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## Guidelines for Configuring Hierarchical Parameters

Use the following guidelines when specifying a hierarchical parameter:

- You can specify only a subset of the instance-interface types that are supported for non-hierarchical parameters. The following output lists the instance-interface types that are supported:
  `
  host1(config)#qos-parameter-define hierarchical-parameter hierarchical
  host1(config-qos-parameter-define)#instance-interface-type ?
  atm-vc ATM Virtual Circuit (VC)
  ip IP interface
  ipv6 IP version 6 interface
  l2tp-session L2tp session interface
  vlan VLAN subinterface
  `
- You can specify only one instance-interface type per hierarchical parameter. For example:
  `
  host1(config)#qos-parameter-define hierarchical-parameter hierarchical
  host1(config-qos-parameter-define)#instance-interface-type ip
  host1(config-qos-parameter-define)#instance-interface-type vlan
  % only one instance-interface-type can be specified for a hierarchical parameter
  `
- Hierarchical instance-interface types cannot stack above the highest controlled-interface type. For example:
  `
  host1(config)#qos-parameter-define hierarchical-parameter hierarchical
  host1(config-qos-parameter-define)#controlled-interface-type ip
  host1(config-qos-parameter-define)#instance-interface-type vlan
  % hierarchical instance-interface-type vlan cannot stack above
  controlled-interface-type ip
  `

  In contrast, a non-hierarchical instance-interface type cannot stack above the lowest controlled-interface type (vlan). For example:

  `
  host1(config)#qos-parameter-define non-hierarchical-parameter
  host1(config-qos-parameter-define)#controlled-interface-type vlan
  host1(config-qos-parameter-define)#instance-interface-type ip
  % instance-interface-type ip cannot stack above the lowest controlled-interface-type
  `
- You must specify a subscriber-interface type that is identical to the instanceinterface type that you specified.

#### Related Topics

- Configuring a Parameter Definition to Calculate Hierarchical Instances

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