•
Dual-stack L2-connected Internet Protocol Over Ethernet (IPoE) subscriber sessions
Features Supported for Dual-Stack PMIPv6 Sessions
•
IPv4 address allocation method using Dynamic Host Configuration Protocol (DHCP)
•
IPv6 address allocation method using Stateless Address Auto Configuration (SLAAC)
•
Idle timeout for per-user accounting and per-flow accounting
•
Absolute timeout for per-user accounting and per-flow accounting
•
Postpaid for per-user accounting and per-flow accounting
•
QoS policy for per-user accounting and per-flow accounting
Information About Dual-Stack Support for GTP
The Dual Stack Support for GTP feature allows both IPv4 and IPv6 traffic streams to flow through a single
GTP session. The IPv4 and IPv6 traffic streams from a subscriber are identified using the Subscriber MAC
address. This feature enables the assignment of both an IPv4 address and an IPv6 address to a client. Therefore,
the overall number of supported subscribers on the Cisco ASR 1000 Series Aggregation Services Routers are
not affected by a mix of IPv4 and IPv6 traffic.
Prior to the introduction of the Dual-Stack feature, GTP supported only IPv4 sessions.Note
Dual-Stack GTP sessions support the following session initiators:
•
Unclassified MAC
•
IPv6 Neighbor Discovery
•
DHCPv4
Restrictions for Dual-Stack GTP
•
The connection between the iWAG and GGSN or PGW can only be IPv4 even though the sessions can
be IPv4, IPv6, or dual stack.
•
The DNS server (under the gtp or apn configuration submode) can be configured only for IPv4.
AAA Attributes for Dual Stack
After the AAA server authenticates a subscriber, an AAA attribute is returned in the Access Accept message
sent to the iWAG to indicate the session type.
The AAA attribute for the Dual Stack configuration can have the following values:
•
"cisco-AVPair=mn-service=dual"
Intelligent Wireless Access Gateway Configuration Guide
70 OL-30226-03
Dual Stack Support for PMIPv6 and GTP
Features Supported for Dual-Stack PMIPv6 Sessions
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