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    Encapsulation Type Lockout for PPPoE Clients Overview

    In configurations with dynamic PPPoE subinterfaces over static PPPoE major interfaces, you can configure dynamic encapsulation type lockout for the PPPoE clients associated with a dynamic PPPoE subinterface column. Using this feature enables you to temporarily prevent the static PPPoE major interface from autodetecting, accepting, and creating dynamic PPPoE subinterface columns for a configurable time period.

    By default, encapsulation type lockout is disabled for PPPoE clients. To configure a lockout time range for the PPPoE clients associated with the dynamic PPPoE subinterface columns on the PPPoE major interface, use the pppoe auto-configure command with the lockout-time keyword. You can also use the show pppoe interface lockout-time command to display detailed information about the current lockout condition for each PPPoE client, and the pppoe clear lockout interface command to clear (reset) the lockout condition for an individual PPPoE client.

    For information about the working of the dynamic encapsulation type lockout feature for PPPoE sessions that contain the interworking function (IWF)-Session digital subscriber line (DSL) Forum vendor-specific attribute (VSA) (26-254) in the PPPoE active discovery request (PADR) packets, see Encapsulation Type Lockout Based on DSL Forum VSAs for IWF PPPoE Sessions.

    For illustrations of the interface stacking in dynamic PPPoE over static PPPoE configurations, see the figures provided in Configuring Dynamic PPPoE over Static PPPoE with ATM Interface Columns, Configuring Dynamic PPPoE over Static PPPoE with Ethernet Interface Columns, Configuring Dynamic PPPoE over Static PPPoE with Ethernet and VLAN Interface Columns, and Configuring Dynamic PPPoE over Static PPPoE with Ethernet and S-VLAN Interface Columns.

    Differences from Lockout Configuration for PPPoE over Static ATM

    Table 1 lists the important differences between how encapsulation type lockout works for dynamic PPPoE over static PPPoE configurations and how lockout works for dynamic PPPoE over static ATM 1483 configurations.

    Table 1: Differences in Lockout Operation for Dynamic PPPoE Configurations

    Dynamic PPPoE over Static PPPoE

    Dynamic PPPoE over Static ATM 1483

    Encapsulation type lockout is disabled by default.

    Encapsulation type lockout is enabled by default with a lockout time range of 1–300 seconds.

    You must explicitly configure encapsulation type lockout for PPPoE clients with the pppoe auto-configure command.

    PPPoE clients automatically inherit their lockout setting from the lockout parameters configured for the underlying static ATM 1483 subinterface with the auto-configure command.

    Currently, the dynamic PPPoE interface layer must be configured directly above the static ATM 1483 interface layer to support inheritance of lockout parameters. For an illustration of dynamic PPPoE over static ATM 1483 interface stacking, see the Dynamic PPPoE Interface Columns.

    For more information about the benefits and operation of dynamic encapsulation type lockout, see Dynamic Encapsulation Type Lockout. In particular, see Guidelines for Configuring Encapsulation Type Lockout for PPPoE Sessions for information about the rules that apply when you configure the lockout time. These rules are common to both dynamic PPPoE over static PPPoE configurations and dynamic PPPoE over static ATM 1483 configurations.

    Published: 2014-08-14