8.4 Device Mobility Configuration Elements

This topic describes the configuration elements that are used by Cisco Unified Communications Manager Device Mobility.

Configuration Element Name Configuration Element Function
Device Pool Defines a set of common characteristics for devices. The device pool contains only device- and location-related information. One device pool has to be assigned to each device.
Device Mobility Info Specifies an IP subnet and associates it with one or more device pools. Multiple device mobility infos can be associated with one device pool.
Physical Location The physical location is a tag assigned to one or more device pools. It is used to identify whether a device is roaming within a physical location or between physical locations.
Device Mobility Group The device mobility group is a tag assigned to one or more device pools. It is used to identify whether a device is roaming within a device mobility group or between device mobility groups.

The table lists the Device Mobility-related configuration elements and describes their function. The newly introduced elements are Device Mobility Infos, the Physical Location, and the Device Mobility Group.

The device mobility info is configured with a name and an IP subnet and is associated with one or more device pools. Multiple device mobility infos can be associated with the same device pool.

The physical location and the device mobility group are just tags; these elements are configured with a name only and do not include any other configuration settings. Both elements are nonmandatory device pool configuration parameters; that is, at the device pool, no physical location or one physical location and one (or no) device mobility group can be chosen. These parameters are used to determine whether two device pools are at the same physical location and in the same device mobility group.

Relationship of Device Mobility Configuration Elements

The figure illustrates how the Device Mobility configuration elements relate to each other.

The example in the figure shows five device mobility infos. They are configured as follows:

  • SJ1_dmi: The IP subnet of this device mobility info is 10.1.1.0/24. This device mobility info is used at Building A of the San Jose campus and is associated with device pool SJ_A_dp.
  • SJ2_dmi: The IP subnet of this device mobility info is 10.1.2.0/24. This device mobility info is used at Building B of the San Jose campus and is associated with device pool SJ_B1_dp.
  • SJ3_dmi: The IP subnet of this device mobility info is 10.1.3.0/24. Like SJ2_dmi, this device mobility info is used at Building B and is associated with device pool SJ_B1_dp. It is also associated with device pool SJ_B2_dp.
  • NY_dmi: The IP subnet of this device mobility info is 10.3.1.0/24. This device mobility info is used at the New York campus and is associated with device pool NY _dp.
  • LON_dmi: The IP subnet of this device mobility info is 10.10.1.0/24. This device mobility info is used at the London campus and is associated with device pool LON_dp.

Device pools SJ_A_dp, SJ_B1_dp, and SJ_B2_dp are configured with the same physical location (SJ_pl) because they are used for devices that are located at the San Jose campus.

Device pool NY_dp, serving the New York campus, is configured with physical location NY_pl, and device pool LON_dp, serving the London campus, is configured with physical location LON_pl.

All device pools that are assigned with a U.S. physical location (that is, SJ_A_dp, SJ_B1_dp, SJ_B2_dp, and NY_dp) are configured with device mobility group US_dmg. This setting means that all U.S. device pools are in the same device mobility group. The London campus is in a different device mobility group: GB_dmg.

In summary, the U.S. device mobility group consists of two physical locations: San Jose and New York. In San Jose, IP subnets 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24 are used; New York uses IP subnet 10.3.1.0/24, and London is configured with IP subnet 10.10.1.0/24.

Based on the IP address of an IP phone, the Cisco Unified Communications Manager can determine one or more associated device pool or pools and the physical location and device mobility group of the device pool or pools. If an IP phone uses an IP address of IP subnet 10.1.3.0/24, there are two candidates for the device pool. However, in this example, the physical location and the device mobility group are the same for these two device pools.

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