GTPP Interface Configuration

Configuring the GPRS Tunneling Protocol

Cisco Systems’ GGSN/P-GW/S-GW supports both GTPP- and RADIUS-based accounting. The accounting protocol is configured on a per-APN basis.

When the GTPP protocol is used, accounting messages are sent to the Charging Gateways (CGs) over the Ga interface. The Ga interface and GTPP functionality are typically configured within the system's source context. As specified by the standards, a CDR is not generated when a session starts. CDRs are generated according to the interim triggers configured using the charging characteristics configured for the GGSN, and a CDR is generated when the session ends. For interim accounting, STOP/START pairs are sent based on configured triggers.

GTPP version 2 is always used. However, if version 2 is not supported by the Charging Gateway Function (CGF), the system reverts to using GTPP version 1. All subsequent CDRs are always fully-qualified partial CDRs. GTPP version 0 is not supported.

GTPP is configured at the routing context level. Some of the configurables associated with GTPP are Attributes, Charging Agent, Deadtime, etc. The GTPP configuration commands vary according to the services configured, for example, the commands used for GGSN might differ from what is configured for P-GW. For more information on the configuration commands, refer to the Command Line Interface Reference.

This section provides the GTPP configuration applied to various products.

IMPORTANT:

Commands used in the configuration examples in this section provide base functionality to the extent that the most common or likely commands and/or keyword options are presented. In many cases, other optional commands and/or keyword options are available. Refer to the Command Line Interface Reference for complete information regarding all commands.

Configuring GTPP for GGSN/P-GW

This section provides the GTPP configuration for GGSN and P-GW.

Configure the GTPP group and accounting context configuration in APN level and also specify the accounting mode.
```
configure
```
```
   context source
```
```
      apn apnname1.com
```
```
      accounting-mode gtpp
```
```
      gtpp
group group1 accounting-context
billing
```
```
      end
```
IMPORTANT:
To generate only an eG-CDR, the accounting-mode command in the APN Configuration mode must be configured with the none option.

Configure the GTPP group related parameters like GTPP server parameters, GTPP dictionary, and optionally CGF to support GTPP accounting:

configure

   context source

      gtpp
group group1

      gtpp
charging-agent address 1.2.3.4 port 3386

      gtpp
server 1.3.5.6 max msgs priority 1

      gtpp
dictionary dict1

      gtpp
max-cdr 255 wait-time 10

      gtpp
transport-layer udp

end

IMPORTANT:

For GGSN, accounting context can also be configured in GGSN service. In this case more priority will be given to the APN level configuration. In APN level, if no accounting context is configured then accounting context configured in GGSN service will be considered.

configure

   context source

      ggsn-service ggsn1

      accounting
context billing

end

Configuring GTPP for PDG and TTG

This section provides the GTPP configuration for PDG.

At the APN level configure GTPP in the accounting-mode.

configure

   context dest1

      apn apn_name

      accounting-mode gtpp

      gtpp
group group1 accounting-context pdg

end

At the context level configure the accounting policy. This is required only for time/tariff/volume threshold configuration.

configure

   context dest1

      policy
accounting acct1

        cc
profile 1 interval 60

        cc
profile 1 volume total 100000

        cc
profile 1 tariff time  1 0 0 time 2 2 2 time 3 4 4 time 4 5 5

        cc
profile 1 buckets 3

        cc
profile 1 serving-nodes 4

end

Associate the accounting policy with the PDG service.

configure

   context source

      pdg-service pdg1

      associate
accounting-policy acct1

end

Configure the GTPP group related parameters and CDR attributes/triggers.

configure

   context source

      gtpp
group group1

      gtpp
charging-agent address 1.2.3.4 port 3386

      gtpp
server 1.3.5.6 max msgs priority 1

      gtpp
dictionary dict1

      gtpp
max-cdr 255 wait-time 10

      gtpp
transport-layer udp

      gtpp
trigger volume-limit

      gtpp
attribute local-record-sequence-number

end

This section provides the GTPP configuration for TTG.

At the subscriber level configure GTPP in the accounting-mode.

configure

   context dest1

      subscriber
default

       accounting-mode gtpp

end

At the context level configure the accounting policy. This is required only for time/tariff/volume threshold configuration.

configure

   context dest1

      policy
accounting acct1

        cc
profile 1 interval 60

        cc
profile 1 volume total 100000

        cc
profile 1 tariff time  1 0 0 time 2 2 2 time 3 4 4 time 4 5 5

        cc
profile 1 buckets 3

        cc
profile 1 serving-nodes 4

end

Associate the accounting policy with the TTG service.

configure

   context source

      pdg-service pdg1

      accounting
context pdg

      associate
accounting-policy acct1

end

Configure the GTPP group related parameters and CDR attributes/triggers.

configure

   context source

      gtpp
group default

      gtpp
charging-agent address 1.2.3.4 port 3386

      gtpp
server 1.3.5.6 max msgs priority 1

      gtpp
dictionary dict1

      gtpp
max-cdr 255 wait-time 10

      gtpp
transport-layer udp

      gtpp
trigger volume-limit

      gtpp
attribute rat

end

Configuring GTPP for S-GW

This section provides the GTPP configuration for S-GW.

At the subscriber level configure GTPP in the accounting-mode.

configure

   context dest1

      subscriber default

      accounting-mode gtpp

end

At the context level configure the accounting policy. This is required only for time/tariff/volume threshold configuration.

configure

   context dest1

      policy
accounting lte

      cc
profile 1 interval 60

      cc
profile 1 volume total 100000

      cc
profile 1 tariff time  1 0 0 time 2 2 2 time 3 4 4 time 4 5 5

      cc
profile 1 buckets 3

      cc
profile 1 serving-nodes 4

end

Associate the accounting policy with the S-GW service.

configure

   context source

      sgw-service sgw1

      associate
accounting-policy lte

end

Configure the accounting context and GTPP group in S-GW service level. If accounting context is not configured in S-GW service the source context and "default" GTPP group will be selected.
```
configure
```
```
   context source
```
```
      sgw-service sgw1
```
```
      accounting
context dest1 gtpp group sgw
```
```
      end
```

Configure the GTPP group related parameters.

configure

   context source

      gtpp
group group1

      gtpp
charging-agent address 1.2.3.4 port 3386

      gtpp
server 1.3.5.6 max msgs priority 1

      gtpp
dictionary dict1

      gtpp
max-cdr 255 wait-time 10

      gtpp
transport-layer udp

end

Configuring GTPP for SGSN

This section provides the GTPP configuration for SGSN.

At the local context level, configure the system to reserve a CPU for performing a AAA proxy function for accounting.

configure

   context local

      gtpp
single-source private-extensions

end

When gprs-service and sgsn-service are configured in source context, configure the GTPP group related parameters like GTPP server parameters, GTPP dictionary, and optionally CGF to support GTPP accounting:
```
configure
```
```
   context source
```
```
      gtpp
group default
```
```
      gtpp
charging-agent address 192.168.10.10 
```
```
      gtpp
server 192.168.10.2 priority 1 max 1 
```
```
      gtpp
dictionary custom10
```
```
      end
```
IMPORTANT:
The above configuration is applicable for the transfer of generated CDRs to the CGF server over GTPP protocol. Configuration varies slightly if GSS/HDD is used for transferring/storing CDRs.

Sample Configuration for SGSN when HDD is Used

When internal HDD is enabled for storage of generated CDRs, AAA proxy should use the configuration from GTPP group for File Format/GTPP Custom dictionary/File rotation, etc.

configure

   context source

      gtpp
group default

      gtpp
dictionary custom10

      gtpp
storage-server mode local

      gtpp
storage-server local file format custom3

      gtpp
storage-server local file rotation cdr-count 1000

      gtpp
storage-server local file rotation time-interval 4000

      gtpp
storage-server local file rotation volume mb 8

end

Sample Configuration for SGSN when GSS is Used

S-CDRs are generated by Session Manager and are sent immediately to the GSS using a proprietary protocol based on UDP.

configure

   context source

      gtpp
group default

      gtpp
charging-agent address 192.168.201.1

      gtpp
storage-server 192.168.201.12 port 50000

      gtpp
dictionary custom10

end