Quality of Service

Table Of Contents

Quality of Service

Create QoS Policy

QoS Wizard

Interface Selection

QoS Policy Generation

View QoS Class Details

Summary of the configuration

Edit QoS Policy

Edit QoS Class

Add a Protocol

Interface Association

QoS Status

Quality of Service

The Quality of Service ( QoS) Wizard allows a network administrator to enable Quality of Service (QoS) on the router's WAN interfaces. QoS can also be enabled on IPSec VPN interfaces and tunnels. The QoS edit windows enables the administrator to edit policies created using the wizard.

Create QoS Policy

The QoS Wizard allows a network administrator to enable Quality of Service ( QoS) on the router's WAN interfaces. QoS can also be enabled on IPSec VPN interfaces and tunnels.

The policy is applied to outgoing traffic on the interface.

Create QoS Policy Tab

Click to add a new QoS policy.

Edit QoS Policy Tab

Click to edit an existing QoS policy.

Launch QoS Wizard Button

Click to launch the QoS wizard. The QoS wizard allows you to configure QoS policies on your WAN interfaces.

QoS Wizard

Next

Click the Next button to begin configuring a QoS policy.

Interface Selection

Choose the interface on which you want to configure the QoS policy in this window. This window lists WAN interfaces, and interfaces which do not have a configured outbound QoS policy. VPN interfaces are included in the list, but interfaces used for Easy VPN clients, and interfaces with an existing QoS policy are not included. QoS is not supported for Easy VPN clients.

Details Button

Click this button to view configuration details about the interface. The window displays the interface's IP address and subnet mask, names of access rules and policies applied to the interface, and connections the interface is used for.

QoS Policy Generation

Use this window to allocate the bandwidth to the different types of traffic going out from the selected interface. SDM supports two types of traffic: Real-Time Traffic and Business-Critical Traffic.

SDM creates a policy to provide quality of service to Real Time traffic and Business-Critical traffic:

•Real Time traffic—SDM creates two classes to handle Voice over IP (VoIP) traffic and voice-signalling traffic.

•Business Critical traffic—SDM creates three QoS classes for business traffic important to a typical corporate environment. Some of the protocols included in this traffic category are: citrix, sqlnet, notes, ldap, and secure ldap. Routing protocols included in this category are egp, bgp, eigrp, and rip.

The remaining traffic is given Best-Effort service.

Bandwidth Allocation

This area allows you to track and allocate bandwidth to the outgoing traffic.This column also lists the bandwidth remaining after allocating bandwidth to each traffic type going out on the selected interface.

Note At least one traffic type has to be selected to generate the QoS policy.

Type of Traffic

This column list the type of traffic exiting the selected interface. The three traffic types are: Real-Time, Business-Critical, and Best-Effort.

Bandwidth in %

Enter bandwidth values in the Bandwidth in % field. SDM recommends 72% of available bandwidth allocation for real-time traffic and 3% of available bandwidth for business-critical traffic.

Note The Cisco IOS software does not allow you to allocate more than 75% of the total interface bandwidth to one or more QoS classes.

SDM dynamically adjusts the value for Best-Effort traffic when you enter values for Real Time or Business-Critical so that the total bandwidth is always 100%.

kbps value

This column displays the bandwidth allocated to each type of traffic in kilo bits per second (kbps) units. This field is read-only and is automatically updated based on the percentage value entered in the Bandwidth in % field.

View Details

Click on the View Details button if you want to check QoS classes created for the selected traffic type. SDM will generate default QoS policy consisting of pre-defined QoS classes for each traffic type. See View QoS Class Details to learn more about the contents of this window.

View QoS Class Details

The window that appears when you click the View Details button displays details of the QoS classes that are going to be created for the QoS policy.

Real Time Traffic

Click the Real Time Traffic tab to view details of QoS class type and class attributes configured for the Real-Time Traffic type. Attributes cannot be edited in this window. If you need to modify the attributes, complete the wizard and then click the Edit QoS policy tab to modify the policy that you created.

QoS Class

This column lists the QoS classes configured for the selected traffic type.

Value

This column lists the values of the QoS class configured for the selected traffic type.

Close—Click on Close button to exit the View QoS Class Details window.

Business-Critical Traffic

Click the Business-Critical Traffic tab to view details of QoS class type and class attributes configured for the Business-Critical Traffic type. Attributes cannot be edited in this window. If you need to modify the attributes, complete the wizard and then click the Edit QoS policy tab to modify the policy that you created.

QoS Class

This column lists the QoS classes configured for the selected traffic type.

Value

This column lists the values of the QoS class configured for the selected traffic type.

Close—Click on Close button to exit the View QoS Class Details window.

Summary of the configuration

The QoS Wizard Summary window displays the summary of QoS policy-map and its related QoS class-maps. This policy map will inturn be attached to the selected interface for configuring QoS policy.

Clicking Finish exits the QoS Wizard and takes you to the Edit QoS Policy screen.

Edit QoS Policy

The Edit QoS Policy window allows to change already configured QoS policies.

Clone

Click on Clone button to clone the selected QoS policy.

Delete

Click on Delete button to delete the selected QoS policy.

QoS Policies

This area lists the existing QoS policies.

Policy Name

This column list the QoS policies configured on the interface.

Policy Type

This column lists the type of policies configured on the interface.

•SDM-Default—The policy is the SDM default policy.

•SDM-Cloned—The policy is a clone of another policy. Cloning an existing policy is an easy way to copy settings that you don't want to change.

•CLI-Created—The policy was created using the IOS CLI.

Applied to Interface

This column lists the interface to which the QoS policy is applied.

IP Address

The IP address of the interface to which the policy is applied.

Qos Policy Details

This area lists type of traffic and the bandwidth allocated to each traffic type configured.

Real-Time/Business-Critical/Trivial

The percentage of overall bandwidth allocated to each of these traffic types.

Traffic Type

Lists the type of traffic configured on the interface by the QoS policy. Possible values are:

•Real-Time—Voice over IP (VoIP) traffic and voice-signalling traffic.

•Business-Critical—Business traffic important to a typical corporate environment. Some of the protocols included in this traffic category are: citrix, sqlnet, notes, ldap, and secure ldap. Routing protocols included in this category are egp, bgp, eigrp, and rip.

•Trivial—Remaining traffic.

Class Name

The name of the QoS class. SDM predefines names for QoS classes.

Enabled

A green checkmark indicates this class is enabled. A red icon with a white X indicates the class is not enabled for this policy. To enable a class, click Edit and enable the class in the Edit QoS Class window.

Protocols

The protocols included in this QoS class. A Real-Time traffic QoS class might have protocols such as cuseeme, netshow, and rtp video. A Business-Critical traffic QoS class might have protocols such as DHCP, EIGRP, and OSPF.

Queuing

This column lists the queuing type, either bandwidth or priority. Class Based Weighted Fair Queuing (CBWFQ) defines two types of Low Latency Queuing methods—bandwidth and priority.

•Priority—Priority ensures a fixed amount of bandwidth for whatever bandwidth value is configured for the QoS class

•Bandwidth—Bandwidth queuing promises a minimum amount of bandwidth. The traffic may at time receive more bandwidth, but the bandwidth never drops below the minimum.

Percent

If Priority queuing is used, there is a percent value in this column. This column is empty if Bandwidth queuing is used.

Remaining Percent

If Bandwidth queuing is used, there is a percent value in this column. This column is empty if Priority queuing is used.

DSCP

The DSCP marking selected for this QoS class.

Edit QoS Class

This window allows you to edit QoS class attributes of the selected traffic type.

Add this class to the policy

Check this option to include the selected QoS class in QoS policy. If this option is not checked, then the selected QoS class is marked as Disabled in the Edit QoS Policy window.

Protocol/Application

This area lists all the default protocols configured for the selected QoS class. You can add or delete protocols.

Add

Click this button to add an NBAR-recognized protocol that has not be matched under any of the existing classes.

Delete

Select the protocols from the list and click Delete button to delete protocols from the traffic class.

Note The Add and Delete buttons are disabled for real-time traffic classes except for the SDM-generated SDMQoS-StreamVideo class.

Queuing Type

Class Based Weighted Fair Queuing (CBWFQ) defines two types of Low Latency Queuing methods—bandwidth and priority. Bandwidth queuing promises a minimum amount of bandwidth, and Priority ensures a fixed amount of bandwidth for whatever bandwidth value is configured for the QoS class.

•Priority—If you select Priority, enter the fixed percentage of bandwidth that you want to give to the QoS class. You can give from 1 to 75 percent of bandwidth.

•Bandwidth—If you select Bandwidth, the QoS class receives a minimum percentage of the remaining bandwidth. Enter that percentage in the Remaining Percent field.

DSCP Marking

This area allows you to select the type of DSCP marking for the real-time traffic.

Note This field will not appear if you checked the Trust (rely on) DSCP-markings of the packets for traffic classification option under the Interface Selection window.

Add a Protocol

This window allows you to add the protocols that are not added to the real-time traffic class.

NBAR Protocol

This area lists the NBAR protocols that are not added to any of the traffic classes. Select the NBAR protocol from the list and click OK button to add the protocol.

Note If all the NBAR protocols are added to the traffic class, the Custom Protocol radio button will be selected by default and the NBAR Protocol radio button will be disabled.

Custom Protocol

This area allows you to define custom protocols with known port number.

Name

Name of the custom protocol to be defined.

Port Number(s)

This area list the port numbers that are added for the selected custom protocol.

A maximum of 16 port numbers can be added for a custom protocol. The Add... button will be disabled when there are 16 port numbers in the Port Number(s) box.

SDM displays a warning message if the same port number is added twice for the selected custom protocol.

Delete

Select the port number from the Port Number(s) box and click on Delete button to remove the port number from the Port Number(s) box.

Interface Association

This window provides you the opportunity to associate a cloned policy to an interface.

Interface list

The interface list displays the interfaces with which you can associate the QoS policy. If you want to associate the cloned policy to an interface, select the interface from the list and click Yes.

Details Button

Click to view details about the selected interface such as IP address/subnet mask, ACLs applied to the interface, and IPSec policies associated with the interface.

Yes Button

Click if you want to associate the QoS policy to the selected interface.

No Button

Click if you do not want to associate the QoS policy to the selected interface.

QoS Status

The QoS Status window allows you to monitor the performance of the traffic on QoS configured interfaces. This window also allows to monitor bandwidth utilization and bytes-sent for interfaces with no QoS configuration. Monitoring inbound traffic on QoS interfaces shows the statistics only at a protocol level. Protocol-level statistics for non-QoS interfaces are collected for traffic in both directions.

This window allows you to monitor the following statistics:

•Bandwidth utilization for SDM defined traffic types

–Bandwidth utilization per class under each traffic type

–Bandwidth utilization for protocols under each class

Bandwidth utilization is shown in Kbps.

•Total incoming and outgoing bytes for each traffic type

–Incoming and outgoing bytes for each class defined under the traffic type

–Incoming and outgoing bytes for each protocol for each class

If the value is more than 1,000,000, then the graph may show the bytes as a multiple of 10^6. If the value is more than 1,000,000,000, then the graph may show the bytes as a multiple of 10^9.

•Packets dropped statistics for each traffic type

Interface—IP/Mask—Slot/Port—Description

This area lists the interfaces with associated QoS policies, their IP addresses and subnet masks, slot/port information if applicable, and available descriptions.

Select the interface that you want to monitor from this list.

View Interval

Select the interval at which statistics should be gathered:

•Now—Statistics are gathered when you click Start Monitoring.

•Every 1 minute—Statistics are gathered when you click Start Monitoring, and refreshed at 1-minute intervals.

•Every 5 minutes—Statistics are gathered when you click Start Monitoring, and refreshed at 5-minute intervals.

•Every 1 hour—Statistics are gathered when you click Start Monitoring, and refreshed at 1-hour intervals.

Start Monitoring

Click to start monitoring QoS statistics.

Select QoS Parameters for Monitoring

Select the traffic direction and type of statistics you want to monitor.

Direction

Click either Input or Output.

Statistics

Select one of the following

•Bandwidth

•Bytes

•Packets dropped

All Traffic—Real-Time—Business-Critical—Trivial

SDM displays statistics for all traffic classes in bar chart form, based on the type of statistic you selected. SDM displays a message instead of a bar chart if there are not adequate statistics for a particular traffic type.