Configure a Quality of Service

Before you begin

Determine whether you are going to attach the QoS forwarding group to a route map or an ACL. ACL provides greater granularity.
Determine the queue priority to attach.

Procedure

Enter the QoS config mode.
```
device# qos
device(config-qos)#
```

Create a QoS forwarding group.

device(config-qos)# forwarding-group fg1

Create a queue with the required priority in the format q0 through q7 for the QoS forwarding group.
```
device(config-qos-group)# queue q1
```
- A maximum of eight queues are supported.
- The highest queue priority is q7 and q0 (default) is the lowest queue priority.
Attach the QoS forwarding group to the route-map or ACL, as required.
- Attach the QoS forwarding group to the route-map.
```
device(config)# route-map map1 1
forward-action permit
device(config-route-map)# qos-forwarding-group group_name
```
  Note
  The route-map allows you to configure actions that are common for all ACLs under the route-map.
- Attach the QoS forwarding group to each access control entry (ACE). If a packet matches the criteria of the ACE, the packets are treated with the QoS configurations present in the attached QoS forwarding group.
```
device (qos-fowarding-group)# ip access-list acl1
seq 10 permit tcp any any qos-forwarding-group fg1 
seq 20 permit udp any any qos-forwarding-group fg2 
seq 30 permit ip any any
```
  Note
  If the forwarding group is not attached, seq uses the QoS forwarding group from the route-map for an IPv4 ACL.

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