QoS Profiles

A QoS profile specifies queue profiles, drop profiles, statistics profiles, and scheduler profiles in combination with interface types. A QoS profile specifies the queue, drop statistics gathering, and scheduler configuration for a subtree of the interface hierarchy. The QoS profile controls the way scheduler nodes and queues are bound to the interfaces above its attachment point in the interface hierarchy.

A QoS profile is attached to the interface at the base of the subtree hierarchy. For example, a QoS profile attached to an ATM port specifies queuing attributes for interfaces of all types that are stacked over the port.

NOTE: QoS profile commands affect only ASIC modules.

Configuring QoS Profiles

To configure a QoS profile, you name the profile and also name the traffic class and/or the queue profile, drop profile, statistics profile, scheduler profile, or traffic-class group that belongs to the QoS profile. Each command begins with a keyword that designates an interface type. Table 21 lists the interface types and the commands that you can use with them.

 Table 21:  Interface Types and Supported Commands 

 Interface Type
 Queue
 Node
 Group

 atm

 x

 x

 x


 atm-vc

 x

 x

 


 atm-vp

 x

 x

 


 bridge

 x

 x

 


 cbf

 x

 x

 


 ethernet

 x

 x

 x


 fr-vc

 x

 x

 


 ip

 x

 x

 


 ip-tunnel

 x

 x

 


 ipv6

 x

 x

 


 l2tp-session

 x

 x

 


 l2tp-tunnel

 x

 x

 


 lsp

 x

 x

 


 serial

 x

 x

 x


 server-port

 x

 x

 x


 vlan

 x

 x

 



 

To configure a QoS profile, perform the following steps:

1. Create a QoS profile and enter QoS Profile Configuration mode.

host1(config)#qos-profile qosp-vc-queuing

host1(config-qos-profile)#

2. (Optional) Add a traffic-class group, a scheduler profile, and a statistics profile to the QoS profile.

host1(config-qos-profile)#atm group groupA scheduler-profile scheduler1 
statistics-profile statpro-1

3. (Optional) Configure a queue for interfaces in the specified traffic class.

host1(config-qos-profile)#atm queue traffic-class strict-priority scheduler-profile 
scheduler1

4. (Optional) Display the components of the QoS profile.

host1#show qos-profile

qos-profile qosp-vc-queuing:

interface rule                  scheduler   queue  t-class  drop   statistics

  type    type   traffic class   profile   profile  group  profile  profile

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

atm       queue strict-priority scheduler1 default         default statpro-1

atm       group                 scheduler1         groupA 

Creating QoS Profiles

Use the following command in Configuration mode to create QoS profiles.

qos-profile

• Use to create a QoS profile and to enter QoS Profile Configuration mode.
• Example

host1(config)#qos-profile qosp-vc-queuing

host1(config-qos-profile)#

• Use the no version to remove the QoS profile.

Adding Groups, Nodes, and Queues to QoS Profiles

Use the commands in this section in QoS Profile Configuration mode to add groups, nodes, and queues to QoS profiles.

group

• Use to configure a group node for each interface of the specified type.
• The group defaults to default group.
• The router supports only one named traffic-class group above a given port.
• Each traffic class can belong to only one traffic-class group (either the default group or a named group).
• Examples

To create a group node in the default group:

host1(config-qos-profile)#atm group default 

To create a group node in a named group:

host1(config-qos-profile)#atm group groupA 

To associate a scheduler profile with a named group:

host1(config-qos-profile)#atm group groupA scheduler-profile scheduler1

• Use the no version to remove this rule from the QoS profile.

node

• Use to configure a scheduler node for each interface of the specified type.
• The optional scheduler profile supplies a relative weight and potentially a shaping rate to be applied at the scheduler node.
  

  NOTE: For ASIC modules, you cannot associate a scheduler profile with a port-type interface unless you also specify the strict-priority group.

  
  
• Example

host1(config-qos-profile)#ip node scheduler-profile scheduler1 group strict-priority

• Use the no version to remove this rule from the QoS profile.

queue

• Use to configure a queue for each interface in the specified traffic class.
• You can include any of the following profiles:

• The scheduler profile supplies a relative weight and potentially a shaping rate to be applied at the queue.
• The queue profile supplies threshold information for the queue if the router defaults are not appropriate.
• The drop profile supplies dropping behavior of a set of egress queues.

• Each queue traffic class can appear in only one traffic-class group.
• Example

host1(config-qos-profile)#atm queue traffic-class strictPriority

• Use the no version to remove this rule from the QoS profile.

Attaching QoS Profiles

Use the commands in this section in Configuration mode to attach QoS profiles to interfaces.

atm-vp qos-profile

• Use to attach a QoS profile to the specified VP on the ATM interface.
• The profile applies to all VCs in the VP; for example, the profile specifies the hierarchy of scheduler nodes and queues for all VCs, IP interfaces, and L2TP session stacked above the VP.
• Example

host1(config)#interface atm 3/0

host1(config-if)#host1(config-if)#atm-vp 50 qos-profile qosp-vp-strictbw

• Use the no version to detach the QoS profile from a given VP.

qos-profile

• Use to attach a QoS profile to an interface.
• Example

host1(config)#interface atm 2/0

host1(config-if)#qos-profile low-latency-q-p

• Use the no version to remove the QoS profile.