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Engineering Rules

• Engineering Rules, on page 1• Service Rules, on page 1• SGSN Connection Rules, on page 2• Operator Policy Rules, on page 3• SS7 Rules, on page 5• SGSN Interface Rules, on page 7

Engineering RulesThis section provides SGSN-specific (2G, 3G, S4-SGSN related) common engineering rules or limit guidelinesfor the current release. These limits are hardcoded into the SGSN system and are not configurable. The limitsare documented here because they should be considered prior to configuring an SGSN for network deployment.

Generic platform and system rules or limits can be found in the "Engineering Rules" appendix in the SystemAdministration Guide.

Service RulesThe following engineering rules define the limits for the various services configured on the SGSN (system):

Maintaining a large number of services increases the complexity of management and may impact overallsystem performance. Therefore, we recommend that you limit the number of services that you configure andthat you talk to your Cisco Service Representative for optimization suggestions and additional informationon service limits.

Note

Table 1: Service Rules for the SGSN

CommentsLimitsFeatures

This limit includes the number ofGPRS services, SGSN services,SGTP services, IuPS Services, andMAP Services.

256Maximum number of (all) services(regardless of type) configurableper SGSN (system).

Engineering Rules1


When configured for S4-SGSN.

The same eGTP service should beassociated with both the GPRS andthe SGSN service.

1Max. number of eGTP servicessupported by a GPRS/SGSNservice.

When configured for S4-SGSN.1Max. number of HSS peer servicessupported by a single GPRS orSGSN service.

Although the limit is 1 Gs Serviceconfigured per GPRS Service orSGSN Service, SGSN service canaccess multiple Gs Services usingOperator Policies.

1Max. number of Gs servicessupported by a single GPRS orSGSN service.

Although the limit is 1 MAPService configured per GPRSService or SGSN Service, theGPRS or SGSN service can accessmultiple MAP Services usingOperator Policies.

1Max. number of MAP servicessupported by a single GPRS (2G)or SGSN (3G) service.

12Max. number of Gs servicessupported on an SGSN (system)

128Maximum number of LACs per Gsservice

1Max. number of MAP Serviceconfigurations supported by asingle SCCP network.

Although the limit is 1 SGTPService configured per GPRSService or SGSN Service, theGPRS or SGSN service can accessmultiple SGTP Services usingOperator Policies.

1Max. number of SGTP servicessupported by a single GPRS orSGSN service.

SGSN Connection RulesThe following limitations apply to both 2G and 3G SGSNs.

Engineering Rules2

Engineering RulesSGSN Connection Rules

Table 2: Connection Rules for the SGSN


5 (unused) + 5 (used)Triplets/Quituplets

5Maximum number of entryauthentication triplets (RAND,SRES, and KC) and quintupletsstored per MM context

Limit would be based on thenumber of routes if directlyconnected. No limit if GT is used.

no limitMaximum number of logicallyconnected SMSCs

Limit would be based on thenumber of routes if directlyconnected. No limit if GT is used.

no limitMaximum number of logicallyconnected HLRs

SGSN will be connected to only 1EIR.

1Maximum number of logicallyconnected EIRs

System supports a max of 128LACs per Gs service and a max of12 Gs service.

see commentMaximum number of logicallyconnected MSCs

11Maximum number of concurrentPDP contexts per active user

20000Maximum number of logicallyconnected GGSNs per Gn/Gpinterface

- Minimum of 2KB/subscriber.

- Maximum of 10KB/subscriber --if buffers are available in the sharedpool*. (*SGSN provides a commonbuffer pool for 2G and 3Gsubscribers of 10M per sessionmanager buffers to be shared by allsubscribers "belonging" to thatsession manager.)

- Additional 2G subscriber bufferpool in BSSGP.

see commentMaximum number of packetsbuffered while other engagement

Maximum number of packetsbuffered in suspended state

Maximum number of packetsbuffered during RAU

Operator Policy RulesThe following engineering rules apply for the entire system when the system is configured as an SGSN.

The limits listed in the table below are applicable for a standalone SGSN application . Limits may be lowerwhen using a PSC1 or in combo nodes, such as SGSN+GGSN.

Engineering Rules3

Engineering RulesOperator Policy Rules

Table 3: Operator Policy Limits Applicable to the SGSN


Includes the 1 default policy.1000Maximum number of OperatorPolicies

1000Maximum number of Call-ControlProfiles

1000Maximum number of APN Profiles

1000Maximumnumber of IMEI Profiles

1000Maximum number of APN RemapTables

300Maximum number of APN remapentries per APN Remap Table

1000Maximum number of IMSI rangesunder SGSN mode

128Maximum number of IMEI rangesper operator policy

128Maximum number of APN profileassociations per operator policy

1Maximum number of Call-ControlProfiles per Operator Policy

1Maximum number of APN remaptables per Operator Policy

16Maximum number of EIR Profiles

16Maximum number ofcongestion-action-profiles

Call-Control Profiles

Mandatory to configure the IMSIrange. Limit per call-control profile.

15Maximum number of equivalentPLMN for 2G and 3G

Limit per call-control profile.15Maximum number of equivalentPLMN for 2G

Limit per call-control profile.15Maximum number of equivalentPLMN for 3G

Limit per PLMN.256Maximum number of static SGSNaddresses

5Maximum number of location areacode lists

Engineering Rules4

Engineering RulesEngineering Rules


100Maximum number of LACs perlocation area code list

10Maximum number of allowed zonecode lists

For Release 12.2no limitMaximum number of allowed zonecode lists

100Maximum number of LACs perallowed zone code list

2Maximum number of integrityalgorithms for 3G

3Maximum number of encryptionalgorithms for 3G

APN Profiles

1000Maximum number of APN profiles

16Maximum number of gatewayaddresses per APN profile

SS7 Rules

SS7 RoutingTable 4: SS7 Routing Rules for SGSN


12Maximum number of SS7 routingdomains supported by an SGSN

This includes the self point code ofthe peer-server.

2048Maximum number of SS7 routessupported by an SGSN

2048Maximum number of routespossible via a link-set

This includes one route for thepeer-server and 2047 indirectroutes.

2048Maximum number of routespossible via peer-server

16Maximum number of differentlevels of priority for link sets usedin a single route set

Engineering Rules5

Engineering RulesSS7 Rules

SIGTRANTable 5: SIGTRAN Rules for SGSN


512Maximum number of peer serversper LinkMgr

256Maximum number of peer serversper SS7RD

12Maximumnumber of PSPs per peerserver

12Maximum number of ASPs perSS7RD

2Maximum number of SCTPendpoints per ASP

2Maximum number of of SCTPendpoints per PSP

5Maximum number of SCTPendpoints per PSP (dynamicallylearnt)

Broadband SS7Table 6: Broadband SS7 Rules for SGSN


512Maximum number of MTP3linksets

256Maximum number of MTP3linksets per SS7RD

16Maximum number of MTP3 linksper linkset

256Maximum number of MTP3 linksper combined linkset

Engineering Rules6

Engineering RulesSIGTRAN

SCCPTable 7: SCCP Rules for SGSN


12Maximum number of SCCPnetworks

2048Maximum number of destinationpoint codes (DPCs)

3Maximum number of SSNs perDPC

GTTTable 8: GTT Rules for SGSN


16Maximum number of associatedGTTs

15Maximum number of actions perassociation

4096Maximum number of address maps

20Maximumnumber of out-addressesper address map

SGSN Interface RulesThe following information relates to the virtual interfaces supported by the SGSN:

System-LevelTable 9: System Rules on the SGSN


1480Maximum supported size for IPpackets (data)

17 mins.Maximum recovery/reload time

Engineering Rules7

Engineering RulesSCCP

3G Interface LimitsTable 10: 3G Interface Rules for SGSN


Supports upto 256 directlyconnected RNC and 1024 indirectlyconnected through gateways.

See commentMaximum number of RNCs

no limitMaximum number of RNCscontrolling the same RA

16K is the recommended max RAIper SGSN, however, there is nohard limit imposed. Adding moreRAIs may lead to memory issues.

16KMaximum number of RAIs perSGSN

2.5KMaximum number of RAIs perRNC

12Maximum number of GTPUaddresses per SGTP service

2G Interface LimitsTable 11: 2G Interface Rules - Gb over Frame Relay


Limit is total of FR + IP2048Maximum number of NSEs



2.5KMaximum number of RAIs perNSE

no limitMaximum number of NSEscontrolling the same RA

128Maximum number of NSVCs perNSE

Whether or not Gb Flex is enabled.max / SGSN is 64000Maximum number of BVCs perNSE

64,000Maximum number of cell sitessupported

Engineering Rules8

Engineering Rules3G Interface Limits

Table 12: 2G Interface Rules - Gb over IP


Limit is total of FR + IP2048Maximum number of NSEs

4Maximumnumber of Local NSVLsper SGSN

128Maximum number of Peer NSVLsper NSE



2.5KMaximumnumber of RAI perNSE

no limitMaximum number of NSEcontrolling the same RA

512Maximum number of NSVCs perNSE

max / SGSN is 64000Maximum number of BVCs perNSE

64000Maximum number of cell sitessupported

1024Maximum number of 802.1qVLANs per Gb interface

2.5k is the recommended max RAIper SGSN, however, there is nohard limit imposed. Adding moreRAIs may lead to memory issues

2.5KMaximum number of RAIs perSGSN

Engineering Rules9


Engineering Rules10


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