Cisco Cisco Packet Data Gateway (PDG) Guia De Resolução De Problemas
Always-on
▀ Overview
▄ Cisco ASR 5000 Series Enhanced Feature Configuration Guide
OL-22982-01
Overview
Always-on is enabled for each subscriber individually through a local subscriber profile or a RADIUS profile. Always-
on is disabled for all subscribers by default.
on is disabled for all subscribers by default.
If Always-on is enabled for a subscriber, when the idle time-out limit is reached the subscribers IP/PPP session remains
connected as long as the subscriber is reachable. This is true even if the airlink between the mobile device and the RN
(Radio Node) is moved from active to dormant (inactive) status. When the idle timeout limit is reached, the PDSN
determines Mobile Node availability using LCP keepalive messages. A response to these messages indicates that the
―always-on‖ status should be maintained. Failure to respond to a predetermined number of LCP keepalive messages
causes the PDSN to tear-down (disconnect) the subscriber session.
connected as long as the subscriber is reachable. This is true even if the airlink between the mobile device and the RN
(Radio Node) is moved from active to dormant (inactive) status. When the idle timeout limit is reached, the PDSN
determines Mobile Node availability using LCP keepalive messages. A response to these messages indicates that the
―always-on‖ status should be maintained. Failure to respond to a predetermined number of LCP keepalive messages
causes the PDSN to tear-down (disconnect) the subscriber session.
Caution:
When always-on is enabled, the subscriber must have an idle time-out period configured (default is 0,
no time-out). Failure to configure an idle time-out results in the LCP keepalive messages never being sent and the
subscriber session stays up indefinitely.
subscriber session stays up indefinitely.
The RADIUS attribute 3GPP2-Always-On defined in a subscriber profile stored remotely on a RADIUS server can be
used to enable Always-on for the subscriber. The attribute has two possible values, inactive and active. To enable
Always-on, set the attribute to active.
used to enable Always-on for the subscriber. The attribute has two possible values, inactive and active. To enable
Always-on, set the attribute to active.
For more information, refer to AAA Interface Administration and Reference.