# MME LAC Pool Area Configuration Mode Commands

The MME LAC Pool Area Configuration Mode is used to create and manage the Location Area Code (LAC) pool areas.

IMPORTANT:

The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
end

Exits the current configuration mode and returns to the Exec mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    end

Usage:

Use this command to return to the Exec mode.
exit

Exits the current mode and returns to the parent configuration mode.
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    exit

Usage:

Use this command to return to the parent configuration mode.
hash-value

Configures the Visitor Location Register (VLR) hash value mapping for this pool area.
Platform:

ASR 5000
Product:

MME
Privilege:

Administrator
Syntax

    hash-value { value | non-configured-values | range value to value } use-vlr vlr_nameno hash-value { value | non-configured-values | range value to value }

no

Removes the configured hash-value from the pool-area configuration.
value

Specifies the VLR hash value to be used with the configured VLR. value must be an integer from 0 through 999.
non-configured-values

Specifies that the VLR configured in this command is to be used non-configured hash values.
range value to value vlr_name

Specifies a range of hash values to use with the configured VLR as an integer from 0 through 999.
use-vlr

Specifies the VLR to be used with the hash value configuration in this command.
Usage:

Use this command to configure hash values to be used with VLRs.

In Release 12.2 and later, a maximum of 48 hash lists can be created per pool area. In older releases, a total of 32 hash lists can be created per pool area.

In a pool configuration, the MME selects the VLR that corresponds to the hash of the UE’s IMSI. If that VLR is inactive, the MME will use the default VLR (as defined by the non-configured-value option). If no default VLR has been configured, or if the default VLR is inactive, the MME selects any other available VLR from the pool.

If the chosen VLR is active at the time of selection and then subsequently becomes inactive when the request is sent to it, the current request fails. On the next request from the UE, the VLR selection mechanism is applied again. A VLR that failed previously will only be selected again if it became active since the earlier failure.
Example:
The following command configures all hash values within a range of 0 to 500 to use a VLR named vlr1:

    hash-value range 0
    to 500 use-vlr vlr1

The following command configures hash values of 501 to use a VLR named vlr2:

    hash-value 501 use-vlr vlr2

The following command configures all non-configured hash values to use a VLR named vlr3:

    hash-value non-configured-values
    use-vlr vlr3

lac

Configures a 3G location area code or area codes that define this pool area.
Platform:

ASR 5000
Product:

MME
Privilege:

Administrator
Syntax

    [ no ] lac { area_code } +

no

Removes a configured forbidden handover area code or area codes from this policy. If no location area code is specified, then all location area codes are removed.
area_code

Specifies an area code or area codes used to select a VLR for the pool area as an integer from 0 through 65535. Multiple area codes can be entered (up to 16 in a single line, separated by spaces).
Usage:

Use this command to configure 3G location-based area codes that define this pool area.

In Release 12.2 and later, a maximum of 96 areas can be added per pool area (in a single line, or separately). In older releases, a total of 16 area codes can be added (in a single line, or separately).
Example:
The following command configures eight location-based area codes (1, 2, 3, 4, 5, 6, 7, 8) that define this pool area:

    lac 1 2 3 4 5 6 7 8