H3C Fixed Port Campus Switches Configuration Examples-B70D022-6W100

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59-Congestion Avoidance and Queue Scheduling Configuration Examples

Introduction

This document provides examples for configuring congestion avoidance and queue scheduling profiles.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of congestion avoidance and queue scheduling profiles.

Example: Configuring congestion avoidance and queue scheduling

Network configuration

As shown in Figure 1, three types of traffic come from the Internet to the device through the gateway.

·     Voice trafficTransmitted in VLAN 6 and carries 802.1p priority 6.

·     Video trafficTransmitted in VLAN 4 and carries 802.1p priority 4.

·     Data trafficTransmitted in VLAN 2 and carries 802.1p priority 2.

Configure congestion avoidance and queue scheduling on the device to meet the following requirements:

·     The voice traffic, video traffic, and data traffic are scheduled in the ratio of 1:2:2 when congestion occurs.

·     WRED drop is used when serious congestion occurs.

Figure 1 Network diagram

 

Analysis

To configure congestion avoidance and queue scheduling, you must perform the following tasks:

·     To assign different types of traffic to different queues, configure the inbound interface to trust the 802.1p priority in packets.

·     To schedule the three types of traffic in the ratio of 1:2:2, assign their queues to one WRR group and configure weights for these queues.

·     To minimize performance degradation for different types of traffic, use the drop parameters in Table 1.

Table 1 Drop parameters

Traffic type

Packet color

Lower limit

Upper limit

Drop probability

Voice

Yellow

1000

1500

3%

Red

500

1000

30%

Video

Yellow

1000

1500

2%

Red

500

1000

20%

Data

Yellow

1000

1500

1%

Red

500

1000

10%

 

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

 

Hardware

Software version

S6520XE-HI switch series

Supported in Release 11xx

S5560X-EI switch series

Not supported

S5500V2-EI switch series

Not supported

MS4520V2-30F switch

Not supported

S5560S-EI switch series

S5560S-SI switch series

Not supported

S5130S-HI switch series

S5130S-EI switch series

S5130S-SI switch series

S5130S-LI switch series

Not supported

S5120V2-SI switch series

S5120V2-LI switch series

Not supported

S3100V3-EI switch series

S3100V3-SI switch series

Not supported

S5110V2 switch series

Not supported

S5110V2-SI switch series

Not supported

S5000V3-EI switch series

Not supported

S5000E-X switch series

Not supported

WAS6000 switch series

Not supported

E128C switch

E152C switch

E500C switch series

E500D switch series

Not supported

MS4520V2 switch series (except the MS4520V2-30F switch)

Not supported

MS4320V2 switch series

MS4300V2 switch series

MS4320 switch series

MS4200 switch series

Not supported

WS5850-WiNet switch series

Not supported

WS5820-WiNet switch series

WS5810-WiNet switch series

Not supported

 

Procedures

1.     Allow VLANs for different types of traffic to pass through:

# Create three VLANs .

<Device> system-view

[Device] vlan 2

[Device-vlan2] quit

[Device] vlan 4

[Device-vlan4] quit

[Device] vlan 6

[Device-vlan6] quit

# Assign interfaces to VLANs.

[Device] interface ten-gigabitEthernet 1/0/21

[Device-Ten-GigabitEthernet1/0/21] port link-type trunk

[Device-Ten-GigabitEthernet1/0/21] port trunk permit vlan 2 4 6

[Device-Ten-GigabitEthernet1/0/21] quit

[Device] interface gigabitethernet 1/0/1

[Device-GigabitEthernet1/0/1] port link-type trunk

[Device-GigabitEthernet1/0/1] port trunk permit vlan 2 4 6

[Device-GigabitEthernet1/0/1] quit

[Device] interface gigabitethernet 1/0/2

[Device-GigabitEthernet1/0/2] port link-type trunk

[Device-GigabitEthernet1/0/2] port trunk permit vlan 2 4 6

[Device-GigabitEthernet1/0/2] quit

2.     Configure interface Ten-GigabitEthernet 1/0/21 to trust the 802.1p priority in packets.

[Device] interface ten-gigabitEthernet 1/0/21

[Device-Ten-GigabitEthernet1/0/21] qos trust dot1p

[Device-Ten-GigabitEthernet1/0/21] quit

3.     Configure WRR on GigabitEthernet 1/0//1 and GigabitEthernet 1/0//2:

# Display the 802.1p-to-local precedence map to determine the local precedence for each type of traffic.

[Device] display qos map-table inbound dot1p-lp

MAP-TABLE NAME: dot1p-lp   TYPE: pre-define

IMPORT  :  EXPORT

   0    :    2

   1    :    0

   2    :    1

   3    :    3

   4    :    4

   5    :    5

   6    :    6

   7    :    7

# Enable weight-based WRR on GigabitEthernet 1/0/1.

[Device] interface gigabitethernet 1/0/1

[Device-GigabitEthernet1/0/1] qos wrr weight

# Configure the weights of queue 1 (for data traffic), queue 4 (for video traffic), and queue 6 (for voice traffic) as 2, 2, and 1, respectively.

[Device-GigabitEthernet1/0/1] qos wrr 1 group 1 weight 2

[Device-GigabitEthernet1/0/1] qos wrr 4 group 1 weight 2

[Device-GigabitEthernet1/0/1] qos wrr 6 group 1 weight 1

[Device-GigabitEthernet1/0/1] quit

# Enable weight-based WRR on GigabitEthernet 1/0/2.

[Device] interface gigabitethernet 1/0/2

[Device-GigabitEthernet1/0/2] qos wrr weight

# Configure the weights of queue 1 (for data traffic), queue 4 (for video traffic), and queue 6 (for voice traffic) as 2, 2, and 1, respectively.

[Device-GigabitEthernet1/0/2] qos wrr 1 group 1 weight 2

[Device-GigabitEthernet1/0/2] qos wrr 4 group 1 weight 2

[Device-GigabitEthernet1/0/2] qos wrr 6 group 1 weight 1

[Device-GigabitEthernet1/0/2] quit

4.     Configure congestion avoidance:

# Configure a WRED table.

[Device] qos wred queue table droppolicy

[Device-wred-table-droppolicy] queue 6 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 3

[Device-wred-table-droppolicy] queue 6 drop-level 2 low-limit 500 high-limit 1000 discard-probability 30

[Device-wred-table-droppolicy] queue 4 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 2

[Device-wred-table-droppolicy] queue 4 drop-level 2 low-limit 500 high-limit 1000 discard-probability 20

[Device-wred-table-droppolicy] queue 1 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 1

[Device-wred-table-droppolicy] queue 1 drop-level 2 low-limit 500 high-limit 1000 discard-probability 10

[Device-wred-table-droppolicy] quit

# Apply the WRED table to interfaces GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2.

[Device] interface gigabitethernet 1/0/1

[Device-GigabitEthernet1/0/1] qos wred apply droppolicy

[Device-GigabitEthernet1/0/1] quit

[Device] interface gigabitethernet 1/0/2

[Device-GigabitEthernet1/0/2] qos wred apply droppolicy

[Device-GigabitEthernet1/0/2] quit

Verifying the configuration

# Verify the WRR configuration on interfaces GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2.

[Device] display qos queue wrr interface

Interface: GigabitEthernet1/0/1

 Output queue: Weighted Round Robin queuing

 Queue ID     Queue name     Group     Weight

 ---------------------------------------------------

 0            be             1         1

 1            af1            1         2

 2            af2            1         3

 3            af3            1         4

 4            af4            1         2

 5            ef             1         9

 6            cs6            1         1

 7            cs7            1         15

Interface: GigabitEthernet1/0/2

 Output queue: Weighted Round Robin queuing

 Queue ID     Queue name     Group     Weight

 ---------------------------------------------------

 0            be             1         1

 1            af1            1         2

 2            af2            1         3

 3            af3            1         4

 4            af4            1         2

 5            ef             1         9

 6            cs6            1         1

 7            cs7            1         15

# Display the WRED table configuration.

Table name: droppolicy                                                         

Table type: Queue based WRED                                                   

QID   gmin  gmax  gprob  ymin  ymax  yprob  rmin  rmax  rprob  exponent  ECN   

----------------------------------------------------------------------------   

0     100   1000  10     100   1000  10     100   1000  10     9         N     

1     100   1000  10     1000  1500  1      500   1000  10     9         N     

2     100   1000  10     100   1000  10     100   1000  10     9         N     

3     100   1000  10     100   1000  10     100   1000  10     9         N     

4     100   1000  10     1000  1500  2      500   1000  20     9         N     

5     100   1000  10     100   1000  10     100   1000  10     9         N     

6     100   1000  10     1000  1500  3      500   1000  30     9         N     

7     100   1000  10     100   1000  10     100   1000  10     9         N    

Configuration files

#

vlan 1

#

vlan 2

#

vlan 4

#

vlan 6

#

qos wred queue table droppolicy

 queue 1 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 1

 queue 1 drop-level 2 low-limit 500 high-limit 1000 discard-probability 10

 queue 4 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 2

 queue 4 drop-level 2 low-limit 500 high-limit 1000 discard-probability 20

 queue 6 drop-level 1 low-limit 1000 high-limit 1500 discard-probability 3

 queue 6 drop-level 2 low-limit 500 high-limit 1000 discard-probability 30

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan 1 to 2 4 6

 qos wrr weight

 qos wrr af1 group 1 weight 2

 qos wrr af4 group 1 weight 2

 qos wrr cs6 group 1 weight 1

 qos wred apply droppolicy

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan 1 to 2 4 6

 qos wrr weight

 qos wrr af1 group 1 weight 2

 qos wrr af4 group 1 weight 2

 qos wrr cs6 group 1 weight 1

 qos wred apply droppolicy

#

interface GigabitEthernet1/0/21

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan 1 to 2 4 6

#

return

 

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