafficpolicy-test] classifier test behavior test
[*DeviceB-trafficpolicy-test] commit
[~DeviceB-trafficpolicy-test] quit

Apply the QoS policy to the incoming traffic of GE 0/1/8.1 on DeviceB.

[~DeviceB] interface Gigabitethernet 0/1/8.1
[*DeviceB-Gigabitethernet0/1/8.1] traffic-policy test inbound link-layer
[*DeviceB-Gigabitethernet0/1/8.1] commit
[~DeviceB-Gigabitethernet0/1/8.1] quit

Verify the configuration.
After the preceding configurations, when packets whose IP precedence is 2 are forwarded by GE0/1/0.1 on DeviceA reach the VLAN, the IP precedence 2 is mapped to the VLAN priority 2. After these VLAN frames reach DeviceB, DeviceB forwards these VLAN frames as IP packets with the IP precedence of 4 to the network segment 10.1.2.0/24.

Configuration File

Configuration file of DeviceB

#
 sysname DeviceB
#
traffic classifier test operator or
 if-match 8021p 2
#
traffic behavior test
 remark ip-precedence 4
#
traffic policy test
 classifier test behavior test precedence 1
#
interface GigabitEthernet0/1/8.1
 traffic-policy test inbound link-layer
# 
return