A tunnel facilitates bidirectional transport or acts as a conduit for
forwarding subscriber traffic. In PMIPv6, subscriber traffic is transported
between the MAG and the Local Mobility Anchor (LMA) through the Generic Routing
Encapsulation (GRE) tunnel. In the GTP, subscriber traffic is transported
between the iWAG and the GGSN through the GTP tunnel. The tunnel information
structure is associated with each tunnel and specifies common tunnel
attributes, such as source address, destination address, protocol, port, key,
tunnel transport VRF, and tunnel mode.
Your software release may not support all the features documented in
this module. For the latest caveats and feature information, see
Bug Search Tool and the
release notes for your platform and software release. To find information about
the features documented in this module, and to see a list of the releases in
which each feature is supported, see the feature information table at the end
of this module.
Use Cisco Feature Navigator to find information about platform support
and Cisco software image support. To access Cisco Feature Navigator, go to
www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Both the GTP and PMIPv6 support multiple flows per tunnel. A
multiple-flow tunnel mechanism configures and manages multiple flows of traffic
within the same tunnel. Each flow is identified by a flow key. A flow
identifier or flow key is a 32-bit integer. The key is globally unique per
system for the GTP. However, the key can be unique per tunnel for PMIPv6. The
flow key for the GTP is the Tunnel Endpoint Identifier (TEID), and for PMIPv6,
it is the GRE key. Each flow has parameters to describe the per-flow
PMIPv6 uses a multipoint GRE tunnel per LMA, and creates one adjacency
per flow. An LMA can support scaling numbers up to 128,000 MAG. From the LMA
perspective, only one multipoint GRE tunnel interface is created and 128,000
tunnel endpoints are populated. This scaling level supports the MAG
functionality that is implemented on access points or hotspots, from which only
one or few PMIPv6 subscribers can be attached. Cisco high-end routing
platforms, such as the Cisco ASR 1000 Series Route Processor 2, the Cisco ASR
1000 Series 40-Gbps ESP, and the Cisco ASR 1000 Series 100-Gbps ESP support
128,000 scaling for the LMA.
To support 128,000 scaling, configure the following on the LMA:
ipv6 mobile pmipv6-lma LMA1 domain D1
bce maximum 128000
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to
www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 Feature Information
for Multiple-Flow Tunnel
Cisco IOS XE Release 3.9S
In Cisco IOS XE Release 3.9S, this feature was implemented on
the Cisco ASR 1000 Series Aggregation Services Routers.