- Table of Contents
-
- H3C S12500X-AF & S12500-X & S9800 Switch Series Configuration Examples-Release 27xx-6W100
- 00-Preface
- 01-CLI configuration
- 02-RBAC configuration
- 03-Login management configuration
- 04-FTP and TFTP configuration
- 05-File system management configuration
- 06-Configuration file management configuration
- 07-Software upgrade configuration
- 08-Emergency shell configuration
- 09-Automatic configuration
- 10-Device management configuration
- 11-Tcl configuration
- 12-Python configuration
- 13-License management
- Related Documents
-
Title | Size | Download |
---|---|---|
53-Congestion Avoidance and Queue Scheduling Configuration Examples | 93.37 KB |
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H3C S12500X-AF & S12500-X & S9800 |
Congestion Avoidance and Queue Scheduling Configuration Examples |
|
S12500X-AF Switch Series
S12500-X Switch Series
S9800 Switch Series
Document version: 6W100-20190628
Copyright © 2019 New H3C Technologies Co., Ltd. All rights reserved.
No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New H3C Technologies Co., Ltd.
Except for the trademarks of New H3C Technologies Co., Ltd., any trademarks that may be mentioned in this document are the property of their respective owners.
The information in this document is subject to change without notice.
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 traffic—Transmitted in VLAN 6 and carries 802.1p priority 6.
· Video traffic—Transmitted in VLAN 4 and carries 802.1p priority 4.
· Data traffic—Transmitted 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.
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.
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% |
Software versions used
Table 2 shows the software versions used in this configuration example.
Table 2 Product and software version compatibility
Product |
Software version |
S12500X-AF Switch Series |
S12500X-CMW710-R2712 |
S12500-X Switch Series |
S12500X-CMW710-R2712 |
S9800 Switch Series |
S9800-CMW710-R2712 |
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 hundredgige 3/0/1
[Device-HundredGigE3/0/1] port link-type trunk
[Device-HundredGigE3/0/1] port trunk permit vlan 2 4 6
[Device-HundredGigE3/0/1] quit
[Device] interface ten-gigabitethernet 3/0/3
[Device-Ten-GigabitEthernet3/0/3] port link-type trunk
[Device-Ten-GigabitEthernet3/0/3] port trunk permit vlan 2 4 6
[Device-Ten-GigabitEthernet3/0/3] quit
[Device] interface ten-gigabitethernet 3/0/4
[Device-Ten-GigabitEthernet3/0/4] port link-type trunk
[Device-Ten-GigabitEthernet3/0/4] port trunk permit vlan 2 4 6
[Device-Ten-GigabitEthernet3/0/4] quit
2. Configure interface HundredGigE 3/0/1 to trust the 802.1p priority in packets.
[Device] interface hundredgige 3/0/1
[Device-HundredGigE3/0/1] qos trust dot1p
[Device-HundredGigE3/0/1] quit
3. Configure WRR:
# 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 Ten-GigabitEthernet 3/0/3.
[Device] interface ten-gigabitethernet 3/0/3
[Device-Ten-GigabitEthernet3/0/3] 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-Ten-GigabitEthernet3/0/3] qos wrr 1 group 1 weight 2
[Device-Ten-GigabitEthernet3/0/3] qos wrr 4 group 1 weight 2
[Device-Ten-GigabitEthernet3/0/3] qos wrr 6 group 1 weight 1
[Device-Ten-GigabitEthernet3/0/3] quit
# Enable weight-based WRR on Ten-GigabitEthernet 3/0/4.
[Device] interface ten-gigabitethernet 3/0/4
[Device-Ten-GigabitEthernet3/0/4] 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-Ten-GigabitEthernet3/0/4] qos wrr 1 group 1 weight 2
[Device-Ten-GigabitEthernet3/0/4] qos wrr 4 group 1 weight 2
[Device-Ten-GigabitEthernet3/0/4] qos wrr 6 group 1 weight 1
[Device-Ten-GigabitEthernet3/0/4] 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 Ten-GigabitEthernet 3/0/3 and Ten-GigabitEthernet 3/0/4.
[Device] interface ten-gigabitethernet 3/0/3
[Device-Ten-GigabitEthernet3/0/3] qos wred apply droppolicy
[Device-Ten-GigabitEthernet3/0/3] quit
[Device] interface ten-gigabitethernet 3/0/4
[Device-Ten-GigabitEthernet3/0/4] qos wred apply droppolicy
[Device-Ten-GigabitEthernet3/0/4] quit
Verifying the configuration
# Verify the WRR configuration on interfaces Ten-GigabitEthernet 3/0/3 and Ten-GigabitEthernet 3/0/4.
[Device] display qos queue wrr interface
Interface: Ten-GigabitEthernet3/0/3
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 6
6 cs6 1 1
7 cs7 1 8
Interface: Ten-GigabitEthernet3/0/4
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 6
6 cs6 1 1
7 cs7 1 8
# 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 Ten-GigabitEthernet3/0/3
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 Ten-GigabitEthernet3/0/4
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 HundredGigE3/0/1
port link-mode bridge
port link-type trunk
port trunk permit vlan 1 to 2 4 6
#
return
Related documentation
· H3C S12500X-AF & S12500-X & S9800 Switch Series ACL and QoS Command Reference (R27xx)
· H3C S12500X-AF & S12500-X & S9800 Switch Series ACL and QoS Configuration Guide (R27xx)