Huawei quidway s7700 User manual

Quidway S7700 Smart Routing Switch
V100R006C00
Configuration Guide - QoS
Issue 01
Date 2011-07-15
HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective holders.
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Huawei Technologies Co., Ltd.
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About This Document
Intended Audience
This document provides the basic concepts, configuration procedures, and configuration
examples in different application scenarios of the QoS supported by the S7700.
This document describes how to configure the QoS.
This document is intended for:
lData configuration engineers
lCommissioning engineers
lNetwork monitoring engineers
lSystem maintenance engineers
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
DANGER
Indicates a hazard with a high level of risk, which if not
avoided, will result in death or serious injury.
WARNING
Indicates a hazard with a medium or low level of risk, which
if not avoided, could result in minor or moderate injury.
CAUTION
Indicates a potentially hazardous situation, which if not
avoided, could result in equipment damage, data loss,
performance degradation, or unexpected results.
TIP
Indicates a tip that may help you solve a problem or save
time.
NOTE
Provides additional information to emphasize or supplement
important points of the main text.
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Command Conventions
The command conventions that may be found in this document are defined as follows.
Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italics.
[ ] Items (keywords or arguments) in brackets [ ] are optional.
{ x | y | ... } Optional items are grouped in braces and separated by
vertical bars. One item is selected.
[ x | y | ... ] Optional items are grouped in brackets and separated by
vertical bars. One item is selected or no item is selected.
{ x | y | ... }*Optional items are grouped in braces and separated by
vertical bars. A minimum of one item or a maximum of all
items can be selected.
[ x | y | ... ]*Optional items are grouped in brackets and separated by
vertical bars. Several items or no item can be selected.
&<1-n> The parameter before the & sign can be repeated 1 to n times.
# A line starting with the # sign is comments.
Change History
Updates between document issues are cumulative. Therefore, the latest document issue contains
all updates made in previous issues.
Changes in Issue 01 (2011-07-15)
Initial commercial release.
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Contents
About This Document.....................................................................................................................ii
1 Class-based QoS Configuration.................................................................................................1
1.1 Introduction to Class-based QoS........................................................................................................................2
1.2 Class-based QoS Features Supported by the S7700...........................................................................................2
1.3 Configuring Priority Mapping Based on Simple Traffic Classification.............................................................6
1.3.1 Establishing the Configuration Task.........................................................................................................6
1.3.2 Configuring an Interface to Trust the Priority of Packets..........................................................................7
1.3.3 (Optional) Setting the Default 802.1p Priority of an Interface..................................................................8
1.3.4 Creating a DiffServ Domain and Configuring Priority Mapping..............................................................9
1.3.5 Applying a DiffServ Domain..................................................................................................................10
1.3.6 Checking the Configuration.....................................................................................................................12
1.4 Creating a Traffic Policy Based on Complex Traffic Classification................................................................12
1.4.1 Establishing the Configuration Task.......................................................................................................12
1.4.2 Configuring Complex Traffic Classification...........................................................................................13
1.4.3 Configuring a Traffic Behavior...............................................................................................................20
1.4.4 Configuring a Traffic Policy....................................................................................................................28
1.4.5 Applying the Traffic Policy.....................................................................................................................28
1.4.6 Checking the Configuration.....................................................................................................................30
1.5 Maintaining Class-based QoS..........................................................................................................................31
1.5.1 Displaying the Flow-based Traffic Statistics...........................................................................................31
1.5.2 Clearing the Flow-based Traffic Statistics..............................................................................................31
1.6 Configuration Examples...................................................................................................................................32
1.6.1 Example for Configuring Priority Mapping Based on Simple Traffic Classification.............................32
1.6.2 Example for Re-marking the Priorities Based on Complex Traffic Classification.................................34
1.6.3 Example for Configuring Policy-based Routing.....................................................................................38
1.6.4 Example for Configuring Traffic Statistics Based on Complex Traffic Classification...........................42
2 Traffic Policing and Traffic Shaping Configuration............................................................46
2.1 Overview of Traffic Policing and Traffic Shaping...........................................................................................47
2.1.1 Traffic Policing........................................................................................................................................47
2.1.2 Traffic Shaping........................................................................................................................................49
2.2 Configuring Interface-based Traffic Policing...................................................................................................50
2.2.1 Establishing the Configuration Task.......................................................................................................50
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2.2.2 Limiting the Rate of Traffic on the Outbound Interface..........................................................................51
2.2.3 Configuring Rate Limit on the Management Interface............................................................................52
2.2.4 Checking the Configuration.....................................................................................................................53
2.3 Configuring Traffic Policing Based on a Traffic Classifier.............................................................................53
2.3.1 Establishing the Configuration Task.......................................................................................................53
2.3.2 Configuring Complex Traffic Classification...........................................................................................54
2.3.3 Configuring a Traffic Policing Action on the..........................................................................................54
2.3.4 Creating a Traffic Policy.........................................................................................................................56
2.3.5 Applying the Traffic Policy.....................................................................................................................56
2.3.6 Checking the Configuration.....................................................................................................................58
2.4 Configuring Traffic Shaping............................................................................................................................58
2.4.1 Establishing the Configuration Task.......................................................................................................58
2.4.2 Configuring Traffic Shaping on an Interface...........................................................................................59
2.4.3 (Optional) Setting the Length of the Interface Queue.............................................................................60
2.4.4 Configuring Traffic Shaping in an Interface Queue................................................................................61
2.4.5 Checking the Configuration.....................................................................................................................62
2.5 Maintaining Traffic Policing and Traffic Shaping...........................................................................................62
2.5.1 Displaying the Traffic Statistics..............................................................................................................62
2.5.2 Checking the Usage of the Queue...........................................................................................................63
2.5.3 Clearing the Traffic Statistics..................................................................................................................63
2.6 Configuration Examples...................................................................................................................................64
2.6.1 Example for Configuring Interface-based Traffic Policing.....................................................................64
2.6.2 Example for Configuring Traffic Policing Based on a Traffic Classifier...............................................67
2.6.3 Example for Configuring Traffic Shaping...............................................................................................72
3 Congestion Avoidance and Congestion Management Configuration..............................76
3.1 Overview of Congestion Avoidance and Congestion Management.................................................................77
3.1.1 Congestion Avoidance.............................................................................................................................77
3.1.2 Congestion Management.........................................................................................................................78
3.2 Configuring Congestion Avoidance.................................................................................................................79
3.2.1 Establishing the Configuration Task.......................................................................................................79
3.2.2 (Optional) Setting the Length of the Interface Queue.............................................................................80
3.2.3 (Optional) Configuring the CFI Field as the Internal Drop Priority........................................................80
3.2.4 Creating a WRED Drop Profile...............................................................................................................81
3.2.5 Applying the WRED Drop Profile..........................................................................................................82
3.2.6 Checking the Configuration.....................................................................................................................83
3.3 Configuring Congestion Management..............................................................................................................84
3.3.1 Establishing the Configuration Task.......................................................................................................84
3.3.2 (Optional) Setting the Length of the Interface Queue.............................................................................85
3.3.3 Setting the Scheduling Mode for an Interface Queue..............................................................................85
3.3.4 Checking the Configuration.....................................................................................................................86
3.4 Maintaining Congestion Avoidance and Congestion Management.................................................................87
3.4.1 Displaying the Queue-based Statistics....................................................................................................87
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3.4.2 Checking the Usage of the Queue...........................................................................................................87
3.4.3 Clearing the Queue-based Statistics........................................................................................................88
3.5 Configuration Examples...................................................................................................................................89
3.5.1 Example for Configuring Congestion Avoidance and Congestion Management...................................89
4 Traffic Distribution Configuration..........................................................................................94
4.1 Traffic Distribution Overview..........................................................................................................................95
4.2 Traffic Distribution Features Supported by the S7700.....................................................................................95
4.3 Configuring Traffic Distribution Based on the Eth-Trunk...............................................................................96
4.3.1 Establishing the Configuration Task.......................................................................................................96
4.3.2 Setting the Load Balancing Mode of an Eth-Trunk................................................................................97
4.3.3 (Optional) Configuring Unidirectional Single-fiber Communication.....................................................98
4.3.4 Configuring a Traffic Policy....................................................................................................................99
4.3.5 Checking the Configuration...................................................................................................................100
4.4 Configuring Traffic Distribution Based on ECMP.........................................................................................100
4.4.1 Establishing the Configuration Task.....................................................................................................100
4.4.2 Configuring Static Routes.....................................................................................................................101
4.4.3 Configuring ECMP................................................................................................................................102
4.4.4 (Optional) Retaining the Original TTL Value.......................................................................................103
4.4.5 Checking the Configuration...................................................................................................................103
4.5 Maintaining Traffic Distribution....................................................................................................................104
4.5.1 Displaying the Outbound Interface of Specified Packets......................................................................104
4.6 Configuration Examples.................................................................................................................................104
4.6.1 Example for Configuring Traffic Distribution Based on the Eth-Trunk...............................................104
4.6.2 Example for Configuring Traffic Distribution Based on ECMP...........................................................107
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1 Class-based QoS Configuration
About This Chapter
This chapter describes the basic concepts of the traffic classifier, traffic behavior, traffic
policy, DiffServ domain, and priority mapping, and configuration methods and configuration
examples of the traffic policy based on complex traffic classification and priority mapping based
on simple traffic classification.
1.1 Introduction to Class-based QoS
Class-based QoS is used to classify packets sharing common features into one class and provide
the same QoS service for traffic of the same type by matching packets with certain rules. In this
manner, differentiated services are provided.
1.2 Class-based QoS Features Supported by the S7700
The S7700 supports simple traffic classification, complex traffic classification, and priority
mapping.
1.3 Configuring Priority Mapping Based on Simple Traffic Classification
After priority mapping based on simple traffic classification is configured, the device maps
priorities of packets to PHBs and colors to provide differentiated services.
1.4 Creating a Traffic Policy Based on Complex Traffic Classification
After the traffic policy based on complex traffic classification is configured, the S7700 classifies
packets according to the priority of packets and quintuple information. Then the S7700 takes
different traffic actions for packets matching classification conditions, such as permit/deny, re-
marking, and redirection.
1.5 Maintaining Class-based QoS
If the traffic statistics function is enabled, you can view and clear the flow-based traffic statistics.
1.6 Configuration Examples
This section provides several configuration examples of class-based QoS.
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1.1 Introduction to Class-based QoS
Class-based QoS is used to classify packets sharing common features into one class and provide
the same QoS service for traffic of the same type by matching packets with certain rules. In this
manner, differentiated services are provided.
1.2 Class-based QoS Features Supported by the S7700
The S7700 supports simple traffic classification, complex traffic classification, and priority
mapping.
Simple Traffic Classification
On the S7700, you can perform simple traffic classification for packets based on the mappings
between priorities of packets and Per-Hop Behaviors (PHBs) defined in a Differentiated Services
(DiffServ) domain. If packets come from an upstream device, the S7700 binds a DiffServ domain
to the inbound interface. In the DiffServ domain, the S7700 maps priorities of packets to PHBs
and colors. On the S7700, congestion management is performed for packets based on PHBs of
packets and congestion avoidance is performed for packets based on colors of packets. If packets
are sent to a downstream device, the S7700 binds a DiffServ domain to the outbound interface.
In the DiffServ domain, the S7700 maps PHBs and colors of packets to priorities so that the
downstream device provides QoS services based on priorities of packets.
Simple traffic classification is based on:
l802.1p priority in VLAN packets
lDiffServ Code Point (DSCP) priority in IP packets
Complex Traffic Classification
Complex traffic classification is performed based on Layer 2 or Layer 3 information in packets
or by using access control lists (ACLs). You can bind a traffic classifier to a traffic behavior to
process packets matching the traffic classifier.
A traffic behavior is related to the current phase of packets and the current load of a network.
For example, when packets enter a node, the S7700 performs traffic policing and access control
for the packets based on the committed information rate (CIR). When packets leave a node, the
S7700 shapes the traffic of packets and re-marks the priorities of packets.
Complex traffic classification is based on:
l802.1p priority in VLAN packets
lVLAN ID in packets
l802.1p priority in CVLAN packets
lCVLAN ID in CVLAN packets
lDouble tags of VLAN packets
lInbound or outbound interface
lIP precedence in IP packets
lDSCP priority in IP packets
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lEXP priority in MPLS packets
lSYN Flag field in Transmission Control Protocol (TCP) packets
lSource MAC address
lDestination MAC address
lProtocol type field encapsulated in Layer 2 packets
lLayer 3 protocol type
lACL
lDiscarded packets
You can dynamically add, modify, or delete the matching rules of a traffic classifier on the
S7700.
Priority Mapping
Different packets carry different precedence fields. For example, VLAN packets carry the 802.1p
field, IP packets carry the DSCP field or IP precedence, and MPLS packets carry the EXP
field. The mappings between priority fields must be configured on gateways to retain priorities
of packets when the packets traverse different networks.
To ensure QoS for different packets, when packets reach the S7700, the S7700 maps priorities
in packets or the default 802.1p priority of an interface to local priorities. The S7700 then
determines the queues that packets enter based on the mappings between internal priorities and
queues and performs traffic shaping, congestion avoidance, and queue scheduling. In addition,
the S7700 can re-mark priorities of outgoing packets so that the downstream device can provide
differentiated QoS based on packet priorities.
Table 1-1 and Table 1-2 show the mappings between internal priorities and queues.
Table 1-1 Mappings between internal priorities and queues on the X40SFC
Internal Priority Queue Index
BE (unknown unicast packets, broadcast
packets, and multicast packets)
0
AF1 (unknown unicast packets, broadcast
packets, and multicast packets)
1
AF2 (unknown unicast packets, broadcast
packets, and multicast packets)
1
AF3 (unknown unicast packets, broadcast
packets, and multicast packets)
1
AF4 (unknown unicast packets, broadcast
packets, and multicast packets)
2
EF (unknown unicast packets, broadcast
packets, and multicast packets)
2
CS6 (unknown unicast packets, broadcast
packets, and multicast packets)
6
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Internal Priority Queue Index
CS7 (unknown unicast packets, broadcast
packets, and multicast packets)
6
BE (known unicast packets) 0
AF1 (known unicast packets) 1
AF2 (known unicast packets) 2
AF3 (known unicast packets) 3
AF4 (known unicast packets) 4
EF (known unicast packets) 5
CS6 (known unicast packets) 6
CS7 (known unicast packets) 7
Table 1-2 Mappings between internal priorities and queues on other boards
Internal Priority Queue Index
BE 0
AF1 1
AF2 2
AF3 3
AF4 4
EF 5
CS6 6
CS7 7
NOTE
A color is used to determine whether the packets are discarded, and is independent of the mappings between
internal priorities and queues.
You can dynamically modify priority mappings on the S7700.
Traffic Behavior
To provide differentiated services, perform complex traffic classification. Complex traffic
classification takes effect only when it is associated with a traffic control action or a resource
allocation action.
The S7700 supports the combinations of the following traffic actions:
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lDeny/Permit
The permit/deny action is the simplest traffic control action. The S7700 controls network
traffic by forwarding or discarding packets.
lRe-marking
This traffic control action is used to set the precedence field in a packet. Packets carry
different precedence fields on various networks. For example, packets carry the 802.1p
field in a VLANthe ToS field on an IP network, and the EXP field on an MPLS network.
Therefore, the S7700 is required to mark precedence fields of packets based on the network
type.
Generally, a device at the border of a network needs to mark the precedence fields of
incoming packets; the device at the core of a network provides corresponding QoS services
based on precedence fields marked by the border device, or re-marks the precedence fields
based on its configuration rule.
lRedirection
This traffic control action is used to redirect packets to the CPU, the specified interface,
the specified next hop address, or the Label Switching Path (LSP). The S7700 does not
forward packets based on the destination IP address. The S7700 can specify a maximum
of four next hops.
By using redirection, you can implement policy-based routing (PBR). The policy-based
route is a static route. When the next hop is unavailable, the S7700 forwards packets based
on the original forwarding path.
The S7700 can redirect only incoming packets.
lTraffic policing
This traffic control action is used to limit the volume of traffic and the resources used by
the traffic by monitoring the rate of the traffic. By using traffic policing, the S7700 can
discard, and re-mark the colors and CoS of packets whose rate exceeds the rate limit.
Here, traffic policing based on traffic classification is implemented. For details about traffic
policing, see 2 Traffic Policing and Traffic Shaping Configuration.
lFlow mirroring
This traffic control action is used to copy the specified data packets to a specified destination
to detect and troubleshoot faults on a network.
For details about flow mirroring, see Mirroring Configuration in the Quidway S7700 Smart
Routing Switch Configuration Guide - Device Management.
lTraffic statistics
This traffic control action is used to collect data packets of specified service flows, that is,
data packets matching defined complex traffic classification rules on the S7700.
You can dynamically add, modify, or delete the actions of a traffic behavior on the
S7700.
lDisabling Unicast Reverse Path Forward (URPF)
This traffic control action is used to disable URPF check for the flows matching traffic
classification on the S7700
For details about URPF, see Configuring URPF in the Quidway S7700 Smart Routing
Switch Configuration Guide - Security.
lDisabling MAC address learning
After MAC address learning is disabled, the S7700 does not learn source MAC addresses
of the packets matching traffic classification rules.
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On a stable network where MAC addresses of packets seldom change, disabling MAC
address learning can reduce the size of the MAC address table and improve device
performance. Unauthorized users may change MAC addresses frequently to attack a
network. To prevent MAC address overflow and protect the network from such attacks,
disable MAC address learning.
The S7700 can dynamically add, modify, and delete the actions in traffic behaviors.
Traffic Policy
A traffic policy is a QoS policy configured by binding traffic classifiers to traffic behaviors. You
can associate a traffic classifier with a traffic behavior in a traffic policy.
You can dynamically add, modify, or delete the traffic classifier and traffic behavior in a traffic
policy.
1.3 Configuring Priority Mapping Based on Simple Traffic
Classification
After priority mapping based on simple traffic classification is configured, the device maps
priorities of packets to PHBs and colors to provide differentiated services.
1.3.1 Establishing the Configuration Task
Before configuring priority mapping based on simple traffic classification, familiarize yourself
with the applicable environment, complete the pre-configuration tasks, and obtain the required
data. This helps you complete the configuration task quickly and accurately.
Applicable Environment
When packets come from an upstream device, you can classify them according to the precedence
fields in the packets, such as the 802.1p priority or DSCP priority. In a DiffServ domain, you
need to define the mapping from priorities of packets to PHBs and colors to classify packets.
After the DiffServ domain is bound to an incoming interface, the QoS mechanism performs
congestion management and congestion avoidance according to PHBs and colors of packets on
an outgoing interface.
When packets are sent to a downstream device, you can classify them according to PHBs and
colors of the packets. In a DiffServ domain, you need to define the mapping from PHBs and
colors of packets to priorities to classify packets. After the DiffServ domain is bound to an
outgoing interface, a downstream device provides QoS services according to priorities of
packets.
Pre-configuration Tasks
Before configuring priority mapping based on simple traffic classification, complete the
following task:
lAdding an interface that packets pass to a specified VLAN
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Data Preparation
To configure priority mapping based on simple traffic classification, you need the following
data.
No. Data
1Name of a DiffServ domain
2 802.1p priorities of upstream or downstream packets in a VLAN, DSCP priorities,
PHBs, and colors of upstream or downstream IP packets
3 Type and number of the interface bound to a DiffServ domain
1.3.2 Configuring an Interface to Trust the Priority of Packets
After an interface is configured to trust the priority of packets, the S7700 performs PHB mapping
according to the specified priority.
Context
The S7700 provides the following priority trust modes:
lTrusting the 802.1p priority of packets
If packets carry a VLAN tag, the S7700 searches for the mapping table of 802.1p priorities
and internal priorities and marks internal priorities for the packets according to the 802.1p
priorities of packets. If packets do not carry a VLAN tag, the S7700 uses the default 802.1p
priority of an interface and searches for the mapping table of 802.1p priorities and internal
priorities according to the default 802.1p priority.
lTrusting the DSCP priority of packets
The S7700 searches for the mapping table of DSCP priorities and internal priorities and
marks internal priorities for the packets according to the DSCP priorities of packets.
If you need to set the same trust priority on multiple interfaces, you can perform the configuration
on the port group to simplify the configuration.
NOTE
Internal priorities are represented by CoS and colors defined in the DiffServ model.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The interface view is displayed.
Or run the port-group port-group-name command to enter the port group view.
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NOTE
lThe interface type can be Ethernet, GE, XGE, or Eth-Trunk.
lYou need to create a port group before performing this task. For details on how to create a port group,
see (Optional) Configuring the Interface Group in the Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet.
lThe packet priority trusted by an interface cannot be configured by using a port group on W series
boards.
Step 3 Run:
trust { 8021p { inner | outer } | dscp }
The interface is configured to trust the priority of packets.
By default, an interface trusts the 802.1p priority in the outer VLAN tag of packets.
NOTE
lOn the S-series board:
lIf you run the trust 8021p inner command on the inbound interface, the S7700 maps the 802.1p
priorities in the outer VLAN tags to PHBs and colors.
lIf you run the trust 8021p outer command on the inbound interface, the S7700 maps the 802.1p
priorities in the outer VLAN tags to PHBs and colors. If a packet does not carry a tag, the packet
enters a queue according to the default 802.1p priority on the incoming interface.
lOn the E-series board and F-series board:
lOn the interface that receives the packets, the S7700 maps the priorities of the packets to PHBs
and colors according to the actual setting.
lOn the interface that forwards the packets, if the trust 8021p inner command is used, the priorities
of the packets are not mapped to the 802.1p priority in the inner tag if the packets carry double
tags. This is because the 802.1p priority in the outer tag mapped to PHBs and colors is added to
the 802.1p priority field of the outer tag.
lW series boards support only the trust dscp command and do not trust any packet priority by default.
For more information about S series boards, E series boards, F series boards, and W series boards, see
Board Classification in the Quidway S7700 Smart Routing Switch Hardware Description.
----End
1.3.3 (Optional) Setting the Default 802.1p Priority of an Interface
After the default 802.1p priority of an interface is set, if the interface is configured to trust 802.1p
priorities of packets, the S7700 performs PHB mapping for the received untagged packets
according to the default 802.1p priority.
Context
If an interface receives untagged packets, it needs to add the default VLAN ID and 802.1p priority
to the packets before forwarding them.
If an interface is configured to trust the 802.1p priority of packets, the S7700 uses the default
802.1p priority of the interface when the interface receives untagged packets.
Procedure
Step 1 Run:
system-view
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The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The interface view is displayed.
Step 3 Run:
port priority priority-value
The default 802.1p priority of the interface is set.
By default, the 802.1p priority of an interface is 0.
NOTE
The default 802.1p priority of an interface cannot be set on X40SFC boards.
----End
1.3.4 Creating a DiffServ Domain and Configuring Priority
Mapping
When the S7700 functions as a border node between a DiffServ domain and other networks, you
need to configure mappings between internal priorities (PHBs and colors) and external priorities
(such as 802.1p priorities, DSCP priorities, and EXP priorities).
Context
A DiffServ domain is composed of a group of interconnected DiffServ nodes that use the same
service policy and PHBs.
In the DiffServ domain, the S7700 maps priorities of incoming packets to PHBs and colors. On
the S7700, congestion management is performed for packets based on PHBs of packets and
congestion avoidance is performed for packets based on colors of packets. If packets are sent to
a downstream device, the S7700 binds a DiffServ domain to the outbound interface. In the
DiffServ domain, the S7700 maps PHBs and colors of packets to priorities so that the
downstream device provides QoS services based on priorities of packets.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
diffserv domain { default | ds-domain-name }
A DiffServ domain is created and the DiffServ domain view is displayed.
In the default DiffServ domain, mappings from priorities of packets to PHBs and colors are
defined. You can change the mappings defined in the default DiffServ domain, but cannot delete
the default DiffServ domain.
In addition to the default DiffServ domain, a maximum of seven domains can be created on the
S7700.
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Step 3 Run the following commands as required.
lTo map 802.1p priorities of packets in a VLAN to PHBs and colors, run the following
command on the inbound interface:
8021p-inbound 8021p-value phb service-class [ color ]
lTo map PHBs and colors of packets to 802.1p priorities of VLAN packets, run the following
command on the outbound interface:
8021p-outbound service-class color map 8021p-value
lTo map DSCP priorities of IP packets to PHBs and colors, run the following command on
the inbound interface:
ip-dscp-inbound dscp-value phb service-class [ color ]
lTo map PHBs and colors to DSCP priorities of IP packets, run the following command on
the outbound interface:
ip-dscp-outbound service-class color map dscp-value
lTo map EXP priorities of MPLS packets to PHBs and colors, run the following command
on the inbound interface:
mpls-exp-inbound exp-value phb service-class [ color ]
lTo map PHBs and colors of MPLS packets to EXP priorities, run the following command
on the outbound interface:
mpls-exp-outbound service-class color map exp-value
For details about the mappings from the default 802.1p priorities to PHBs and colors, from PHBs
and colors to 802.1p priorities, from DSCP priorities to PHBs and colors, from PHBs and colors
to DSCP priorities, from EXP priorities to PHBs and colors, and from PHBs and colors to EXP
priorities, see the 8021p-inbound, 8021p-outbound, ip-dscp-inbound, ip-dscp-outbound, mpls-
exp-inbound, and mpls-exp-outbound commands.
NOTE
The MPLS function of the S7700 is controlled by the license. By default, the MPLS function is disabled
on the S7700. To use the MPLS function of the S7700, purchase the license from Huawei local office.
S-series boards do not support MPLS.
S-series boards do not support priority mapping in the outbound direction on an interface.
For details about S-series boards, see Board Classification in the Quidway S7700 Smart Routing Switch
Hardware Description.
If the mpls-exp-inbound and mpls-exp-outbound commands are executed on the F48TFA, G48SFA,
G48TFA, G24TFA, G48TBC, or G48SBC board, a maximum of four DiffServ domains can be configured.
----End
1.3.5 Applying a DiffServ Domain
After the DiffServ domain is applied to a specified interface, the S7700 performs PHB mapping
for packets passing through the interface.
Context
To map priorities of packets coming from an upstream device to PHBs and colors based on the
mappings defined in a DiffServ domain, bind the DiffServ domain to the inbound interface. The
system maps priorities of packets to PHBs and colors based on the mappings defined in the
DiffServ domain.
Quidway S7700 Smart Routing Switch
Configuration Guide - QoS 1 Class-based QoS Configuration
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To map PHBs to priorities of packets sent to a downstream device based on the mappings defined
in a DiffServ domain, bind the DiffServ domain to the outbound interface. The system then maps
PHBs and colors to priorities of packets based on the mappings defined in the DiffServ domain.
To bind multiple interfaces to the same DiffServ domain, perform the configuration on the port
group to reduce the workload.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The interface view is displayed.
Or run the port-group port-group-name command to enter the port group view.
NOTE
lThe interface type can be Ethernet, GE, XGE, or Eth-Trunk.
lYou need to create a port group before performing this task. For details on how to create a port group,
see (Optional) Configuring the Interface Group in the Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet.
Step 3 Run:
trust upstream { ds-domain-name | default | none }
The interface is bound to a DiffServ domain.
If the trust upstream none command is run on an interface, the S7700 does not perform priority
mapping for incoming and outgoing packets on the interface.
To delete the DiffServ domain that is bound to an interface, you must first run the undo trust
upstream command to delete the bound DiffServ domain. Then run the trust upstream
command to reconfigure the DiffServ domain.
For details about the mappings from the default 802.1p priorities to PHBs and colors, from PHBs
and colors to 802.1p priorities, from DSCP priorities to PHBs and colors, from PHBs and colors
to DSCP priorities, from EXP priorities to PHBs and colors, and from PHBs and colors to EXP
priorities, see the 8021p-inbound, 8021p-outbound, ip-dscp-inbound, ip-dscp-outbound, mpls-
exp-inbound, and mpls-exp-outbound commands.
NOTE
W series boards do not support the trust upstream none command.
Step 4 (Optional) Run:
undo qos phb marking enable
PHB mapping of outgoing packets is disabled.
By default, PHB mapping is enabled on an outbound interface.
----End
Quidway S7700 Smart Routing Switch
Configuration Guide - QoS 1 Class-based QoS Configuration
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1.3.6 Checking the Configuration
After priority mapping based on simple traffic classification is configured, you can view the
mapping between packet priorities and PHBs and the mapping between local precedences and
queues.
Prerequisite
The configurations of priority mapping based on simple traffic classification are complete.
Procedure
lRun the display diffserv domain [ all | name ds-domain-name ] command to check the
configuration of the DiffServ domain.
----End
1.4 Creating a Traffic Policy Based on Complex Traffic
Classification
After the traffic policy based on complex traffic classification is configured, the S7700 classifies
packets according to the priority of packets and quintuple information. Then the S7700 takes
different traffic actions for packets matching classification conditions, such as permit/deny, re-
marking, and redirection.
1.4.1 Establishing the Configuration Task
Before configuring the traffic policy based on complex traffic classification, familiarize yourself
with the applicable environment, complete the pre-configuration tasks, and obtain the required
data. This helps you complete the configuration task quickly and accurately.
Applicable Environment
At the ingress of a network, the S7700 functions as a border node. To limit the incoming traffic
on a network, the S7700 can provide differentiated services for various services according to
the DSCP field, protocol type, IP address, port number, fragmentation type, and time range of
packets. In this case, you need to create a traffic policy based on complex traffic classification.
Generally, complex traffic classification is configured on a border node, and simple traffic
classification is configured on a core node.
Pre-configuration Tasks
Before creating a traffic policy based on complex traffic classification, complete the following
tasks:
lConfiguring the physical parameters of interfaces
lSetting link layer attributes of interfaces
lConfiguring routing protocols to ensure the connectivity of the network
lConfiguring ACLs if ACLs are used as matching rules for traffic classification
Quidway S7700 Smart Routing Switch
Configuration Guide - QoS 1 Class-based QoS Configuration
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Data Preparation
To create a traffic policy based on complex traffic classification, you need the following data.
No. Data
1Name of the traffic classifier and matching rules of the traffic classifier
2 Name of the traffic behavior and related parameters
3 Name of the traffic policy
4 Interface that the traffic policy is applied to and ID of the VLAN
1.4.2 Configuring Complex Traffic Classification
The S7700 can classify traffic according to the ACL, and the Layer 2 information and Layer 3
information in packets.
Creating a Traffic Classifier Based on Layer 2 Information
After traffic classification based on Layer 2 information is configured, the S7700 classifies
packets based on the Layer 2 information including the 802.1p priority, VLAN ID, source/
destination MAC address, incoming/outgoing interface, and Layer 2 protocol type.
Context
Do as follows on the S7700 where a traffic classifier based on Layer 2 information needs to be
created.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
traffic classifier classifier-name [ operator { and | or } ] [ precedence
precedence-value ]
A traffic classifier based on Layer 2 information is created and the traffic classifier view is
displayed.
The and parameter indicates that the relationship between rules in a traffic classifier is "AND".
That is, the packets match a traffic classifier only when the packets match all non-ACL rules
and an ACL rule in the traffic classifier. The or parameter indicates that the relationship between
rules in a traffic classifier is "OR". That is, the packets match a traffic classifier when the packets
match a rule in the traffic classifier.
By default, the relationship between rules in a traffic classifier is OR.
Step 3 Run the following commands as required.
Quidway S7700 Smart Routing Switch
Configuration Guide - QoS 1 Class-based QoS Configuration
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