Alcatel-Lucent 7750 SR-OS Configuration Manual page 140

Router L2TP Commands
ppp
Syntax ppp
Context config>router>l2tp>group
Description This command configures PPP for the L2TP tunnel group.
authentication
Syntax authentication {chap|pap|pref-chap}
Context config>router>l2tp>group>ppp
Description This command configures the PPP authentication protocol to negotiate.
authentication-policy
Syntax authentication-policy auth-policy-name
no authentication-policy
Context config>router>l2tp>group>ppp
Description This command configures the authentication policy.
Parameters
auth-policy-name — Specifies the authentication policy name.
default-group-interface
Syntax default-group-interface ip-int-name service-id service-id
no default-group-interface
Context config>router>l2tp>group>ppp
Description
This command configures the default group interface.
Parameters ip-int-name — Specifies the interface name.
service-id — Specifies the service ID.
svc-name — Specifies the service name (instead of service ID).
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7750 SR OS Router Configuration Guide