CISCO-GTP-DIRECTOR-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2001-09-13

Category: Cisco Devices, Mobile IP, Telephony and VoIP

Description: Provides management objects for the Cisco GTP Director, which load-balances GTP signaling across multiple GGSN nodes in mobile core networks.

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What Is CISCO-GTP-DIRECTOR-MIB?

CISCO-GTP-DIRECTOR-MIB manages the Cisco GTP Director module, a function that load-balances GPRS Tunneling Protocol (GTP) signaling requests, such as Create PDP Context requests, across multiple GGSN nodes in a mobile packet-core network based on Access Point Name (APN). It exposes configuration data (timers for saving pending PDP request state) alongside operational counters covering forwarded, rejected, dropped, and unsupported GTP messages, plus notification controls. These statistics are used to monitor the software-level health and load of the director function itself, since a spike in cgdCreateRequestRejected, cgdPdpRequestDropped, or cgdTotalUnsupportedMessages signals overload, misconfiguration, or a downstream GGSN outage rather than a hardware fault. The MIB is a Cisco proprietary extension with no direct dependency on a specific IETF GTP MIB, built to complement Cisco's broader GPRS/GGSN MIB family. It is deployed on Cisco routers or GGSN front-end platforms acting as GTP signaling load balancers in mobile operator core networks. Engineers can download the CISCO-GTP-DIRECTOR-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-GTP-DIRECTOR-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco GTP Director mobile packet-core platforms

Monitoring Examples

A NOC would poll cgdPendingPdps and cgdTotalCreatePdpRequestFwded to see current in-flight PDP context setup load and confirm requests are being forwarded to GGSNs normally. A sudden increase in cgdCreateRequestRejected or cgdPdpRequestDropped, especially alongside a flat cgdCreatePdpRequestFwded, would point to a GGSN pool becoming unreachable or overloaded. cgdNotifEnable and cgdNotifType can be checked to confirm SNMP traps are configured to alert operators automatically when these thresholds are hit.

What Can Be Monitored

pending PDP context requests
PDP requests forwarded
PDP create requests rejected
dropped PDP requests
unsupported GTP messages
notification/trap configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using cgdCreatePdpRequestFwded OID:

Select a Cisco mobile packet-core platform as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cgdCreatePdpRequestFwded into the Find box to locate it in the OID tree, then select it and click OK. This object gives the number of unique create PDP requests forwarded by the GDM to GGSN. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoGtpDirectorMIB	1.3.6.1.4.1.9.9.245			This MIB module defines objects that are used to manage GTP Director Module. In the GPRS network, the APN is the identifier that specifies where the user is connecting. The APN identifies whether the network is a corporate network or a service provider network. The APN comprises of two parts, the network id and the operator id. The Single Access point feature enables the service provider to add new access-points to the GGSN without having to provision the HLR. The requests are sent by the SGSN to the same virtual APN. A virtual APN is not associated with any actual physical network. The GGSN processes the request and forwards the packet to the appropriate access-point that is specified in the PCO. The Single APN feature is supported only in Cisco GGSNs. The purpose of the GTP-Director is to provide a mechanism for service providers using non-Cisco GGSN to use the Single APN feature. This would enable the service providers to add access-point to the network without having to provision the HLR. This will be transparent to the SGSN. The mobile user initiates a connection request to the SGSN. The access-point name specified in the request is the virtual APN. The GTP-Director would resolve the access-point name and forward the request to the appropriate GGSN (real GGSN). +==+ +===+ +====+ ==== +===+ +====+ +===+ \|MS\|--\|BSS\|--\|SGSN\|--\|PLMN\|--\|GDM\|--\|GGSN\|--Gi-\|PDN\| +==+ +===+ +====+ ==== +===+ +====+ +===+ \| \| \| \| +====+ \| \|___\|GGSN\|------Gi \| +====+ \| \| \| \| +====+ +===+ \|_____\|GGSN\|--Gi-\|PDN\| +====+ +===+ The GTP-Director also provides load balancing across GGSNs. The GTP-Director uses the round-robin mechanism for providing load balancing. The Cisco GGSNs may use the GTP-Director, but is not necessary as they can use IOS-SLB ( Server Load Balancing ). Acronyms and terms: APN Access Point Name BSS Base Staion Subsystem GDM GTP Director Module GGSN Gateway GPRS Support Node Gi Reference point between GPRS and an external packet data network GPRS General Packet Radio Service HLR Home Location Register NMS Network Management System PCO Protocol Configuration Options PDN Packet Data Network PDP Packet Data Protocol PLMN Public Land Mobile Network MS Mobile Station SGSN Serving GPRS Support Node TID Tunnel Identifier
ciscoGtpDirectorMIBObjects	1.3.6.1.4.1.9.9.245.1
cgdConfigurations	1.3.6.1.4.1.9.9.245.1.1
U32 cgdCreatePdpRequestInfoSaveTimer	1.3.6.1.4.1.9.9.245.1.1.1	Unsigned32	read-write	When a GDM receives a request to create PDP, it processes and forwards the request to the GGSN and saves the information related to the request. This object defines the time during which the information is maintained by the GDM. Any subsequent retries by the SGSN within this time period will be forwarded to the same GGSN, but the timer will not be reset if a retry occurs before it has expired.
cgdStatus	1.3.6.1.4.1.9.9.245.1.2
G32 cgdPendingPdps	1.3.6.1.4.1.9.9.245.1.2.1	Gauge32	read-only	This object gives the number of create PDP requests whose connection retry timer has not expired.
cgdStatistics	1.3.6.1.4.1.9.9.245.1.3
C32 cgdCreatePdpRequestFwdedEx	1.3.6.1.4.1.9.9.245.1.3.1	Counter32	read-only	This object gives the number of unique create PDP requests forwarded by the GDM to GGSN. This does not include the retransmissions.
C32 cgdTotalCreatePdpRequestFwded	1.3.6.1.4.1.9.9.245.1.3.2	Counter32	read-only	This object gives the total number of create PDP requests forwarded by the GDM to GGSN. This includes retransmissions too.
C32 cgdCreateRequestRejected	1.3.6.1.4.1.9.9.245.1.3.3	Counter32	read-only	This object gives the total number of create PDP requests rejected by the GGSN.
C32 cgdTotalUnsupportedMessages	1.3.6.1.4.1.9.9.245.1.3.4	Counter32	read-only	GDM does not support any signalling message other than create PDP request. If the GDM receives any unsupported signalling message, it will not be forwarded to GGSN and will be dropped. This object gives the total number of unsupported signalling messages received by the GDM.
C32 cgdPdpRequestDropped	1.3.6.1.4.1.9.9.245.1.3.5	Counter32	read-only	This object gives the total number of PDP requests dropped by the GDM due to routing failures, which occur, if the GTP is unable to pass the packet to IP.
cgdNotifMgmt	1.3.6.1.4.1.9.9.245.1.4
T/F cgdNotifEnable	1.3.6.1.4.1.9.9.245.1.4.1	TruthValue	read-write	Indicates whether ciscoGtpDirectorNotifications notification will be sent when it is generated by the device. - 'true', will enable the device to send the notification. - 'false', will prevent the device from sending out the notification.
INT cgdNotifType	1.3.6.1.4.1.9.9.245.1.4.2	INTEGER	accessible-for-notify	This object indicates the type of notification.
ciscoGtpDirectorNotifPrefix	1.3.6.1.4.1.9.9.245.2
ciscoGtpDirectorNotifications	1.3.6.1.4.1.9.9.245.2.0
NTF ciscoGtpDirectorNotification	1.3.6.1.4.1.9.9.245.2.0.1			This notification indicates the occurrence of a GDM related alarm.
ciscoGtpDirectorMIBConformance	1.3.6.1.4.1.9.9.245.3
ciscoGtpDirectorMIBCompliances	1.3.6.1.4.1.9.9.245.3.1
ciscoGtpDirectorMIBCompliance	1.3.6.1.4.1.9.9.245.3.1.1			The compliance statements for entities which implement CISCO-GDM-MIB.
ciscoGtpDirectorMIBGroups	1.3.6.1.4.1.9.9.245.3.2
ciscoGtpDirectorConfigurationsGroup	1.3.6.1.4.1.9.9.245.3.2.1			A collection of GDM configuration objects.
ciscoGtpDirectorStatusGroup	1.3.6.1.4.1.9.9.245.3.2.2			A collection of GDM status.
ciscoGtpDirectorStatisticsGroup	1.3.6.1.4.1.9.9.245.3.2.3			A collection of GDM Statistics.
ciscoGtpDirectorNotifMgmtGroup	1.3.6.1.4.1.9.9.245.3.2.4			A collection of objects related with notification management on GDM.
ciscoGtpDirectorNotifGroup	1.3.6.1.4.1.9.9.245.3.2.5			A collection of notifications.

RFC description

MIB module for managing GTP Director modules in GPRS networks, enabling service providers to dynamically route access point requests.

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Download CISCO-GTP-DIRECTOR-MIB