CISCO-GPRS-ISGSN-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1998-10-15

Category: Cisco Devices, Mobile IP, Telephony and VoIP

Description: Provides management objects for monitoring the Cisco iSGSN (intelligent Serving GPRS Support Node) in GPRS mobile network deployments.

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What Is CISCO-GPRS-ISGSN-MIB?

CISCO-GPRS-ISGSN-MIB manages the Cisco/Alcatel iSGSN (intelligent Serving GPRS Support Node) protocol used in GPRS mobile network cores, specifically the high-layer protocol that carries traffic over the Gn interface between the Telecom (T-unit) and Datacom (D-unit) portions of the SGSN architecture. It exposes traffic and error counters for packets and octets exchanged with the T-node (Telecom unit), covering both received and transmitted directions. This MIB is oriented toward performance and fault monitoring of the mobile packet-core signaling/data path rather than physical hardware sensors: operators track packet/octet throughput and error counts on the Gn-facing link to detect degraded or failing communication between the SGSN's Telecom and Datacom units. It is specific to the Cisco/Alcatel SGSN architecture and depends on that vendor-specific T-unit/D-unit split rather than a generic IETF GPRS MIB. It is deployed in mobile operator core networks running Cisco/Alcatel SGSN equipment for 2G/3G packet-switched GPRS service. Engineers can download the CISCO-GPRS-ISGSN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-GPRS-ISGSN-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/Alcatel SGSN (Serving GPRS Support Node)

Monitoring Examples

An administrator would poll cgprsIsgsnRxPacketCountFromTnode and cgprsIsgsnTxPacketCountToTnode alongside cgprsIsgsnRxOctetCountFromTnode/cgprsIsgsnTxOctetCountToTnode to baseline normal Gn-interface traffic volume between the SGSN's T-unit and D-unit. A rising cgprsIsgsnErrorCountRxFromTnode or cgprsIsgsnErrorCountRxToTnode relative to packet counts would indicate a degrading internal communication path within the SGSN, prompting investigation before it affects subscriber data sessions. These counters live under ciscoGprsIsgsnStats within ciscoGprsIsgsnMIBObjects.

What Can Be Monitored

Rx/Tx packet counts to/from T-node
Rx/Tx octet counts to/from T-node
Rx error counts to/from T-node

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cgprsIsgsnRxPacketCountFromTnode OID:

Select a Cisco/Alcatel SGSN (Serving GPRS Support Node) 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 cgprsIsgsnRxPacketCountFromTnode into the Find box to locate it in the OID tree, then select it and click OK. It reports the number of packets received from the T-node, by iSGSN protocol component on the D-node. 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 (in packets), 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
ciscoGprsIsgsnMIB	1.3.6.1.4.1.9.9.9992			The MIB Module for managing the General Packet Radio Service(GPRS) iSGSN protocol on Servicing GPRS Support Node (SGSN). In the Alcatel/Cisco SGSN architecture, a Telecom part (T-unit) and Datacom part (D-unit) have been defined. The Datacom part is in charge of managing the Gn interface with the GPRS backbone. The Telecom part is in charge of managing the Gb interface with the BSS. The iSGSN protocol is the high layer protocol of the interface between the Datacom part and Telecom part. It supports the relay function between the Gb and Gn protocol stacks, and intra SGSN nodes management.
ciscoGprsIsgsnMIBObjects	1.3.6.1.4.1.9.9.9992.1
ciscoGprsIsgsnStats	1.3.6.1.4.1.9.9.9992.1.1
C32 cgprsIsgsnRxPacketCountFromTnodeEx	1.3.6.1.4.1.9.9.9992.1.1.1	Counter32	read-only	Number of packets received from the T-node, by iSGSN protocol component on the D-node.
C32 cgprsIsgsnTxPacketCountToTnode	1.3.6.1.4.1.9.9.9992.1.1.2	Counter32	read-only	Number of packets transmitted by the D-node iSGSN protocol component, to its peer on the T-node.
C32 cgprsIsgsnRxOctetCountFromTnode	1.3.6.1.4.1.9.9.9992.1.1.3	Counter32	read-only	Number of octets received from the T-node, by iGSN protocol component on the D-node.
C32 cgprsIsgsnTxOctetCountToTnode	1.3.6.1.4.1.9.9.9992.1.1.4	Counter32	read-only	Number of octets transmitted by the D-node iSGSN protocol component, to its peer on the T-node.
C32 cgprsIsgsnErrorCountRxFromTnode	1.3.6.1.4.1.9.9.9992.1.1.5	Counter32	read-only	Number of errors due to illegal or bad packets received from the T-node, by iSGSN protocol component on the D-node.
C32 cgprsIsgsnErrorCountRxToTnode	1.3.6.1.4.1.9.9.9992.1.1.6	Counter32	read-only	Number of errors attributable to the transmision of bad or illegal packets transmitted by the D-node iSGSN protocol component, to its peer on the T-node.
ciscoGprsIsgsnConformances	1.3.6.1.4.1.9.9.9992.3
cgprsIsgsnGroups	1.3.6.1.4.1.9.9.9992.3.1
cgprsIsgsnStatsGroup	1.3.6.1.4.1.9.9.9992.3.1.1			A collection of statistics for ISGSN.
cgprsIsgsnCompliances	1.3.6.1.4.1.9.9.9992.3.2
cgprsIsgsnCompliance1	1.3.6.1.4.1.9.9.9992.3.2.1			The compliance statement for the system that supports ISGSN protocol.

RFC description

Manages GPRS (General Packet Radio Service) iSGSN protocol on Serving GPRS Support Nodes.

Start monitoring Cisco/Alcatel SGSN (Serving GPRS Support Node) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-GPRS-ISGSN-MIB