Cisco ASA 5505 Configuration Manual page 900

GTP Inspection
Figure 40-1
The UMTS is the commercial convergence of fixed-line telephony, mobile, Internet and computer
technology. UTRAN is the networking protocol used for implementing wireless networks in this system.
GTP allows multi-protocol packets to be tunneled through a UMTS/GPRS backbone between a GGSN,
an SGSN and the UTRAN.
GTP does not include any inherent security or encryption of user data, but using GTP with the adaptive
security appliance helps protect your network against these risks.
The SGSN is logically connected to a GGSN using GTP. GTP allows multiprotocol packets to be
tunneled through the GPRS backbone between GSNs. GTP provides a tunnel control and management
protocol that allows the SGSN to provide GPRS network access for a mobile station by creating,
modifying, and deleting tunnels. GTP uses a tunneling mechanism to provide a service for carrying user
data packets.
When using GTP with failover, if a GTP connection is established and the active unit fails before data
Note
is transmitted over the tunnel, the GTP data connection (with a "j" flag set) is not replicated to the
standby unit. This occurs because the active unit does not replicate embryonic connections to the standby
unit.
Select GTP Map
The Select GTP Map dialog box lets you select or create a new GTP map. A GTP map lets you change
the configuration values used for GTP application inspection. The Select GTP Map table provides a list
of previously configured maps that you can select for application inspection.
Note
Cisco ASA 5500 Series Configuration Guide using ASDM
40-6
GPRS Tunneling Protocol
Home PLMN
MS
SGSN
Roaming partner
(visited PLMN)
GTP inspection requires a special license. If you try to enable GTP application inspection on a
adaptive security appliance without the required license, the adaptive security appliance displays
an error message.
Chapter 40 Configuring Inspection for Management Application Protocols
Internet
Gn
Corporate
GGSN Gi
network 2
Gp
Corporate
network 1
GRX
OL-20339-01