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PDN Gateway Overview
IP Address Hold Timers
Also known as address quarantining, this subscriber-level CLI introduces an address hold timer to temporarily buffer a
previously assigned IP address from an IP address pool to prevent it from being recycled and reassigned to a new
subscriber session. It is especially useful during inter-RAT handovers that sometimes lead to temporary loss of the
mobile data session.
This feature provides a higher quality user experience for location-based services where the remote host server needs to
reach the mobile device.
Important:
IPv6 Capabilities
Enables increased address efficiency and relieves pressures caused by rapidly approaching IPv4 address exhaustion
problem.
The P-GW offers the following IPv6 capabilities:
Native IPv6 and IPv6 transport
Support for any combination of IPv4, IPv6 or dual stack IPv4/v6 address assignment from dynamic or static
address pools on the P-GW.
Support for native IPv6 transport and service addresses on PMIPv6 S2a interface. Note that transport on GTP
S5/S8 connections in this release is IPv4 based.
Support for IPv6 transport for outbound traffic over the SGi reference interface to external Packet Data
Networks.
IPv6 Connections to Attached Elements
IPv6 transport and interfaces are supported on all of the following connections:
Diameter Gx policy signaling interface
Diameter Gy online charging reference interface
S6b authentication interface to external 3GPP AAA server
Diameter Rf offline charging interface
Lawful Intercept (X1, X2 interfaces)
Routing and Miscellaneous Features
OSPFv3
MP-BGP v6 extensions
IPv6 flows (Supported on all Diameter QoS and Charging interfaces as well as Inline Services (e.g. ECS)
Local Break-Out
Provides a standards-based procedure to enable LTE operators to generate additional revenues by accepting traffic from
visited subscribers based on roaming agreements with other mobile operators.
Currently, the P-GW only supports an address hold timer with IPv4 addresses.
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
Features and Functionality - Base Software ▀
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