Configuring a Dynamic Interface over an ATM 1483 Subinterface

You use the auto-configure command to configure an ATM 1483 subinterface to support a dynamic interface. After the subinterface is configured, it performs autodetection to identify the encapsulation, resulting in the dynamic creation of the higher protocol layers. This command specifies one or more types of next upper dynamic encapsulations that the static interfaces can detect or accept.

This command creates the layers above ATM 1483 dynamically. You can enter the command repetitively in Subinterface Configuration mode to support multiple dynamic interface types.

Note: On static ATM 1483 interfaces, dynamic encapsulation types can be bridged Ethernet, IP, IPv6, PPP, or PPPoE.

Encapsulation type lockout is performed on a per-encapsulation-type basis for each subinterface. An encapsulation type not configured for autodetection with the auto-configure command is automatically locked out. The lockout temporarily prevents the static ATM 1483 subinterface from detecting, accepting, and creating the encapsulation type until the lockout time expires.

You can use the lockout-time keyword to set the minimum lockout time and maximum lockout time, each of which can be in the range 1–86400 seconds (24 hours). The default range is 1–300 seconds (5 minutes).

You can use the none keyword with the lockout-time keyword to disable lockout for the specified encapsulation type.

Note: Disabling lockout can result in undesirable CPU loading; we recommend that you not disable lockout for general use. At a minimum, use the default lockout time.

For information about the rules that apply when you configure the lockout time for dynamic encapsulation type lockout, see Guidelines for Configuring Encapsulation Type Lockout for PPPoE Sessions.

To configure a static ATM 1483 subinterface to support a dynamic interface:

• Issue the auto-configure command in Subinterface Configuration mode.
  1. Enable autodetection for the PPPoE encapsulation type using the default lockout time range, 1–300 seconds.
     host1(config-subif)#auto-configure pppoe
  2. Enable autodetection for the PPP encapsulation type using a nondefault lockout time range, 5–60 seconds.
     host1(config-subif)#auto-configure ppp lockout-time 5 60
  3. Disable encapsulation type lockout for the PPPoE encapsulation type.
     host1(config-subif)#auto-configure pppoe lockout-time none
  4. Reenable encapsulation type lockout for the PPPoE encapsulation type using the default lockout time range.
     host1(config-subif)#auto-configure pppoe

     Or

     host1(config-subif)#no auto-configure pppoe lockout-time
  5. Permanently lock out the PPP encapsulation type until the auto-configure ppp command is issued.
     host1(config-subif)#no auto-configure ppp

  Use the no version to terminate detection of the specified encapsulation type or, if the lockout-time keyword is specified, to restore the lockout time range to its default value, 1–300 seconds.