# SGSN Pool Area Configuration Mode Commands

The Pool Area configuration mode configures the parameters used to setup the VLRs to use with a pool area in a Gs service.
With this mode, the command prompt will be similar to:

    [ctx_name]hostname(config-gs-pool-area)#

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:

SGSN
Privilege:

Security Administrator, Administrator
Syntax

    end

Usage:

Return to the Exec mode.
exit

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

SGSN
Privilege:

Security Administrator, Administrator
Syntax

    exit

Usage:

Return to the previous configuration mode.
hash-value

This command configures the load distribution for the VLRs that service this pool area.
Platform:

ASR 5000
Product:

SGSN
Privilege:

Security Administrator, Administrator
Syntax

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

no

Removes the configured Gs procedures from this Gs service.
hash_value

Specifies the specific hash value for VLR(s).

hash_value must be an integer value from 0 through 999.
range start_value to end_value

Specifies the range of hash values for a VLR.

start_value specifies the start value for range of hash and is an integer value from 0 through 999. start_value must be lower than end_value.

end_value specifies the end value for range of hash and is an integer value from 0 through 999. end_value must be higher than start_value.
non-configured-values

This keyword assign all non-configured hash values to use the named VLR.
use-vlr vlr_name

Specifies the name of the VLR to be associated with this pool area.

vlr_name is the name of VLR and must be an alpha and/or numeric string of 1 to 63 characters.
Usage:

Use this command to command configures the load distribution for the VLRs that service this pool area as defined in TS 23.236.

The algorithm for selection of VLR from a pool area is based on the hash value computed on the IMSI digits. The SGSN derives a hash value (V) using procedure as defined in TS 23.236. Every hash value from the range 0 to 999 corresponds to a single MSC/VLR node. Typically many hash values may point to the same MSC/VLR node.

This command can be entered multiple times for different hash value.
Example:
Following command configure the all non configured hash values to use VLR named starvlr1 in this pool area:

    hash-value non-configured-values
    use-vlr  starvlr1

lac

This command defines a set of location area code (LAC) values for a pool area.
Platform:

ASR 5000
Product:

SGSN
Privilege:

Security Administrator, Administrator
Syntax

    lac lac_id +no lac lac_id

no

Removes the configured LAC value from this pool area configuration.
lac lac_id

Specifies the subscribers’ location area code (LAC) to be associated with this pool area and a specific VLR. This LAC is obtained from the radio area identity (RAI).

lac_id: Must be an integer from 1 through 65535.
+

More than one lac_id, separated by a space, can be entered within a single command.
Usage:

Use this command to specify a set of LACs to use for a pool area.

This command can be entered multiple times, subject to a limit of 32 LAC definitions (total for non-pool-area and pool-area configuration) per Gs service.

IMPORTANT:

LAC values across multiple pool areas and non-pool-areas must be unique within the Gs service.
Example:
The following command configures LACs 101, 301, and 222 for the pool area.

    lac 101 301 222