Cisco Cisco Packet Data Gateway (PDG)
SaMOG Gateway Overview
▀ Features and Functionality - License Enhanced Feature Software
▄ SaMOG Administration Guide, StarOS Release 17
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The APN provided by the AAA server is mapped to the locally configured P-GW or GGSN service IP. This eliminates
the need for a DNS. The local P-GW or local GGSN assigns the IP using a locally configured IP pool after receiving the
subscriber information from the AAA server. The subscriber information is received from the SaMOG service to the
local P-GW service or local GGSN service through a GTP tunnel. This tunnel is set up within the same chassis.
the need for a DNS. The local P-GW or local GGSN assigns the IP using a locally configured IP pool after receiving the
subscriber information from the AAA server. The subscriber information is received from the SaMOG service to the
local P-GW service or local GGSN service through a GTP tunnel. This tunnel is set up within the same chassis.
The SaMOG Gateway decides whether an APN should be locally broken out based on the following parameters:
A configuration in the APN profile indicating if LBO is enabled for the APN
Whether a “DEA-Flags” is received in the DEA messages on the STa interface. If DEA-Flags are received,
SaMOG will verify if the “NSWO-Authorization” flag is set.
If the APN profile is configured for LBO, and either no “DEA-Flags” are received in the DEA messages, or “DEA-
Flags” is received with the “NSWO-Authorization” flag set, SaMOG performs LBO for that APN.
Flags” is received with the “NSWO-Authorization” flag set, SaMOG performs LBO for that APN.
LBO Decision based on AAA Policy and Local Policy
The decision on whether LBO can be done for a call is based on the following factors:
A DIAMETER-based server can provide the following information:
The MIP6_FEATURE_VECTOR AVP in DEA message can have the GTPV2_SUPPORTED flag set
to indicate that the AAA server authorizes the GTP call through the EPC core (GGSN/PGW).
The Bit 0 of the DEA_FLAG AVP (NSWO Authorization) is set to indicate that LBO is authorized for
a session by the AAA server.