The SNMP Agent Administrative value of the subnet mask
for the out-band access.
This value is stored in the system NVRAM.
The current operational IP Adress may be obtained by
accessing the ipAdEntNetMask entry in the ipAddrTable,
for ipAdEntIfIndex equal to the SLIP interface value.
If the system has no current operational Out-Band IP
Address, meaning that, the access is done in-band,
then this value takes effect immediately.
Otherwise it will take effect after a system reset