> GGSN Service Configuration Procedures
> This chapter is meant to be used in conjunction with the previous chapter that describes the information needed to configure the system to support GGSN functionality for use in GPRS/UMTS networks.
> It is recommended that you identify the options from the previous chapters that are required for your specific deployment. You can then use the procedures in this chapter to configure those options.
> Procedures are provided for the following tasks:

> • | GGSN Service Configuration

> • | GTPP Accounting Support Configuration

> • | APN Configuration

> • | DHCP Service Configuration

> • | IP Address Pool Configuration on the System

> • | Gn-Gp Handoff Support Configuration

> • | FA Services Configuration

> • | Common Gateway Access Support Configuration

> Important: At least one Packet Accelerator Card (PAC) or Packet Services Card (PSC) must be made active prior to service configuration. Information and instructions for configuring PACs/PSCs to be active can be found in the Configuring System Settings chapter of the System Administration Guide.
> Caution: While configuring any base-service or enhanced feature, it is highly recommended to take care of conflicting or blocked IP addresses and port numbers for binding or assigning. In association with some service steering or access control features, like Access Control List configuration, use of inappropriate port number may result in communication loss. Refer respective feature configuration document carefully before assigning any port number or IP address for communication with internal or external network.
> GGSN Service Configuration
> GGSN services are configured within contexts and allow the system to function as a GGSN in the either a GPRS or UMTS wireless data network.
> Important: This section provides the minimum instruction set for configuring a GGSN service that allows the system to process PDP contexts. Commands that configure additional GGSN service properties are provided in the GGSN Service Configuration Mode Commands chapter of Command Line Interface Reference.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide.
> To configure the system to work as GGSN service:

> Step 1 | Create the GGSN service, local User Datagram Protocol (UDP) port for the Gn interfaces’ IP socket, and bind it to an IP address by applying the example configuration in the GGSN Service Creation and Binding section.

> Step 2 | Associate the accounting context for the GGSN service and configure charging characteristic profile parameters for GGSN service by applying the example configuration in the Accounting Context and Charging Characteristics Configuration section.

> Step 3 | Configure the SGSN and PLMN related policy and session setup timeout for the GGSN service by applying the example configuration in the SGSN and PLMN Policy Configuration section.

> Step 4 | Optional. Configure the GGSN service to support network-requested PDP contexts by applying the example configuration in the Network-requested PDP Context Support Configuration section.

> Step 5 | Verify your GGSN configuration by following the steps in the GGSN Configuration Verification section.

> Step 6 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> GGSN Service Creation and Binding
> Use the following example to create the GGSN service and bind it to an IP address:
> configure
> context <vpn_ctxt_name> -noconfirm
> ggsn-service <ggsn_svc_name>
> end
> Notes:

> • | A maximum of 256 services (regardless of type) can be configured per system.

> • | Bind address should not conflict with any other GTP-based service.

> Accounting Context and Charging Characteristics Configuration
> Use the following example to configure a GTPP accounting context and charging characteristics parameters for GGSN service.
> configure
> context <vpn_ctxt_name>
> ggsn-service <ggsn_svc_name>
> accounting context <aaa_ctxt_name>
> cc profile <cc_prof_index>
> end
> Notes:

> • | Charging characteristics behavior and profile index can be configured for multiple CC profile indexes. For more options and keywords like buckets, interval, , sgsns, tariff, volume etc., refer cc profile section in Command Line Interface Reference.

> • | This command works in conjunction with the cc-sgsn command located in the APN configuration mode that dictates which CCs should be used for subscriber PDP contexts. Refer to the APN Configuration section in this chapter.

> SGSN and PLMN Policy Configuration
> Use the following example to configure the SGSN and PLMN related policy and session setup timeout for the GGSN service:
> configure
> context <vpn_ctxt_name>
> ggsn-service <ggsn_svc_name>
> plmn id mcc <mcc_number> mnc <mnc_number> [primary]
> sgsn address <ip_address> / <subnet_mask>
> plmn unlisted-sgsn [foreign | home | reject]
> setup-timeout <dur_sec>
> end
> Notes:

> • | SGSN or PLMN related policy can be defined for multiple SGSNs or PLMN.

> • | For optional configuration parameters of SGSN address, refer Command Line Interface Reference.

> Important: The GGSN only communicates with the SGSNs configured using this command unless a PLMN policy is enabled to allow communication with unconfigured SGSNs. PLMN policies are configured using the plmn unlisted-sgsn command.
> Network-requested PDP Context Support Configuration
> Use the following example to configure the GGSN to support the network-requested PDP context:
> configure
> context <vpn_ctxt_name>
> network-requested-pdp-context activate <ip_address> dst-context <dst_ctxt_name> imsi <imsi> apn <apn_name>
> network-requested-pdp-context gsn-map <ip_address>
> end
> Notes:

> • | It is recommended that this functionality be configured in the system source context(s) along with the GGSN service(s).

> • | Up to 1000 IP address can be configured for network request PDP context support.

> • | Only one GSN-MAP node can be configured per system context.

> GGSN Configuration Verification

> Step 1 | Verify that your GGSN services were created and configured properly by entering the following command in Exec Mode:

> show ggsn-service name <ggsn_svc_name>}
> The output of this command given below is a concise listing of GGSN service parameter settings as shown in the sample output displayed. In this example, a GGSN service called ggsn1 was configured and you can observe some parameters configured as default.
> Service name: ggsn1
> Context: ggsn1
> Associated PGW svc: None
> Associated GTPU svc: None
> Accounting Context Name: ggsn1
> dns-client Context Name:
> Authorize: Disabled
> Fqdn-name: Disabled
> Bind: Done
> Local IP Address: 192.168.70.1 Local IP Port: 2123
> Self PLMN Id.: MCC: 450, MNC: 06
> Retransmission Timeout: 20 (secs)
> Max Retransmissions: 4
> Restart Counter: 16
> Echo Interval: 60 (secs)
> Guard Interval: 100 (secs)
> Setup Timeout: 60 (secs)
> PLMN Policy: Reject unlisted SGSN
> Reject Code Policy:
> Authentication Server Timeout: User Authentication Failed
> Accounting Server Timeout: No Resources Available
> Ran Procedure Ready: Disabled
> NSAPI in Create PDP response: Disabled
> Duplicate Subscriber Addr Request: Reject
> trace-collection-entity: Disabled
> Path Failure Detection on gtp msgs: Echo
> GTP Private Extensions:
> None
> Max IP sessions: 4000000
> Max PPP sessions: 2500000
> Max sessions: 4000000
> Service Status: Started
> Newcall Policy: None
> MBMS Policy: None
> MBMS Charging ID Optimization: Disabled
> 3GPP Qos to DSCP Mapping (for G-PDUs):
> qci 1: ef
> qci 2: ef
> qci 3: af11
> qci 4: af11
> qci 5: ef
> qci 6: ef
> qci 7: af21
> qci 8: af21
> qci 9: be
> 3GPP Qos to DSCP Mapping based on Alloc. Prio:
> qci 5 (Alloc. P 1): ef
> qci 5 (Alloc. P 2): ef
> qci 5 (Alloc. P 3): ef
> qci 6 (Alloc. P 1): ef
> qci 6 (Alloc. P 2): ef
> qci 6 (Alloc. P 3): ef
> qci 7 (Alloc. P 1): af21
> qci 7 (Alloc. P 2): af21
> qci 7 (Alloc. P 3): af21
> qci 8 (Alloc. P 1): af21
> qci 8 (Alloc. P 2): af21
> qci 8 (Alloc. P 3): af21
> GTPC messages: be
> Background: be
> Charging Characteristics(CC) Behaviors:
> No records (Bit No.): 0
> Charging Characteristics(CC) Profiles:
> Profile 0:
> Buckets: 4 SGSN changes: 4
> Profile 1:
> Buckets: 4 SGSN changes: 4
> SGSN Configuration List:
> sgsn address 2.2.2.2/32 mcc 111 mnc 999 description aaa-ggsn

> Step 2 | Verify configuration for errors by entering the following command in Exec Mode:

> show configuration errors section ggsn-service verbose
> GTPP Accounting Support Configuration
> This section provides instructions for configuring GTPP-based accounting for subscriber PDP contexts. GTPP-based accounting for a subscriber can be configured by CGF server configuration in a GTPP group. Additionally individual CGF server can be configured with this example.
> Important: To configure RADIUS and Diameter AAA functionality, refer AAA Interface Administration and Reference.
> 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. 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.
> GTPP version 2 is used by default. However, if version 2 is not supported by the CGF, the system reverts to using GTPP version 1. All subsequent CDRs are always fully-qualified partial CDRs. For CDR encoding different dictionaries are supported. For more information on GTPP dictionaries, refer AAA Interface Administration and Reference.
> Whether or not the GGSN accepts charging characteristics from the SGSN can be configured on a per-APN basis based on whether the subscriber is visiting, roaming or, home.
> By default, the GGSN always accepts the charging characteristics from the SGSN. However it accepts charging characteristics from RADIUS too, they must always be provided by the SGSN for GTPPv1 requests for primary and secondary PDP contexts.
> If the system is configured to reject the charging characteristics from the SGSN, the GGSN can be configured with its own that can be applied based on the subscriber type (visiting, roaming, or home) at the APN level (refer to the APN Configuration section of this chapter for more information). GGSN charging characteristics consist of a profile index and behavior settings (refer to the GGSN Service Configuration section of this chapter for more information). The profile indexes specify the criteria for closing accounting records based specific criteria (refer to the GGSN Service Configuration section of this chapter for more information).
> Important: This section provides the minimum instruction set for configuring a GTPP accounting support in a GGSN service. Commands that configure additional GTPP accounting properties are provided in the Command Line Interface Reference guide.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in GGSN Service Configuration section of this chapter.
> To configure the GTPP accounting support for a GGSN service:

> Step 1 | Create the GTPP group in accounting context by applying the example configuration in the GTPP Group Creation section.

> Step 2 | Configure the charging agent and GTPP server (CGF) related parameters for the GTPP accounting support by applying the example configuration in the GTPP Group Configuration section.

> Step 3 | Verify your GTPP group and accounting configuration by following the steps in the GTPP Group Configuration Verification section.

> Step 4 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> GTPP Group Creation
> Use the following example to create the GTPP group to support GTPP accounting:
> configure
> context <vpn_ctxt_name>
> gtpp group <gtpp_group_name> -noconfirm
> end
> Notes:

> • | In addition to one default GTPP group “default” a maximum of 8 GTPP groups can be configured with this command in a context.

> • | In case no GTPP group is configured in this context, system creates a default GTPP group named “default” and all the CGF servers and their parameters configured in this context are applicable to this “default” GTPP group.

> GTPP Group Configuration
> Use the following example to configure the GTPP server parameters, GTPP dictionary, and optionally CGF to support GTPP accounting:
> configure
> context <vpn_ctxt_name>
> gtpp group <gtpp_group_name>
> gtpp charging-agent address <ip_address> [port <port>]
> gtpp server <ip_address> [max <msgs >] [priority <priority>]
> gtpp dictionary <dictionaries>
> gtpp max-cdrs <number_cdrs> [wait-time <dur_sec>]
> gtpp transport-layer {tcp | udp}
> end
> Notes:

> • | In addition to one default GTPP group “default” a maximum of 8 GTPP groups can be configured with this command in a context.

> • | In case no GTPP group is configured in this context, system creates a default GTPP group named “default” and all the CGF servers and their parameters configured in this context are applicable to this “default” GTPP group.

> • | Command for CGF gtpp charging-agent is optional and configuring gtpp charging-agent on port 3386 may interfere with ggsn-service configured with the same ip address. Multiple interfaces can be configured within a single context if needed.

> • | For more information on GTPP dictionary encoding in addition to referring Command Line Interface Reference, refer AAA Interface Administration and Reference.

> • | For better performance, it is recommended to configure maximum number of CDRs as 255 with gtpp max-cdrs command.

> • | Operator can select transport layer protocol as TCP or UDP for Ga interface with gtpp transport-layer command.

> • | Multiple GTPP server can be configured using multiple instances of this command subject to following limits:

> • | Total 4 GTPP server in one GTPP group

> • | Total 32 GTPP server in one context or in the overall configuration

> • | Total 33 GTPP groups (1 default and 32 user defined GTPP groups) can be configured in one context. Number of CGFs in 1 GTPP group is limited to 4 and a total of 32 CGF servers across all GTPP groups in one context are configurable.

> • | Total 32 GTPP groups can also be configured under an APN

> GTPP Group Configuration Verification

> Step 1 | Verify that your CGFs were configured properly by entering the following command in Exec Mode:

> show gtpp accounting servers
> This command produces an output similar to that displayed below:
> context: source
> Preference IP Port Priority State Group
> ---------- --------------- ----- -------- ---------------- ----------
> Primary 192.168.32.135 3386 1 Active default
> Primary 192.168.89.9 3386 100 Active default

> Step 2 | Verify configuration for errors by entering the following command in Exec Mode:

> show configuration errors section ggsn-service verbose
> APN Configuration
> This section provides instructions for configuring the APN templates that are used to determine how PDP contexts should be processed. APNs are configured in system authentication contexts.
> Important: This section provides the minimum instruction set for configuring APNs in a GGSN service. Commands that configure additional APN properties are provided in APN Configuration Mode Commands chapter of Command Line Interface Reference.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in the GGSN Service Configuration section of this guide.
> To configure the APN properties for a GGSN service:

> Step 1 | Create the APN in system context and specify the support of PDP contexts and selection mode by applying the example configuration in the APN Creation and Configuration section.

> Step 2 | Configure the authentication and accounting parameters in APN by applying the example configuration in the Authentication, Accounting, and GTPP Group Configuration in APN section.

> Step 3 | Configure the IP allocation method in APN by applying the example configuration in the IP Address Allocation Method Configuration in APN section.

> Step 4 | Optional. Configure the charging characteristics related parameters for the APN by applying the example configuration in the Charging Characteristics Parameter Configuration in APN section.

> Step 5 | Optional. Configure virtual APNs by applying the example configuration in the Virtual APN Configuration section.

> Step 6 | Optional. Configure other optional parameters for the APN by applying the example configuration in the Other Optional Parameter Configuration in APN section.

> Step 7 | Verify your APN configuration by following the steps in the APN Configuration Verification section.

> Step 8 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> APN Creation and Configuration
> Use the following example to create and configure the APNs:
> configure
> context <vpn_ctxt_name>
> apn <apn_name> -noconfirm
> max-contexts primary <number> total <total_number>
> pdp-type {ipv4 [ipv6] | ipv6 [ipv4] | ppp}
> selection-mode {sent-by-ms | chosen-by-sgsn | subscribed}
> ip context-name <dst_ctxt_name>
> end
> Notes:

> • | Up to 1000 APNs can be configured on a system.

> • | APN templates should be created/configured within system authentication contexts or destination context.

> • | Selection mode parameter’s setting must be identical to the selection mode setting on the SGSN(s) that the GGSN communicates with. The GGSN rejects attempts to establish PDP contexts from any SGSN having a different setting.

> • | For IPv6 calls to work, the destination context must have an IPv6 interface configured in it.

> • | If the APN supports Mobile IP for subscriber PDP contexts, then ip context-name command is used to indicate the context in which the FA service is configured.

> • | If no context name is specified, the system uses the context in which the APN is configured.

> • | If Mobile IP is supported and no name is specified, the system uses the context in which the GGSN service facilitating the PDP context is located.

> Authentication, Accounting, and GTPP Group Configuration in APN
> This section describes the procedure to configure the authentication and accounting parameters for an APN. It also specify the procedure to attach a GTPP group with an APN.

> Step 1 | Configure the authentication and accounting parameters by applying the example configuration in the Authentication and Accounting Configuration in APN section.

> Step 2 | Attach a GTPP group with APN by applying the example configuration in the GTPP Group Association to APN section.

> Authentication and Accounting Configuration in APN
> Use the following example to configure the accounting mode and authentication parameter for APN:
> configure
> context <dst_ctxt_name>
> apn <apn_name>
> accounting-mode {none | gtpp | radius [no-interims] [no-early-pdus]}
> default authentication
> end
> Notes:

> • | APNs are configured in system authentication contexts or destination context.

> • | The authentication process varies depending on whether the PDP context is of type IP or PPP. The authentication command provides imsi-auth, msisdn-auth, eap initial-acess-request, allow-noauth, chap, mschap, and pap options. For more information on type of authentication, refer authentication section in APN Configuration Mode Commands chapter of Command Line Interface Reference.

> GTPP Group Association to APN
> After configuring GTPP group at context-level, an APN within the same context can be configured to use the user defined GTPP group.
> Refer section GTPP Accounting Support Configuration for GTPP group configuration.
> configure
> context <vpn_ctxt_name>
> apn <apn_name>
> gtpp group <gtpp_group_name> [accounting-context <aaa_ctxt_name>]
> end
> Notes:

> • | GTPP group must be configured before associating with APN or “default” GTPP group can be used.

> IP Address Allocation Method Configuration in APN
> Use the following example to configure the IP address allocation method for APN:
> Important: Additional charging characteristics parameters are configurable as part of the GGSN service. Refer to the GGSN Service Configuration section of this chapter for more information.
> configure
> context <dst_ctxt_name>
> apn <apn_name>
> ip address alloc-method { dhcp-proxy [allow-deferred] [prefer-dhcp-options] | dhcp-relay | local [allow-deferred] | no-dynamic [allow-deferred] } [allow-user-specified]
> end
> Notes:

> • | The process used by the system to determine how the address should be allocated. For detail information on IP address allocation, refer Usage section of ip address alloc-method command in APN Configuration Mode Commands chapter of Command Line Interface Reference.

> • | If DHCP-Proxy and DHCP-Relay method is selected for IP address allocation, a DHCP service must be configured on the system as described in DHCP Service Configuration section and specified the name of DHCP Service by entering the dhcp service-name command as described in APN Configuration Mode Commands chapter of Command Line Interface Reference.

> • | If local pool is selected for IP address allocation, a local pool must be configured on the system as described in IP Address Pool Configuration on the System section and specified the name of a private IP address pool by entering the ip address pool command as described in APN Configuration Mode Commands chapter of Command Line Interface Reference.

> Charging Characteristics Parameter Configuration in APN
> Use the following example to configure the charging characteristics parameter for APN:
> Important: Additional charging characteristics parameters are configurable as part of the GGSN service. Refer to the GGSN Service Configuration section of this chapter for more information.
> configure
> context <dst_ctxt_name>
> apn <apn_name>
> cc-sgsn {home-subscriber-use-GGSN | roaming-subscriber-use-GGSN | visiting-subscriber-use-GGSN}+
> cc-home behavior <bit> profile <index>
> cc-roaming behavior <bit> profile <index>
> cc-visiting behavior <bit> profile <index>
> end
> Notes:

> • | If multiple behavior bits are configured for a single profile index, the variable bits is achieved by “Or”ing the bit strings and converting the result to hexadecimal.

> Example
> If behavior bits 5 (0000 0001 0000) and 11 (0100 0000 0000) are both being assigned to profile index 5 for a home subscriber, the appropriate command is cc-home behavior 410 profile 5.
> Virtual APN Configuration
> Virtual APNs are references (or links) to alternative APNs to be used for PDP context processing based on properties of the context. Use the following example to configure the virtual APNs.
> configure
> context <dst_ctxt_name>
> apn <apn_name>
> virtual-apn preference <priority> apn <apn_name> { access-gw-address <IP_addr | IP_addr/mask> | bearer-access-service <bearer_access_svc_name> | cc-profile <cc_profile_index> | domain <domain_name> | mcc <mcc_number> mnc <mnc_number> | msisdn-range from <start_range> to <end_range> | rat-type { gan | geran | hspa | utran | wlan } | roaming-mode { home | visiting | roaming }
> end
> Notes:

> • | Up to 1023 references can be configured per APN. Additional information about “virtual” APNs and their operation can be found in the Command Line Interface Reference.

> Other Optional Parameter Configuration in APN
> Use the following example to configure various optional parameter for APN:
> configure
> context <dst_ctxt_name>
> apn <apn_name>
> dns {primary | secondary} {<dns_ip_address>}
> mobile-ip required
> mobile-ip home-agent <ha_ip_address>
> ip source-violation {ignore | check [drop-limit <limit>]} [exclude-from-accounting]
> restriction-value <value>
> timeout {absolute | idle | qos-renegotiate} <timeout_dur>
> timeout long-duration <ldt_dur> [inactivity-time <inact_dur>]
> long-duration-action detection
> long-duration-action disconnection [suppress-notification] [dormant-only] +
> end
> Notes:

> • | Mobile is supported for IP PDP contexts only. Mobile IP configuration attributes returned as part of a successful authentication during the GTP authentication phase (for non-transparent IP PDP contexts) supersede the APN configuration. Any attributes returned during the FA authentication phase are ignored.

> • | If mobile-ip required option is enabled, the system deletes any PDP context using the APN that can not establish a Mobile IP session.

> APN Configuration Verification

> Step 1 | Verify that your APN were configured properly by entering the following command in Exec Mode:

> show apn all
> This command produces an output similar to that displayed below is an excerpt from a sample output. In this example, an APN called apn1 was configured.
> access point name (APN): apn1
> authentication context: test
> pdp type: ipv4
> ehrpd access: N/A
> Selection Mode: subscribed
> ip source violation: Checked drop limit: 10
> accounting mode: gtpp No early PDUs: Disabled
> no-interims: Disabled
> Bearer Control Mode: none
> max-primary-pdp-contexts: 1000000 total-pdp-contexts: 1000000
> current primary-pdp-contexts: 0 total-pdp-contexts: 0
> primary contexts: not available total contexts: not available
> max secondary contexts per-subscriber: 10 IMS Authorization: disabled
> Credit Control: disabled
> mbms bearer absolute timeout: 0 mbms bearer idle timeout: 0
> mbms ue absolute timeout: 0
> permission:
> local ip: 0.0.0.0 nexthop gateway addr:
> primary dns: 0.0.0.0 secondary dns: 0.0.0.0
> primary nbns: 0.0.0.0 secondary nbns: 0.0.0.0
> ppp keep alive period : 0 ppp mtu : 1500
> absolute timeout : 0 idle timeout : 0
> idle-timeout-activity ignore-downlink: Disabled
> long duration timeout: 0 long dur inactivity time: Disabled
> long duration action: Detection
> wimax header compression/suppression: none
> ip header compression: vj
> ip hide service address: Disabled
> ip output access-group: ip input access-group:
> ipv6 output access-group: ipv6 input access-group:
> policy-group in: policy-group out:
> permit ip multicast: False
> ppp authentication:
> eap authentication initial-access-request: authenticate-authorize
> allow noauthentication: Enabled imsi authentication: Disabled
> msisdn authentication: Disabled
> ip destination context: ip-ctx
> Rule Base: default
> FW-and-NAT Policy: default
> Bandwidth-Policy: default
> Link-Monitoring: OFF
> Content-Filtering Policy-Id: Not configured
> mediation accounting: Disabled
> mediation-device context: Not set mediation no early PDUs: Disabled
> mediation no-interims: Disabled mediation delay-GTP-response: Disabled
> outbound username: N/A
> ip address pools: N/A
> ip address secondary pools: N/A
> access-link ip-frag: df-ignore
> ignore DF-bit data-tunnel: On
> ip allocation type: local pool allow user specified ip addr: true
> prefer dhcp options: false
> allow deferred: true
> 3GPP Qos to DSCP Mapping:
> qci 1: ef
> qci 2: ef
> qci 3: af11
> qci 4: af11
> qci 5: ef
> qci 6: ef
> qci 7: af21
> qci 8: af21
> qci 9: be
> 3GPP Qos to DSCP Mapping based on Alloc. Prio:
> qci 5 (Alloc. P 1): ef
> qci 5 (Alloc. P 2): ef
> qci 5 (Alloc. P 3): ef
> qci 6 (Alloc. P 1): ef
> qci 6 (Alloc. P 2): ef
> qci 6 (Alloc. P 3): ef
> qci 7 (Alloc. P 1): af21
> qci 7 (Alloc. P 2): af21
> qci 7 (Alloc. P 3): af21
> qci 8 (Alloc. P 1): af21
> qci 8 (Alloc. P 2): af21
> qci 8 (Alloc. P 3): af21
> GTPP Group: gtpp-gp GTPP Accounting Context: acc
> Mobile IPv6 Tunnel MTU: 1500
> Mobile IPv6 Tunnel MTU Exceed Action: notify-sender
> Mobile IPv6 Home Agent: none
> Mobile IPv6 Home Link Prefix: ::/0
> Mobile IPv6 Home Address: none

> Step 2 | Verify configuration for errors in APN configuration by entering the following command in Exec Mode:

> show configuration errors section ggsn-service verbose
> DHCP Service Configuration
> The system can be configured to use the Dynamic Host Control Protocol (DHCP) to assign IP addresses for PDP contexts. IP address assignment using DHCP is done using one of two methods as configured within an APN:

> • | DHCP-proxy: The system acts as a proxy for client (MS) and initiates the DHCP Discovery Request on behalf of client (MS). Once it receives an allocated IP address from DHCP server in response to DHCP Discovery Request, it assigns the received IP address to the MS. This allocated address must be matched with the an address configured in an IP address pool on the system. This complete procedure is not visible to MS.

> As the number of addresses in memory decreases, the system solicits additional addresses from the DHCP server. If the number of addresses stored in memory rises above the configured limit, they are released back to the DHCP server.

> • | DHCP-relay: The system acts as a relay for client (MS) and forwards the DHCP Discovery Request received from client (MS). Once it receives an allocated IP address from DHCP server in response to DHCP Discovery Request, it assigns the received IP address to the MS.

> Regardless of the DHCP method, there are parameters that must first be configured that specify the DHCP servers to communicate with and how the IP address are handled. These parameters are configured as part of a DHCP service.
> Important: This section provides the minimum instruction set for configuring a DHCP service on system for DHCP-based IP allocation. For more information on commands that configure additional DHCP server parameters and working of these commands, refer DHCP Service Configuration Mode Commands chapter of Command Line Interface Reference.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in GGSN Service Configuration section of this chapter.
> To configure the DHCP service:

> Step 1 | Create the DHCP service in system context and bind it by applying the example configuration in the DHCP Service Creation section.

> Step 2 | Configure the DHCP servers and minimum and maximum allowable lease times that are accepted in responses from DHCP servers by applying the example configuration in the DHCP Server Parameter Configuration section.

> Step 3 | Verify your DHCP Service configuration by following the steps in the DHCP Service Configuration Verification section.

> Step 4 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> DHCP Service Creation
> Use the following example to create the DHCP service to support DHCP-based address assignment:
> configure
> context <dest_ctxt_name>
> dhcp-service <dhcp_svc_name>
> bind address <ip_address> [nexthop-forwarding-address <nexthop_ip_address> [mpls-label input <in_mpls_label_value> output <out_mpls_label_value1> [out_mpls_label_value2]]]
> end
> Notes:

> • | To ensure proper operation, DHCP functionality should be configured within a destination context.

> • | Optional keyword nexthop-forwarding-address <nexthop_ip_address> [mpls-label input <in_mpls_label_value> output <out_mpls_label_value1> [ out_mpls_label_value2 ]] applies DHCP over MPLS traffic.

> DHCP Server Parameter Configuration
> Use the following example to configure the DHCP server parameters to support DHCP-based address assignment:
> configure
> context <dest_ctxt_name>
> dhcp-service <dhcp_svc_name>
> dhcp server <ip_address> [priority <priority>
> dhcp server selection-algorithm {first-server | round-robin}
> lease-duration min <minimum_dur> max <max_dur>
> dhcp deadtime <max_time>
> dhcp detect-dead-server consecutive-failures <max_number>
> max-retransmissions <max_number>
> retransmission-timeout <dur_sec>
> end
> Notes:

> • | Multiple DHCP can be configured by entering dhcp server command multiple times. A maximum of 20 DHCP servers can be configured.

> • | The dhcp detect-dead-server command and max-retransmissions command work in conjunction with each other.

> • | The retransmission-timeout command works in conjunction with max-retransmissions command.

> DHCP Service Configuration Verification

> Step 1 | Verify that your DHCP servers configured properly by entering the following command in Exec Mode:

> show dhcp service all
> This command produces an output similar to that displayed below where DHCP name is dhcp1:
> Service name: dhcp1
> Context: isp
> Bind: Done
> Local IP Address: 150.150.150.150
> Service Status: Started
> Retransmission Timeout: 3000 (milli-secs)
> Max Retransmissions: 2
> Lease Time: 600 (secs)
> Minimum Lease Duration: 600 (secs)
> Maximum Lease Duration: 86400 (secs)
> DHCP Dead Time: 120 (secs)
> DHCP Dead consecutive Failure:5
> DHCP T1 Threshold Timer: 50
> DHCP T2 Threshold Timer: 88
> DHCP Client Identifier: Not Used
> DHCP Algorithm: Round Robin
> DHCP Servers configured:
> Address: 150.150.150.150 Priority: 1
> Next Hop Address: 192.179.91.3
> MPLS-label:
> Input: 5000
> Output: 1566 1899

> Step 2 | Verify the DHCP service status by entering the following command in Exec Mode:

> show dhcp service status
> IP Address Pool Configuration on the System
> Before an MS is able to access data services, they must have an IP address. As described previously, the GGSN supports static or dynamic addressing (through locally configured address pools on the system, DHCP client-mode, or DHCP relay-mode). Regardless of the allocation method, a corresponding address pool must be configured.
> IP addresses can be dynamically assigned from a single pool/a group of IP pools/a group of IP pool groups. The addresses/IP pools/ IP pool groups are placed into a queue in each pool or pool group. An address is assigned from the head of the queue and, when released, returned to the end. This method is known as least recently used (LRU).
> On initiation of a session, a request of IP address from IP pool is sent and system assigns an IP address out of "available" IP address(es) in the pool. This assigned IP address is set to “allocated” state and cannot be used for any other session during this state. As soon as the session is cleared the state of “allocated” IP address is changed to “released” and is ready for allocation to any other subscriber session. If a “hold” timer is set for assigned/released IP address(es), it will go into the “hold” state and remain there till the timer expires. As soon as “hold timer” expires its state is changed from “hold” to “released” state and it will be available for reallocation. The “available” IPs include “free” and “released” IP addresses.
> Free IPs are used first depending on which subscriber is connecting. Normally same IP is given to a subscriber. So if a subscriber is connecting again, instead of using a free IP, GGSN allocates the IP which was given to him previously. This IP will be from the released state. For GGSN, Username and IMSI are used as key for generating subscriber ID used by VPN while allocating IP from the IP pool. Therefore if the subscriber ID matches to any of the previous ones for IPs in released state, that IP is re-allocated to that subscriber, otherwise a new IP is allocated.
> When a group of pools have the same priority, an algorithm is used to determine a probability for each pool based on the number of available addresses, then a pool is chosen based on the probability. This method, over time, allocates addresses evenly from the group of pools.
> Important: Setting different priorities on each individual pool can cause addresses in some pools to be used more frequently.
> Important: This section provides the minimum instruction set for configuring local IP address pools on the system. For more information on commands that configure additional parameters and options, refer ip pool command section in Context Configuration Mode Commands chapter of Command Line Interface Reference.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in GGSN Service Configuration section of this chapter.
> To configure the IP pool:

> Step 1 | Create the IP pool for IPv4 addresses in system context by applying the example configuration in the IPv4 Pool Creation section.

> Step 2 | Optional. Configure the IP pool for IPv6 addresses in system context by applying the example configuration in the IPv6 Pool Creation section.

> Step 3 | Verify your IP pool configuration by following the steps in the IP Pool Configuration Verification section.

> Step 4 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> IPv4 Pool Creation
> Use the following example to create the IPv4 address pool:
> configure
> context <dest_ctxt_name>
> ip pool <pool_name> <ip_address/mask> [{private| public}[priority]] | static]
> end
> Notes:

> • | To ensure proper operation, IP pools should be configured within a destination context.

> • | Each address in the pool requires approximately 24 bytes of memory. Therefore, in order to conserve available memory, the number of pools may need to be limited depending on the number of addresses to be configured and the number of PACs/PSCs installed.

> • | Setting different priorities on individual pools can cause addresses in some pools to be used more frequently.

> • | For more information on commands/keywords that configure additional parameters and options, refer ipv6 pool command section in Context Configuration Mode Commands chapter of Command Line Interface Reference.

> IPv6 Pool Creation
> Use the following example to create the IPv6 address pool:
> configure
> context <dest_ctxt_name>
> ipv6 pool <pool_name> 6to4 local-endpoint <ip_address>[private][public][shared][static]
> end
> Notes:

> • | To ensure proper operation, IP pools should be configured within a destination context.

> • | Each address in the pool requires approximately 24 bytes of memory. Therefore, in order to conserve available memory, the number of pools may need to be limited depending on the number of addresses to be configured and the number of PACs/PSCs installed.

> • | Setting different priorities on individual pools can cause addresses in some pools to be used more frequently.

> • | For more information on commands/keywords that configure additional parameters and options, refer ipv6 pool command section in Context Configuration Mode Commands chapter of Command Line Interface Reference.

> IP Pool Configuration Verification

> Step 1 | Verify that your IPv4 address pool configured properly by entering the following command in Exec Mode:

> show ip pool
> The output from this command should look similar to the sample shown below. In this example all IP pools were configured in the isp1 context.
> context : isp1:
> +-----Type: (P) - Public (R) - Private
> | (S) - Static (E) - Resource
> |
> |+----State: (G) - Good (D) - Pending Delete (R)-Resizing
> ||
> ||++--Priority: 0..10 (Highest (0) .. Lowest (10))
> ||||
> ||||+-Busyout: (B) - Busyout configured
> |||||
> |||||
> vvvvv Pool Name Start Address Mask/End Address Used Avail
> ----- ---------- --------------- ------------------ -------- --------
> PG00 ipsec 12.12.12.0 255.255.255.0 0 254
> RG00 pool3 30.30.0.0 255.255.0.0 0 65534
> SG00 pool2 20.20.0.0 255.255.0.0 10 65524
> PG00 pool1 10.10.0.0 255.255.0.0 0 65534
> SG00 vpnpool 192.168.1.250 192.168.1.254 0 5
> Total Pool Count: 5

> Step 2 | Verify that your IPv6 address pools configured properly by entering the following command in Exec Mode:

> show ipv6 pools
> The output from this command should look similar to the sample shown above except IPv6 addresses.
> Gn-Gp Handoff Support Configuration
> This section describes all about the configurations that are required to enable the handoff between the 3GPP 2G/3G SGSN and P-GW over Gn-Gp interfaces.
> Important: This feature is a license-enabled support and you may need to install a feature specific session license on your system to use some commands related to this configuration.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide, GGSN service as described in GGSN Service Configuration section in this chapter.
> To configure the Gn-Gp handoff on GGSN node:

> Step 1 | Create and configure the GTP-U service by applying the example configuration in the GTP-U Service Configuration section.

> Step 2 | Modify GGSN service to facilitate the handoff between SGSN/GGSN and P-GW by applying the example configuration in the Modifying GGSN Configuration for Gn-Gp Handoff section.

> Step 3 | Modify APN configuration to the “subscribed” selection mode by applying the example configuration in APN Configuration for Gn-Gp Handoff section.

> Step 4 | Verify your handoff configuration by following the steps in the Gn-Gp Configuration Verification section.

> Step 5 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> GTP-U Service Configuration
> Use the following example to configure the GTP-U service:
> configure
> context <ctxt_name> -noconfirm
> gtpu-service <gtpu_svc_name>
> bind ipv4-address <ip_address>
> echo-interval <time_interval>
> end
> Notes:

> • | <ctxt_name> is name of the context which contains GTPU service on system.

> • | <time_interval> is the time interval in seconds at which GPRS Tunneling Protocol (GTP) v1-U Echo packets are sent.

> • | <ip_address> is the IP address of IPv4 or IPv6 type to which the GTP-U service will be binded.

> Modifying GGSN Configuration for Gn-Gp Handoff
> Use the following example to create/modify the GGSN config for this feature.
> configure
> context <ctxt_name>
> ggsn-service <ggsn_svc_name>
> associate gtpu-service <gtpu_svc_name>
> associate pgw-service <pgw_svc_name>
> bind address <ip_address>
> end
> Notes:

> • | <ggsn_svc_name> is name of the existing GGSN service.

> • | <gtpu_svc_name> is name of the existing GTP-U service created in GTP-U Service Configuration example.

> • | <pgw_svc_name> is the existing P-GW service name.

> • | <ip_address> is the same IP address to which GTP-U service is binded in GTP-U Service Configuration example.

> • | <ctxt_name> is the name of the context which contains the GGSN service.

> APN Configuration for Gn-Gp Handoff
> Use the following example to modify the APN configuration for the smooth handover support between SGSN/GGSN and P-GW:
> configure
> context <ctxt_name>
> apn <apn_name>
> selection-mode subscribed
> ip context-name <ctxt_name>
> pdp-type <ipv4 | ipv6>
> end
> Notes:

> • | Make sure that the APN Selection mode parameters setting is set to “subscribed”, which is also the default mode.

> Gn-Gp Configuration Verification

> • | Verify that all the configurations made in a specific context under Context Configuration mode are in place and the P-GW service and GTP-U services have been associated to the GGSN service by entering the following command in Exec mode:

> show ggsn-service name ggsn
> The output from this command should look similar to the sample shown below. In this example context name A was created in Exec mode, GGSN service ggsn was created in GGSN Service Configuration mode, PGW service named pgw was an already configured service and GTP-U service named gtpu was configured in the GTPU Service Configuration mode:
> Service name: ggsn
> context: A
> Associated PGW svc: pgw
> Associated GTPU svc: gtpu
> .
> .
> Bind: Done
> Local IP Address: 120.56.45.12 Local IP Port: 2123
> ...
> ...
> Echo Interval: 60 (secs)
> .
> .
> .
> FA Services Configuration
> FA services are configured within contexts and allow the system to function as an FA in the 3G wireless data network.
> Important: This section provides the minimum instruction set for configuring an FA service that allows the system to process data sessions. Commands that configure additional FA service properties are provided in the Command Line Interface Reference. Additionally, when configuring Mobile IP take into account the MIP timing considerations discussed in Mobile-IP and Proxy-MIP Timer Considerations.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in GGSN Service Configuration section of this chapter.
> To configure the FA service:

> Step 1 | Create the FA service in the system context created to facilitate FA service by applying the example configuration in the FA Service Creation section.

> Step 2 | Bind the configured FA service to a local IP address interface with UDP port and specify the maximum number of subscribers that can access this service for the Pi interfaces’ IP socket by applying the example configuration in the IP Interface and UDP Port Binding for Pi Interface section.

> Step 3 | Configure the security parameter index (SPI) between FA service and HA by applying the example configuration in the Security Parameter Index (SPI) Configuration section.

> Step 4 | Specify the FA agent advertisement related parameters like lifetime, number of advertisements, and registration lifetime by applying the example configuration in the FA Agent Advertisement Parameter Configuration section.

> Step 5 | Configure the number of registration per subscriber, authentication procedure, and registration timeout parameters for this FA service by applying the example configuration in the Subscriber Registration, Authentication and Timeout Parameter Configuration section.

> Step 6 | Optional. Configure the FA service for controlling the negotiation and sending of the I-bit in revocation messages by applying the example configuration in the Revocation Message Configuration section.

> Step 7 | Verify your FA service configuration by following the steps in the FA Service Configuration Verification section.

> Step 8 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> FA Service Creation
> Use the following example to create the FA service:
> Important: A maximum of 256 services (regardless of type) can be configured per system.
> configure
> context <fa_ctxt_name> -noconfirm
> fa-service <fa_svc_name> -noconfirm]
> end
> Notes:

> • | <fa_ctxt_name> is name of the context to use for FA service configuraiton. Generally FA should be configured within a destination context.

> • | <fa_svc_name> is name of the FA service where other parameters have to configure for FA functionality.

> IP Interface and UDP Port Binding for Pi Interface
> Use the following example to bind the FA service to an local IP interface and specify the maximum number of subscribers that can access this service. Binding an interface to the FA service causes the interface to take on the characteristics of a Pi interface.
> configure
> context <fa_ctxt_name>
> fa-service <fa_svc_name>
> bind address <fa_ip_address> max-subscribers <max_subs>
> ip local-port <udp_port_num>
> end
> Notes:

> • | <fa_svc_name> is name of the FA service which is created to configure FA functionality.

> • | <fa_ip_address> is the local IP address in IPv4/IPv6 notation for providing Pi interface characteristics.

> • | <max_subs> is the maximum number of subscribers that can access this service on this interface. This can be configured to any integer value from 0 to 500,000. The default is 500,000.

> Important: The maximum number of subscribers supported is dependant on the session capacity license installed and the number of active PACs/PSCs installed in the system. For more information on session capacity license, refer to the Software Management Operations chapter of the System Administration Guide.

> • | <udp_port_num> is the UDP port number from 1 through 65535 to be used for Pi interface. Default port number is 434.

> • | For more information on commands/keywords that configure additional parameters and options, refer FA Service Configuration Mode Commands chapter of Command Line Interface Reference.

> Security Parameter Index (SPI) Configuration
> Use the following example to configure the security parameter index (SPI) between FA service and HA:
> Important: A maximum of 2048 FA-HA SPIs can be configured for a single FA service.
> configure
> context <fa_ctxt_name>
> fa-service <fa_svc_name>
> fa-ha-spi remote-address <ha_ip_address> spi-number <spi_num> {encrypted secret <enc_secret_key> | secret <secret_key>} [description <desc_string>]
> end
> Notes:

> • | <fa_svc_name> is name of the FA service which is created to configure FA functionality.

> • | <ha_ip_address> is the IP address in IPv4/IPv6 notation of HA to which this FA service will interact.

> • | <spi_num> specifies the SPI number which indicates a security context between the FA and the HA in accordance with RFC 2002 and can be configured to any integer value from 256 through 4294967295.

> • | <enc_secret_key> specifies the encrypted shared key between the FA and the HA services. It must be from 1 to 127 alpha and/or numeric characters and is case sensitive.

> Important: The encrypted keyword is intended only for use by the system while saving configuration scripts. The system displays the encrypted keyword in the configuration file as a flag that the variable following the secret keyword is the encrypted version of the plain text secret. Only the encrypted secret is saved as part of the configuration file.

> • | <secret_key> specifies the secret shared key between the FA and the HA services. It must be from 1 to 127 alpha and/or numeric characters and is case sensitive.

> • | <desc_string> is the description for this SPI and must be from 1 to 31 alpha and/or numeric characters.

> • | For more information on commands/keywords that configure additional parameters and options, refer FA Service Configuration Mode Commands chapter of Command Line Interface Reference.

> FA Agent Advertisement Parameter Configuration
> Use the following example to configure the agent advertisement parameters for this FA service:
> configure
> context <fa_ctxt_name>
> fa-service <fa_svc_name>
> advertise adv-lifetime <advt_dur>
> advertise num-adv-sent <advt_num>
> advertise reg-lifetime <reg_dur>
> end
> Notes:

> • | <fa_svc_name> is name of the FA service which is created to configure FA functionality.

> • | <advt_dur> is the amount of time that an FA agent advertisement remains valid in the absence of further advertisements. It is measured in seconds and can be configured to any integer value from 1 to 65535. The default is 9000.

> • | <advt_num> is the number of unanswered agent advertisements that the FA service allows during call setup before it rejects the session. It can be any integer value from 1 to 65535. The default is 3.

> • | <reg_dur> specify the longest registration lifetime that the FA service allows in any Registration Request message from the mobile node. It is measured in seconds and can be configured to any integer value from 1 to 65534. The default is 600.

> Subscriber Registration, Authentication and Timeout Parameter Configuration
> Use the following example to configure the number of subscriber registration, authentication procedure and registration timeout parameters for this FA service:
> configure
> context <fa_ctxt_name>
> fa-service <fa_svc_name>
> multiple-reg <reg_num>
> reg-timeout <timeout_dur>
> authentication mn-aaa {always | ignore-after-handoff | init-reg | init-reg-except-handoff | renew-and-dereg-noauth | renew-reg-noauth} [optimize-retries]
> end
> Notes:

> • | <fa_svc_name> is name of the FA service which is created to configure FA functionality.

> • | <reg_num> is the number of simultaneous Mobile IP sessions that are to be supported for a single subscriber. It can be configured to any integer value from 1 to 3. The default value is 1.

> Important: The system supports multiple Mobile IP sessions per subscriber only if the subscriber’s mobile node has a static IP address. The system only allows a single Mobile IP session for mobile nodes that receive a dynamically assigned home IP address.
> Important: In addition, because only a single Mobile IP or proxy-Mobile IP session is supported for IP PDP contexts, this parameter must remain at its default configuration.

> • | <timeout_dur> is the maximum amount of time that the FA service waits for a Registration Rely message from the HA. It is measured in seconds and can be configured to any integer value from 1 to 65535. The default value is 45.

> • | For more information on authentication mn-aaa commands/keywords that configure additional parameters and options, refer FA Service Configuration Mode Commands chapter of Command Line Interface Reference.

> Revocation Message Configuration
> Use the following example to configure the FA service for controlling the negotiation and sending of the I-bit in revocation messages:
> configure
> context <fa_ctxt_name>
> fa-service <fa_svc_name>
> revocation negotiate-i-bit
> end
> Notes:

> • | By default the system will not send the I-bit in the revocation message.

> FA Service Configuration Verification

> Step 1 | Verify that your FA service is configured properly by entering the following command in Exec Mode:

> show fa-service all
> The output from this command should look similar to the sample shown below. In this example an FA service named fa1 was configured in the isp1 context.
> Service name: fa1
> Context: isp1
> Bind: Done Max Subscribers: 500000
> Local IP Address: 195.20.20.3 Local IP Port 434
> Lifetime: 00h10m00s Registration Timeout: 45 (secs)
> Advt Lifetime 02h30m00s Advt Interval: 5000 (msecs)
> Num Advt: 5
> Advt Prefix Length Extn: NO
> Reverse Tunnel: Enabled GRE Encapsulation: Enabled
> SPI(s):
> FAHA: Remote Addr: 195.30.30.3/32
> Hash Algorithm: HMAC_MD5 SPI Num: 1000
> Replay Protection: Timestamp Timestamp Tolerance: 60
> IPSEC Crypto Map(s):
> Peer HA Addr: 195.30.30.2
> Crypto Map: test
> Registration Revocation: Enabled Reg-Revocation I bit: Enabled
> Reg-Revocation Max Retries: 3 Reg-Revocation Timeout: 3 (secs)
> Reg-Rev on InternalFailure: Enabled

> Step 2 | Verify configuration for errors in FA service by entering the following command in Exec Mode:

> show configuration errors section fa-service verbose
> Common Gateway Access Support Configuration
> This section describes some advance feature configuration to support multiple access networks (CDMA, eHRPD and LTE) plus a GSM/UMTS for international roaming with the same IP addressing behavior and access to 3GPP AAA for subscriber authorization. Subscribers using static IP addressing will be able to get the same IP address regardless of the access technology.
> This configuration combines 3G and 4G access technologies in a common gateway supporting logical services of HA, PGW, and GGSN to allow subscribers to have the same user experience, independent of the access technology available.
> Important: This feature is a license-enabled support and you may need to install a feature specific session license on your system to use some commands related to this configuration.
> These instructions assume that you have already configured the system level configuration as described in System Administration Guide and GGSN service as described in GGSN Service Configuration section in this chapter.
> To configure the S6b and other advance features:

> Step 1 | Configure Diameter endpoint by applying the example configuration in the Diameter Endpoint Configuration section.

> Step 2 | Create or modify AAA group by applying the example configuration in the AAA Group Configuration section.

> Step 3 | Modify GGSN service to allow authorization with HSS by applying the example configuration in the Authorization over S6b Configuration section.

> Step 4 | Optional. Create and associate DNS client parameters by applying the example configuration in the DNS Client Configuration section.

> Step 5 | Optional. Modify GGSN service to accept duplicate calls when received with same IP address by applying the example configuration in the Duplicate Call Accept Configuration section.

> Step 6 | Verify your S6b configuration by following the steps in the Common Gateway Access Support Configuration Verification section.

> Step 7 | Save your configuration as described in the Verifying and Saving Your Configuration chapter.

> Diameter Endpoint Configuration
> Use the following example to configure the Diameter endpoint:
> configure
> context <ggsn_ctxt_name> -noconfirm
> diameter endpoint <s6b_endpoint_name>
> origin host <host_name> address <ip_address>
> peer <peer_name> realm <realm_name> address <ip_address> port <port_num>
> end
> Notes:

> • | <ggsn_ctxt_name> is name of the context which contains GGSN service on system.

> AAA Group Configuration
> Use the following example create/modify the AAA group for this feature.
> configure
> context <fa_ctxt_name>
> aaa group <aaa_grp_name>
> diameter authentication dictionary aaa-custom15
> diameter authentication endpoint <s6b_endpoint_name>
> diameter authentication server <server_name> priority <priority>
> end
> Notes:

> • | <s6b_endpoint_name> is name of the existing Diamtere endpoint.

> Authorization over S6b Configuration
> Use the following example to enable the S6b interface on GGSN service with 3GPP AAA/HSS:
> configure
> context <ggsn_ctxt_name>
> ggsn-service <ggsn_svc_name>
> plmn-unlisted-sgsn home
> authorize-with-hss
> fqdn host <host_name> realm <realm_name>
> end
> Notes:

> • | <ggsn_svc_name> is name of the GGSN service which is already created on the system.

> DNS Client Configuration
> Use the following example to enable the S6b interface on GGSN service with 3GPP AAA/HSS:
> configure
> context <ggsn_ctxt_name>
> ip domain-lookup
> ip name-servers <ip_address/mask>
> dns-client <dns_name>
> bind address <ip_address>
> resolver retransmission-interval <duration>
> resolver number-of-retries <retrie>
> cache ttl positive <ttl_value>
> exit
> ggsn-service <ggsn_svc_name>
> default dns-client context
> end
> Notes:

> • | <ggsn_svc_name> is name of the GGSN service which is already created on the system.

> Duplicate Call Accept Configuration
> Use the following example to configure GGSN service to accept the duplicate session calls with request for same IP address:
> configure
> context <ggsn_ctxt_name>
> ggsn-service <ggsn_svc_name>
> newcall duplicate-subscriber-requested-address accept
> end
> Notes:

> • | <ggsn_svc_name> is name of the GGSN service which is already created on the system.

> Common Gateway Access Support Configuration Verification

> Step 1 | Verify that your common gateway access support is configured properly by entering the following command in Exec Mode:

> show ggsn-service all
> The output from this command should look similar to the sample shown below. In this example GGSN service named GGSN1 was configured in the vpn1 context.
> Service name: ggsn1
> Context: cn1
> Associated PGW svc: None
> Associated GTPU svc: None
> Accounting Context Name:cn1
> dns-client Context Name:cn1
> Authorize: hss
> Fqdn-name: xyz.abc@starent.networks.com
> Bind: Not Done
> Local IP Address: 0.0.0.0 Local IP Port: 2123
> Self PLMN: Not defined
> Retransmission Timeout: 5 (secs)

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