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.