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S600-E V200R010C00 Configuration Guide - QoS

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, and ACL-based simplified traffic policy.

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Example for Configuring Priority Mapping

Example for Configuring Priority Mapping

Networking Requirements

As shown in Figure 3-4, SwitchA and SwitchB are connected to the router, and enterprise branches 1 and 2 can access the network through LSW1 and LSW2. Enterprise branch 1 requires better QoS guarantee, so DSCP priorities of data packets from enterprise branches 1 and 2 are mapped to 45 and 30 respectively. The Switch trusts DSCP priorities of packets. When congestion occurs, the Switch first processes packets of higher DSCP priority.

Figure 3-4  Networking diagram of priority mapping

Configuration Roadmap

The configuration roadmap is as follows:
  1. Create VLANs and configure interfaces so that the enterprise can access the network.
  2. Configure priority mapping to map DSCP priorities of data packets from enterprise branches 1 and 2 to 45 and 30 respectively.

Procedure

  1. Configure SwitchA.

    # Create VLAN 100.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 100

    # Set the link type of GE 0/0/1 and GE 0/0/2 to trunk and add them to VLAN 100.

    [SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type trunk
[SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 100
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type trunk
[SwitchA-GigabitEthernet0/0/2] port trunk allow-pass vlan 100
[SwitchA-GigabitEthernet0/0/2] quit

    # Configure interfaces to trust DSCP priorities of packets.

    [SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] trust dscp
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] trust dscp
[SwitchA-GigabitEthernet0/0/2] quit

    # Configure priority mapping.

    [SwitchA] qos map-table dscp-dscp
[SwitchA-dscp-dscp] input 0 to 63 output 45 
[SwitchA-dscp-dscp] quit

  2. Configure SwitchB.

    # Create VLAN 200.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan batch 200

    # Set the link type of GE 0/0/1 and GE 0/0/2 to trunk and add them to VLAN 200.

    [SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type trunk
[SwitchB-GigabitEthernet0/0/1] port trunk allow-pass vlan 200
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] port link-type trunk
[SwitchB-GigabitEthernet0/0/2] port trunk allow-pass vlan 200
[SwitchB-GigabitEthernet0/0/2] quit

    # Configure interfaces to trust DSCP priorities of packets.

    [SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] trust dscp
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] trust dscp
[SwitchB-GigabitEthernet0/0/2] quit

    # Configure priority mapping.

    [SwitchB] qos map-table dscp-dscp
[SwitchB-dscp-dscp] input 0 to 63 output 30 
[SwitchB-dscp-dscp] quit

  3. Verify the configuration.

    # View priority mapping information on SwitchA.

    [SwitchA] display qos map-table dscp-dscp
Input DSCP       DSCP
------------------------
0                45
1                45
2                45
3                45
4                45
......
63               45

    # View the interface configuration on SwitchA.

    [SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] display this
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 100
 trust dscp
#                                                                               
return   
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] display this
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 100
 trust dscp
#                                                                               
return

    # View priority mapping information on SwitchB.

    [SwitchB] display qos map-table dscp-dscp
Input DSCP       DSCP
------------------------
0                30
1                30
2                30
3                30
4                30
......
63               30

    # View the interface configuration on SwitchB.

    [SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] display this
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 200
 trust dscp
#                                                                               
return   
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] display this
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 200
 trust dscp
#                                                                               
return

Configuration Files

  • SwitchA configuration file
    #
sysname SwitchA
#
vlan batch 100
# 
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 100
 trust dscp
# 
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 100
 trust dscp
#
qos map-table dscp-dscp
  input 0 to 44 output 45
  input 46 to 63 output 45
#                                                                               
return
  • SwitchB configuration file
    #
sysname SwitchB
#
vlan batch 200
# 
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 200
 trust dscp
# 
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 200
 trust dscp
#
qos map-table dscp-dscp
  input 0 to 29 output 30
  input 31 to 63 output 30
#                                                                               
return
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Updated: 2020-12-26

Document ID: EDOC1000141882

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