Cisco Cisco 4G LTE Enhanced High-Speed WAN Interface Cards for Australia
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10. Mobile IP Enterprise-Managed Deployments
4G LTE brings mobility to enterprise deployments. It provides rapid deployment of the network to serve enterprise-
class data needs in areas where no wired infrastructure exists. Such areas are construction sites and temporary
deployments such as kiosks at events. All such requirements need a mechanism that quickly reacts to changes in
topology as well as having the lowest overhead possible. Mobile IP is designed to serve such situations, and it is
much more resilient to change in WAN access such as make/break of connection and change in connection point
while mobile. Mobile IP is also designed to use the bandwidth optimally while providing the dynamic routing
capabilities without the use of dynamic routing protocols. Mobile IP makes the end deployment simple to deploy
and manage.
mobile router. The home agent is an anchor point for all branch-office routers. All the branch-office routers act as
mobile routers and set up their Mobile IP tunnel to the home agent. The mobile router uses the Mobile IP tunnel as
a default route and informs the home agent about the private subnets connected to it on the LAN side as part of the
Mobile IP registration and Mobile IP tunnel setup. The home agent internally distributes this information in the
central-office network. This central-office network is called the home network, and it performs routing between the
endpoints that are connected to the mobile router and the central-office endpoints without the need for any
additional routing protocols over the 4G LTE WAN.
Mobile IP can have two types of deployments: service provider-managed and enterprise-managed. In a service
provider-managed connection, the service provider hosts the home agent in its core networks. This deployment
has an advantage in that the service provider can bridge the MPLS network and the 4G LTE connection by making
the home agent a service provider edge router on the MPLS side. In the enterprise-managed scenario, the home
agent is hosted by the enterprise. The advantage of this solution is that the enterprise has full control over the
Mobile IP tunnel and can use multiple service provider connections across different branch offices to connect back
to the enterprise network.
This section provides the configurations on the branch-office router as the mobile router and central-office router as
the home agent.
Note: For enterprise-managed Mobile IP to work, you must subscribe to a service with a static IP address on the
cellular interface. Normal 4G LTE connections are provided with a dynamic private IP address, which cannot be
cellular interface. Normal 4G LTE connections are provided with a dynamic private IP address, which cannot be
used for the mobile node association on the home agent side in enterprise headquarters. Cellular service providers
provide static IP addresses on 4G LTE interfaces as a separate service.