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Viewing the Local Mobility Anchor Configuration (LMA), page 27-161
Monitoring the SaMOG Gateway Configuration, page 27-166
Monitoring System Architecture Evolution Networks (SAE-GW)
Systems Architecture Evolution (SAE) has a flat all-IP architecture with separation of control plane and 
user plane traffic. The main component of SAE architecture is the Evolved Packet Core (EPC), also 
known as SAE Core. The EPC serves as an equivalent to GPRS networks by using its subcomponents 
Mobility Management Entities (MMEs), Serving Gateway (S-GW), and PDN Gateway (P-GW).
Mobility Management Entity (MME)
MME is the key control node for a Long Term Evolution (LTE) access network. It is responsible for idle 
mode User Equipment (UE) tracking and paging procedure including retransmissions. It is involved in 
the bearer activation/deactivation process and is also responsible for choosing the S-GW for a UE at the 
initial attach and at time of intra-LTE handover involving Core Network (CN) node relocation. The 
MME also provides the control plane function for mobility between LTE and 2G/3G access networks 
with the S3 interface terminating at the MME from the SGSN. 
Serving Gateway (S-GW)
The S-GW routes and forwards user data packets, while also acting as the mobility anchor for the user 
plane during inter-eNodeB handovers and as the anchor for mobility between LTE and other 3GPP 
technologies. For idle state UEs, the S-GW terminates the downlink data path and triggers paging when 
downlink data arrives for the UE. It manages and stores UE contexts, such as parameters of the IP bearer 
service, network internal routing information, and so on. It also performs replication of the user traffic 
in case of lawful interception. For more information, see Working with Serving Gateway (S-GW), 
page 27-92.
PDN Gateway (P-GW)
The P-GW provides connectivity from the UE to external packet data networks by being the point of exit 
and entry of traffic for the UE. A UE may have simultaneous connectivity with more than one P-GW for 
accessing multiple PDNs. The P-GW performs policy enforcement, packet filtering for each user, 
charging support, lawful interception, and packet screening. Another key role of the P-GW is to act as 
the anchor for mobility between 3GPP and non-3GPP technologies such as WiMAX and 3GPP2. For 
more information, see Working with PDN-Gateways (P-GW), page 27-88.
Running S-GW and P-GW services together as a SAE-GW provides the following benefits:
Higher capacity—For a UE with one PDN connection that is passing through standalone S-GW and 
P-GW services consumes 2 license units because both S-GW and P-GW services account for it 
separately. SAE-GW as a single node consumes only one license unit for the same, thus increasing 
the capacity. 
Cohesive configuration—Configuration and management of SAE-GW as a node is simpler to follow 
and logical to explain.
See Viewing SAE-GW Properties, page 27-87 for details on how to view SAE-GW properties in the 
Vision client.
Viewing SAE-GW Properties
The Vision client displays the SAE-GWs in a SAE-GW container under the Mobile node in the logical 
inventory. The icon used for representing SAE-GW in the logical inventory is explained in NE Logical 
Inventory Icons, page A-7. 
						

							  
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To view SAE-GW properties:
Step 1Right-click the required device in the Vision client and choose Inventory.
Step 2In the Logical Inventory window, choose Logical Inventory > Context> Mobile > SAE-GW 
Container.
The Vision client displays the list of SAE-GW services configured under the container. You can view the 
individual SAE-GW service details from the table on the right pane or by choosing Logical Inventory > 
Context> Mobile > SAE-GW Container> SAE-GW.
Table 27-56 describes the details available for each SAE-GW.
SAE-GW Commands
The following SAE-GW commands can be launched from the inventory by right-clicking a SAE-GW 
and choosing Commands > Configuration. Your permissions determine whether you can run these 
commands (seePermissions Required to Perform Tasks Using the Prime Network Clients, page B-1). To 
find out if a device supports these commands, see the Cisco Prime Network 4.3.2 Supported Cisco VNEs. 
Working with PDN-Gateways (P-GW)
A PDN Gateway (P-GW) is the node that terminates the SGi interface towards the PDN. If a user 
equipment (UE) is accessing multiple PDNs, there may be more than one P-GW for that UE. The P-GW 
provides connectivity to the UE to external packet data networks by being the point of exit and entry of 
traffic for the UE. A UE may have simultaneous connectivity with more than one P-GW for accessing 
multiple PDNs. 
Table 27-56 SAE-GW Properties in Logical Inventory
Field Description
Service Name Name of the SAE-GW service. 
Service ID ID of the SAE-GW service.
Status Status of the SAE-GW service.
P-GW Service The P-GW service associated with the SAE-GW.
S-GW Service The S-GW service associated with the SAE-GW.
New Call Policy Specifies if the new call related behavior of SAE-GW service is enabled or 
disabled, when duplicate sessions with same IP address request is received.
Table 27-57 SAE-GW Commands
Command Navigation Description
Create SAE GWLogical Inventory > right-click the 
context> Commands> ConfigurationUse this command to create SAE 
GW.
Delete SAE GWRight-click the SAE GW> Commands> 
ConfigurationUse this command to delete or 
modify the configuration details for 
a SAE GW. Modify SAE GW 
						

							  
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The P-GW facilitates policy enforcement, packet filtering for each user, charging support, lawful 
interception, and packet screening. The features of P-GW include:
Integration of multiple core network functions in a single node
Multiple instances of P-GW can enable call localization and local breakout
High performance across all parameters like, signaling, throughput, density, and latency 
Integrated in-line services
Support for enhanced content charging, content filtering with blacklisting, dynamic network-based 
traffic optimization, application detection and optimization, stateful firewall, NAT translation, and 
lawful intercept
High-availability helps to ensure subscriber satisfaction
The following topics explain how to work with P-GW in the Vision client:
Viewing P-GW Properties, page 27-89
P-GW Commands, page 27-92
Viewing P-GW Properties
The Vision client displays the P-GWs in a P-GW container under the Mobile node in the logical 
inventory. The icon used for representing P-GW in the logical inventory is explained in NE Logical 
Inventory Icons, page A-7.
To view P-GW properties:
Step 1Right-click the required device in the Vision client and choose Inventory.
Step 2In the Logical Inventory window, choose Logical Inventory > Context> Mobile > P-GW Container.
The Vision client displays the list of P-GW services configured under the container. You can view the 
individual P-GW service details from the table on the right pane or by choosing Logical Inventory > 
Context> Mobile > P-GW Container> P-GW.
Table 27-58 describes the details available for each P-GW.
Table 27-58 P-GW Properties in Logical Inventory
Field Description
Service Name Name of the P-GW service. 
Service Status Status of the P-GW service.
EGTP Service Evolved GPRS Tunneling Protocol (EGTP) service associated with the 
P-GW. EGTP provides tunneling support for the P-GW.
GGSN Service GGSN service associated with the P-GW.
LMA Service Local Mobility Anchor (LMA) that facilitates proxy mobile IP on the P-GW.
QCI QoS Mapping 
Ta b l e  N a m eTable name of QoS class indices that enforce QoS parameters.
New Call Policy Specifies if the new call related behavior of P-GW service is enabled or 
disabled, when duplicate sessions with same IP address request is received.
Session Delete Delay 
TimeoutDuration, in seconds, to retain a session before terminating it. 
						

							  
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SAE-GW Service Systems Architecture Evolution (SAE) gateway service associated with the 
P-GW.
Setup Timeout The timeout (duration in seconds) for setting up the session. Ranges from 1 
to 120. Default is 60 seconds. 
GTPC Load Control 
ProfileSpecifies the GTPC load control profile for the P-GW service.
GTPC Overload Control 
ProfileSpecifies the GTPC overload control profile for the P-GW service.
GTPC Cause Code 
MappingSpecifies the GTPC cause code mapping for the P-GW service.
PCSCF Restoration 
SolutionSpecifies the mechanism to support PCSCF restoration, which can be one of 
the following: HSS-based (Private Extension) and HSS-based (Release12).
Throttling Override Specifies throttling override.
Throttling Override 
PolicySpecifies the throttling override policy.
Message Timestamp 
DraftDisplays the message timestamp for the P-GW service.
Duplicate Subscriber 
Addr Request IPV6Shows how duplicate sessions with same IPv6 address request are 
configured. The default configuration disables the support to accept 
duplicate v6 address request.
Internal Qos 
ApplicationSpecifies whether the internal Qos application is enabled or disabled for 
P-GW service.
Event Reporting Shows reporting of events.
Internal Qos Policy Specifies the internal Qos policy for P-Gw service.
DNS Client Context 
NameDisplays the DNS client context name for P-Gw service.
Gx-Li Context Displays Gx LI X3 interface context that is associated with the service.
Gx-Li Transport Displays Gx LI X3 interface content delivery transport. Default transport is 
UDP.
Authorize This command enables or disables subscriber session authorization through 
a Home Subscriber Server (HSS) over an S6b Diameter interface. This 
feature is required to support the interworking of GGSN with P-GW and HA.
S6b IPV6 Reporting Enables ipv6 reporting through AAR towards s6b interface.
Fqdn Name Designates PGW FQDN host and realm as a string between 1 and 255 
alpha-numeric characters.
Subscriber Map Name The subscriber map name associated with the P-GW service is available or 
not.
Session Delete Delay 
TimerThe session delete timeout.
Retain MDN Shows the retained value of either MSISDN or MDN value retained, which 
is negotiated during the call setup for the lifetime of call.
Table 27-58 P-GW Properties in Logical Inventory (continued)
Field Description 
						

							  
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Step 3If the P-GW is associated with PLMNs, you can view the details of the PLMNs on clicking the specified 
P-GW.
eGTP Characteristics
The Vision client displays the EGTP characteristics in an EGTP container under the Mobile node in the 
logical inventory. The icon used for representing EGTPs in the logical inventory is explained in NE 
Logical Inventory Icons, page A-7.
To view EGTP characteristics:
Step 1Right-click the required device in the Vision client and choose Inventory.
Step 2In the Logical Inventory window, choose Logical Inventory > Context> Mobile > EGTP 
Characteristics.
Table 27-59 describes the EGTP Characteristics.
Ta b l e 2 7 - 5 9EGTP Characteristics P-CSCF Restoration 
Supported for 
Emergency PDNsEnables P-CSCF restoration for emergency PDNs.
Re-Auth After s6b 
Triggered P-CSCF 
RestorationEnables Re-Auth after S6b triggered P-CSCF restoration of WLAN. This is 
applicable only for S2a and S2b.
NoteBy default, Re-Auth is performed for P-CSCF restoration extension 
on S6b.
Table 27-58 P-GW Properties in Logical Inventory (continued)
Field Description
Field Description
Overcharging Properties Overcharge protection is described as temporarily 
not charging during loss of radio coverage.
Drop Policy The drop policy is enabled while over charging 
protection is enabled. There are two drop policies: 
drop-all —Configures overcharge protection 
to drop all packets.
received transmit-all —Configures 
overcharge protection to send all received 
packets 
SGW Restoration Handling Configuration is related to SGW-restoration. 
Session Hold Timer Session time hold for SGW-restoration. It can be 
configured only when SGW-restoration is 
enabled. 
Timeout It specifies session hold timer in seconds when the 
SGW-restoration is enabled. Value range: 1 - 3600 
						

							  
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P-GW Commands
The following P-GW commands can be launched from the inventory by right-clicking a P-GW and 
choosing Commands > Configuration. Your permissions determine whether you can run these 
commands (see Permissions Required to Perform Tasks Using the Prime Network Clients, page B-1). To 
find out if a device supports these commands, see the Cisco Prime Network 4.3.2 Supported Cisco VNEs. 
Working with Serving Gateway (S-GW)
In a Long Term Evolution (LTE) / Systems Architecture Evolution (SAE) network, a Serving Gateway 
(S-GW) acts as a demarcation point between the Radio Access Network (RAN) and core network, and 
manages user plane mobility. It serves as the mobility anchor when terminals move across areas served 
by different eNode-B elements in Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), as 
well as across other 3GPP radio networks such as GSM EDGE Radio Access Network(GERAN) and 
UTRAN. S-GW buffers downlink packets and initiates network-triggered service request procedures. 
Other functions include lawful interception, packet routing and forwarding, transport level packet 
marking in the uplink and the downlink, accounting support for per user, and inter-operator charging. 
The S-GW routes and forwards user data packets, while also acting as the mobility anchor for the user 
plane during inter-eNode-B handovers and as the anchor for mobility between LTE and other 3GPP 
technologies. Modify Bearer Cmd Negotiate QoS It prefers PCRF Authorized QoS rather than 
Requested QoS in Modify-bearer-command 
procedure.
Bit Rate in Rounded Down Kbps The rounded down Kbps value of Bit Rate is 
enabled or disabled on GTP interface.
Suppress Update Bearer Request Enables the P-GW to suppress the Update Bearer 
Request (UBR) message UBR, if the bit rate is the 
same after the round-off.
EGTP Cause Code Handling Enables eGTP Cause Code Handling when the 
P-GW receives a temporary failure response from 
peer (cause code 110).
NoteAll transactions that are moved to a 
pending queue due to temporary cause 
failure is re-attempted. Field Description
Table 27-60 P-GW Commands
Command Navigation Description
Create P-GW PLMNRight-click the P-GW 
service> Commands> 
Configuration > 
MobilityUse this command to create a PLMN for P-GW.
Delete P-GWUse this command to delete a P-GW.
Modify P-GWUse this command to modify the configuration 
details for a P-GW. 
						

							  
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For idle state user equipment (UE), the S-GW terminates the downlink data path and triggers paging 
when downlink data arrives for the UE. It manages and stores UE contexts, such as parameters of the IP 
bearer service, network internal routing information, and so on. It also performs replication of the user 
traffic in case of lawful interception.
The following topics provide details on how to work with S-GWs in the Vision client:
Viewing S-GW Properties, page 27-93
S-GW Commands, page 27-95
Viewing S-GW Properties
The Vision client displays the S-GWs in a S-GW container under the Mobile node in the logical 
inventory. The icon used for representing S-GW in the logical inventory is explained in NE Logical 
Inventory Icons, page A-7.
To view S-GW properties:
Step 1Right-click the required device in the Vision client and choose Inventory.
Step 2In the Logical Inventory window, choose Logical Inventory > Context> Mobile > S-GW Container.
The Vision client displays the list of S-GW services configured under the container. You can view the 
individual S-GW service details from the table on the right pane or by choosing Logical Inventory > 
Context> Mobile > S-GW Container> S-GW.
Table 27-61 describes the details available for each S-GW.
Table 27-61 S-GW Properties in Logical Inventory
Field Description
Service Name Name of the S-GW service.
Service Status Status of the S-GW service.
Accounting Context Name of the context configured on the system that processes accounting for 
service requests handled by the S-GW service.
Accounting GTPP 
GroupName of the accounting GTPP group associated with the S-GW service. This 
will hold the configured GTPP server group (for GTPP servers redundancy) 
on a S-GW service for CGF accounting functionality.
Accounting Mode Accounting protocol, which could be GTPP or Radius-Diameter.
Egress  Protocol Egress protocol used for the S-GW service, which could be GTP, GTP-PMIP, 
or PMIP.
Ingress EGTP Service Ingress EGTP service associated with the S-GW. EGTP provides tunneling 
support for the S-GW.
Egress Context Context used for S-GW service egress.
Egress ETGP Service Ingress EGTP service associated with the S-GW. EGTP provides tunneling 
support for the S-GW.
Egress Mag Service Mobile Access Gateway (MAG) egress service through calls are routed to 
the S-GW.
IMS Authorization 
ServiceIMS authorization service associated with the S-GW.
Accounting Policy Accounting policy configured for the S-GW. 
						

							  
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Step 3Choose Logical Inventory > Context> Mobile > S-GW Container > S-GW > DDN Throttling 
Characteristics.
Table 27-62 describes the details of DDN throttling characteristics for each S-GW. New Call Policy Specifies if the new call related behavior of S-GW service is enabled or 
disabled, when duplicate sessions with same IP address request is received.
QCI QoS Mapping 
Ta b l eTable name of QoS class indices that enforce QoS parameters.
SAE GW Service Systems Architecture Evolution (SAE) gateway service associated with the 
S-GW.
Idle Timeout The maximum duration a session can remain idle in seconds. Default value 
is 0.
Idle Timeout Micro 
Checkpoint PeriodicitySpecifies the micro checkpoint periodicity for the S-GW service.
GTPC Load Control 
ProfileSpecifies the GTPC load control profile for the S-GW service.
GTPC Overload Control 
ProfileSpecifies the GTPC overload control profile for the S-GW service.
Internal Qos PolicySpecifies the internal Qos policy for the S-GNW service.
Internal Qos 
ApplicationSpecifies the internal Qos application for the S-GNW service.
Event Reporting Shows reporting of events.
Subscriber Map Name Specifies subscriber map name associated with the S-GW service.
Table 27-61 S-GW Properties in Logical Inventory (continued)
Field Description
Table 27-62 DDN Throttling Characteristics for S-GW
Field Description
Throttling Specifies the status of the DDN throttling characteristics. The status can be 
Enabled or Disabled.
Feature Packet Drop 
TimeSpecifies the feature packet drop time for the S-GW service.
Arp  Watermark Specifies the throttle ARP watermark. If the arp watermark is configured and 
if an MME/SGSN sends the throttling factor and delay in a DDN ACK 
message, all the DDNs, which have an ARP value greater than the configured 
value will be throttled by the throttle factor for the specified delay.
Increment Factor Specifies the percentage by which the DDN throttling should be increased.
Rate Limit Specifies the rate limit. 
Time Factor Specifies time duration during which the S-GW makes throttling decisions.
Stab Time in Hours Specifies time period in hours over which the system is stabilized, throttling 
will be disabled.
Throttle Time In Hours Specifies DDN throttling time in hours.  
						

							  
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Step 4If the S-GW is associated with PLMNs, you can view the PLMN entries on clicking the specified S-GW.
S-GW Commands
The following S-GW commands can be launched from the inventory by right-clicking an S-W and 
choosing Commands > Configuration. Your permissions determine whether you can run these 
commands (see Permissions Required to Perform Tasks Using the Prime Network Clients, page B-1). To 
find out if a device supports these commands, see the Cisco Prime Network 4.3.2 Supported Cisco VNEs. 
Viewing QoS Class Index to QoS (QCI-QoS) Mapping
The QoS Class Index (QCI) to QoS mapping configuration mode is used to map Indexes to enforceable 
QoS parameters. Mapping can occur between the RAN and the S-GW, the MME, and/or the P-GW in an 
LTE network or between the RAN and the harped Serving Gateway (HSGW) in an eHRPD network. This 
is a global configuration. These maps can be imported by P-gateway and S-gateway to enforce these 
parameters on upstream/downstream traffic.
The Vision client displays the QCI-QoS mapping information under the Mobile node in the logical 
inventory. See Figure 27-21.
NoteQCI-QoS mapping is applicable only for the ‘local’ context in the logical inventory.Success Action Retry 
TimeSpecifies the success action retry time for the S-GW service.
ISR Sequential Paging 
Delay TimeSpecifies the ISR sequential paging delay time for the S-GW service.
Throttle Factor Specifies the DDN throttling factor. 
Poll Interval Specifies the polling interval in DDN throttling.
Stab Time In Seconds Specifies the DDN throttling stabilization time in seconds.
Throttle Time In 
SecondsSpecifies the DDN throttling time in seconds.
Stab Time in Minutes Specifies the DDN throttling stabilization time in minutes.
Throttle Time in 
Minutes Specifies the DDN throttling time in minutes.
Table 27-62 DDN Throttling Characteristics for S-GW (continued)
Field Description
Table 27-63 S-GW Commands
Command Navigation Description
Create S-GW PLMNRight-click the S-GW 
service> Commands> 
ConfigurationUse this command to create a PLMN for 
S-GW.
Delete S-GWUse this command to delete a S-GW.
Modify S-GWUse this command to modify the 
configuration details for a S-GW. 
						

							  
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To view QCI-QoS mapping:
Step 1Right-click the required device in the Vision client and choose Inventory.
In the Logical Inventory window, choose Logical Inventory > local> Mobile > QCI-QoS Mapping.
the Vision client displays the list of QCI-QoS mapping records configured under the container. You can 
view the individual record from the table on the right pane or by choosing Logical Inventory > 
Context> Mobile > QCI-QoS Mapping > Mapping Name.
Table 27-64 describes the QCI-QoS mapping details.
Viewing Layer 2 Tunnel Access Concentrator Configurations (LAC)
In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support 
virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any 
encryption or confidentiality by itself; it relies on an encryption protocol that it passes within the tunnel 
to provide privacy. The entire L2TP packet, including payload and L2TP header, is sent within a User 
Datagram Protocol (UDP) datagram. It is common to carry Point-to-Point Protocol (PPP) sessions within 
an L2TP tunnel.
The two endpoints of an L2TP tunnel are called the LAC (L2TP Access Concentrator) and the LNS 
(L2TP Network Server). The LAC is the initiator of the tunnel while the LNS is the server, which waits 
for new tunnels. Once a tunnel is established, the network traffic between the peers is bidirectional.
LAC allows users and telecommuters to connect to their corporate intranets or extranets using L2TP. In 
other words, it forwards packets to and from the LNS and a remote system. It connects to the LNS using 
a local area network or wide area network and directs subscriber sessions into L2TP tunnels based on 
the domain of each session. Figure 27-6 denotes the LAC architecture.
Table 27-64 QCI-QoS Mapping
Field Description
Mapping Name Name of the QCI-QoS mapping record.
QCI-QoS Mapping Table
QCI Number QCI number.
QCI Type QCI type.
Uplink DSCP marking to be used for encapsulation and UDP for uplink traffic
Downlink DSCP marking to be used for encapsulation and UDP for downlink traffic
Max Packet Delay Maximum packet delay, in milliseconds, that can be applied to the data.
Max Error Rate Maximum error loss rate of non congestion related packet loss.
Delay Class Packet delay.
Precedence Class Indicates packet precedence.
Reliability Class Indicates packet reliability.
Traffic Policing Interval Traffic policing interval.