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SGSN9810 Gr Interface Data Configuration
ISSUE2.0
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References
HUAWEI SGSN9810 Serving GPRS Support Node
Operation Manual Data Configuration l (V8.60)
3GPP TS 29002 MAP Protocol
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Objectives
Upon completion of this course, you will be able to:
Describe the protocol stack and main functions of the Gr interface.
Configure the data for the Gr over TDM interface.
Configure the data for the Gr over IP interface.
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Contents
1. Basic Concepts
2. Data Configuration for the Gr over TDM Interface
3. Data Configuration for the Gr over IP Interface
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Contents
1. Basic Concepts
2. Data Configuration for the Gr over TDM Interface
3. Data Configuration for the Gr over IP Interface
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Gr Interface
The Gr interface is a mandatory interface between the
serving GPRS support node (SGSN) and the home location
register (HLR) in a GSM or UMTS network.
On the entire network, the Gd/Gs/Ge/Gf/Lg interface is the
same as the Gr interface and based on the SS7 signaling
network.
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Gr Interface Protocol Stack Gr over TDM
The protocol stack of the Gr over TDM interface consists of Message Transfer Protocol
(MTP), Signaling Connection Control Part (SCCP), Transaction Capability Application Part
(TCAP), and Mobile Application Part (MAP).
Gr over IP
The protocol stack of the Gr over IP interface consists of Internet Protocol (IP), Simple
Control Transmission Protocol (SCTP), MTP3 User Adaptation (M3UA), SCCP, TCAP,
and MAP. MAP
TCAP
SCCP
MTP3
MTP2
MTP1
MAP
TCAP
SCCP
M3UA
SCTP
IP
Gr over TDM Gr over IP
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Boards Related to the Gr Interface
SS7 over E1
MAP/CAP BSSAP
+
ECU
TCAP
SCCP
MTP3
MTP2 ETI
MTP1 ETI
SS7 over IP
MAP/CAP BSSAP+ ECU
TCAP
SCCP
M3UA ECU
SCTP
IP/L2/L1 EPU/PFI
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Related Processes
SPP
Based on the user international mobile subscriber identity (IMSI), the
signaling processing process (SPP) assigns the short data burst
(SDB) table and creates user contexts. The user context reserves the
authentication sets, subscription data, and access data.
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Addressing Mode of the Gr Interface
According to the address numbering plan of the SS7 signaling network, there are
two addressing modes for the Gr interface:
DPC or DPC+SSN
DPC+GT
The HLR needs to be set with two different global title (GT) numbers:
HLR number: The numbering plan is ISDN. It is used to address the HLR when
the HLR message is replied.
IMSI number: The numbering plan is MSISDN. It is used for the HLR initial
addressing after the routing area is updated.
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Comparison Between DPC and DCP+SSN
When the DPC+SSN addressing mode is used, the subsystem
number (SSN) in the SCCP message is the SSN that configured
in the SCCPGT.
When the DPC addressing mode is used, the SSN in the SCCP
message is the SSN that sent form the user layer to the SCCP.
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MTP3 Load-sharing DPC or DPC+SSN
Two-level load-sharing
One level is route load-sharing or link set load-sharing.
The other level is link load-sharing. The signaling point link set selection mask (SLSSM) and
the signaling link selection mask (SLSM) are configured through the ADD N7DPC and ADD
N7LKS.
Implementation of load-sharing:
When receiving user messages from the upper layer, MTP3 determines route or link set and
link according to signaling link selection code (SLS) and destination signaling point code
(DPC).
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SCCP Load-sharing DPC+GT
1. Configure STP1 and STP2 to active/standby
2. Configure STP1 and STP2 to load-sharing
D1
OSP DSP
STP1
STP2
D2
Link set 1Link set 1
Link set 2Link set 2
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GT Structure
SCCP Address FormatSCCP address is classified as the calling and called SCCP user addresses. The
calling SCCP user address identifies the destination SCCP user and the called
SCCP user address identifies the source SCCP user. A user address is a
parameter of variable length and consists of address indicator and address. The
sequence of every unit in the address is SPC, SSN, and GT.
Su
bsy
stem
in
dica
tor
Global code indicator
Route
indica
tor
Sp
are
01234567
Sig
nalin
g p
oin
t in
dica
tor
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GT Structure
SCCP Address Format
Format of global code in the SCCP address:
7 6 5 4 3 2 1 0
Translation type
Number plan Encoding scheme
Reserve Address indicator
Address signal 2 Address signal 1
…….
Pad number (if required) Address signal N
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Contents
1. Basic Concepts
2. Data Configuration for the Gr over TDM Interface
3. Data Configuration for the Gr over IP Interface
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SS7 Links Configuration Guidelines
At least two SS7 links are required between the SGSN and
a neighboring signaling point.
To ensure the security, you must configure all the links in an
office evenly among the ECUs in different subracks of an
SGSN.
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GT Configuration Guidelines
Addressing mode:
Scheme 1: Use the DPC addressing mode to transmit MAP and CAP
messages for signaling points inside a province. Use the GT addressing
mode to transmit MAP and CAP messages for signaling points outside a
province.
Using the DPC addressing mode, the STP load is light but the data configuration for the
SGSN is high.
Scheme 2: Use the GT addressing mode to transmit messages for signaling
points inside or outside a province.
Using the GT addressing mode, the STP load is heavy but the data configuration for the
SGSN is low.
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Configuration Restrictions for the SGSN
For all links destined for the same DPC, up to 16 links can take effect. If
more than 16 links are configured, the remaining ones are idle.
The SLSSM in the ADD N7RT command and SLSM in the ADD N7DPC
command cannot have the same bit value as 1.
For example, when SLSSM is B0001, the maximum value of SLSM is B1110.
If multiple STPs are used for forwarding messages and multiple links are
configured to share loads destined for each STP, you can use the following
mitigation methods:
For SLSSMs destined for different signaling points, set different bit values to 1.
For example, set SLSSM of DPC=0x9fe10 to B0001 and that of DPC=0x9fe11 to
B0010.
Use the 2 Mbit/s link to provide broader bandwidth.
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Networking Example
ETI
ETI
ECU
ECU
0
Sub2
Slot
0
Sub4
Slot
SGSNSGSN
HLR1HLR1link5link5
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Networking Data
Item Value Item ValueSGSN SPC CC0001 HLR SPC EE0000SGSN GT 8613900757 HLR GT 8613900756
MCC 460 MNC 07CC 86 NDC 139
IMSI Number Segment in HLR 46007755Translation Type DPC
Item Frame No. Slot
No.
Port No. Link
Rate
Timeslot
ID
SLC
1 0 2 2 64 Kbit/s 16 1
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Step Operation Command
Configure the hardware.1 Set the operation mode for ETI. SET ETICFG2 Set the E1 port. SET ET1PORT
Set the attributes for the signaling network.
3Set the signaling network attributes
for the local SGSN. SET SIGATTR
Set the MTP3.
4Add MTP originating signaling point
code (OPC). ADD N7OPC
5 Add the MTP DPC. ADD N7DPC6 Add the MTP link set. ADD N7LKS
7 Add the MTP route. ADD N7RT
8 Add the MTP link. ADD N7LNK
Procedure for Data Configuration
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Step Operation Command
Configure SCCP.
9 Add SCCP OPC. ADD SCCPOPC10 Add SCCP DPC. ADD SCCPDPC11 Add SCCP subsystem to the SGSN. ADD SCCPSSN
12 Add SCCP subsystem to the HLR. ADD SCCPSSN
Configure the GT translation table.
13Configure the conversion between
IMSI and GT. ADD IMSIGT
14Configure the SCCP GT for the local
SGSN. ADD SCCPGT
15Configure the SCCP GT for the
destination HLR. ADD SCCPGT
Procedure for Data Configuration
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Step 1: Set the operation mode for ETI.
SET ETICFG
This command is used to configure:
ETI operation mode
Example:
SET ETICFG: SRN=0, SN=2, CFGTDMTYPE=E1,
E1IMPED=E1_75ohm, CFGAPPMODE=FR;
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Step 2: Set the E1 port.
SET ET1PORT
This command is used to set the port position of the E1 link.
Certain parameters need to be negotiated with the peer
device.
Example:
SET ET1PORT: SRN=0, SN=2, STRPORTID=1,
ENDPORTID=31, CFGTDMTYPE=E1, CFGE1FRM=DF,
CFGE1ENC=HDB3, TRANSMODE=SHORTLINE;
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Step 3: Configure the local office information.
ADD HPLMN
This command is used to configure the first public land mobile
network (PLMN) number for the SGSN.
ADD HPLMN: MCC="460", MNC="07", CC="86";
SET SIGATTR
This command is used to set the attributes of the signaling
network.
SET SIGATTR: IF=INVALID, IRF=INVALID, NF=LABEL24,
NRF=LABEL14, MAPNI=INT, CAPNI=INT, SS7T=ITUT_SS7;
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Step 4: Add an MTP OPC.
ADD N7OPC
This command is used to add an MTP OPC.
ADD N7OPC: OPX=1, NI=NAT, OPC="CC0001";
– OPX
– NI (network indication)
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Step 5: Add an MTP DPC.
ADD N7DPC
This command is used to add an HLR DPC.
ADD N7DPC: DPX=3, OPX=1, DPC="EE0000", SLSSM=B0000,
ADJF=TRUE, DPN="HLR1";
– Only one route: SLSSM=B0000
– Direct route: adjacent node
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Step 6: Add an MTP link set.
ADD N7LKS
This command is used to add an MTP link set.
ADD N7LKS: LSX=2, DPX=3, SLSM=B0000, LSN="HLR1";
– Only one link set: SLSM=B0000
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Step 7: Add an MTP route.
ADD N7RT
This command is used to add an MTP route.
ADD N7RT: RTX=3, DPX=3, LSX=2, PRI=0, RTN="HLR1";
SGSN HLR1Link set 2
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Step 8: Add an MTP link.
ADD N7LNK
This command is used to add an MTP link.
ADD N7LNK: SRN=0, SN=2, LNK=2, RATET=LINK_E1_64K,
TS=80, LSX=2, SLC=1, SLCS=1;
SGSN HLR1Link set 2
Link 1
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Step 9: Add an SCCP OPC.
ADD SCCPOPC
This command is used to add an SCCP OPC.
Example:
ADD SCCPOPC: OPX=1, NI=NAT, OPC="CC0001",
SPN=COREONLY, SGSNN=" 8613900757";
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Step 10: Add an SCCP DPC.
ADD SCCPDPC
This command is used to add an SCCP DPC.
ADD SCCPDPC: DPX=3, OPX=1, DPC="EE0000",
DPN="HLR1";
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Step 11: Configure SSNs.
SSN OPC DPC
SGSN SGSN's SPC SGSN's SPC
SCMG (SGSN) SGSN's SPC SGSN's SPC
HLR SGSN's SPC HLR's SPC
SCMG (HLR) SGSN's SPC HLR's SPC
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Step 12: Configure SCCP subsystems. ADD SCCPSSN
ADD SCCPSSN: SSNX=0, SSN=SCMG, NI=NAT,
DPC="CC0001", OPC="CC0001",
SSNNAME="SGSN";
ADD SCCPSSN: SSNX=1, SSN=SGSN, NI=NAT,
DPC="CC0001", OPC="CC0001",
SSNNAME="SGSN";
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Step 13: Configure the SCCP Subsystem of the HLR.
ADD SCCPSSN
ADD SCCPSSN: SSNX=4, SSN=SCMG, NI=NAT,
DPC="EE0000", OPC="CC0001", SSNNAME="HLR1";
ADD SCCPSSN: SSNX=5, SSN=HLR, NI=NAT,
DPC="EE0000", OPC="CC0001", SSNNAME="HLR1";
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Step 14: Configure the IMSTGT table.
ADD IMSIGT
Configure the IMSI GT translation table.
ADD IMSIGT: IMSI="46007", GT="86139";
Attach request (IMSI)
SGSN HLR
IMSI=46007 7551237567
GT =86139 7551237567
SCCPGT=DPC (HLR/STP)
DPC (HLR/STP)
MTP LINK
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Step 15: Configure the SCCP GT translation table. ADD SCCPGT
Configure the SCCP GT translation table for the local SGSN.
For the SGSN, you need to configure the SCCP GT
according to the SGSN No.; otherwise, transmission of
SCCP layer messages will fail.
ADD SCCPGT: GTX=0, NI=NAT, RT=DPC, NP=ISDNP,
ADDR="8613900757", DPC="CC0001", NAME="SGSN";
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Step 16: Configure the SCCP GT translation table of HLR.
ADD SCCPGT
Configure the SCCP GT translation table of the IMSI number
segment:
ADD SCCPGT: GTX=1, NI=NAT, RT=DPCSSN, NP=ISDNMS,
ADDR="86139755", DPC="EE0000", SSN=HLR,
NAME="HLR1";
Configure the GT translation table of the HLR number:
ADD SCCPGT: GTX=2, NI=NAT, RT=DPCSSN, NP=ISDNP,
ADDR="8613900756", DPC="EE0000", SSN=HLR,
NAME="HLR1";
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GT Configuration Specification
In SCCP GT translation table, the GT translation of the
following number/number segments are required:
Domestic/International IMSI number segment
Number of local SGSN
Domestic/International HLR number segment
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GT Configuration Specification
Number Type Numbering Plan
Translation Type
Destination Number Segment to Be Configured
IMSI number E.214, ISDN/mobile numbering planNP=ISDNMS
DPCGT (DPC+GT)
HSTP 1, 2, 3, 4, 5, 6, 7, 8, 9
Local SGSN number
E.164, ISDN/telephone numbering planNP=ISDNP
DPC SGSN SGSN number
HLR number E.164, ISDN/telephone numbering planNP=ISDNP
DPCGT (DPC+GT)
HSTP 1, 2, 3, 4, 5, 6, 7, 8, 9
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MTP Layer Test
Check SS7 link status:
DSP N7LNK
Check link route status:
DSP N7RT
Check DPC status:
DSP N7DPC
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SCCP Layer Test
Check SCCP DPC status:
DSP SCCPDPC
Check SCCP subsystem status:
DSP SCCPSSN
Check GT translation:
TST SCCPGT
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SCCP Layer Test
In SCCP message tracing, how to check whether the Gr interface
is normal?
The SCCP status can be displayed by running DSP SCCPDPC
and DSP SCCPSSN. When SCCP status is normal, if an upper
layer message is not delivered on the SCCP layer, the reason is
the incorrect configuration of the GT code. Find a MAP message
in Gr interface tracing, for example, the location update request.
Then, find whether there is a corresponding message in SCCP
tracing. If yes, the SCCP layer is normal. If no, check the GT code
configuration.
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Contents
1. Basic Concepts
2. Data Configuration for the Gr over TDM Interface
3. Data Configuration for the Gr over IP Interface
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SIGTRAN Definition
The Signaling Transport (SIGTRAN) protocol stack has two
layers: Transfer protocol layer (SCTP) and adaptation
protocol layer (M3UA and IUA).
The SGSN9810 implements only M3UA.
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Basic Concepts The M3UA refers to the SS7 MTP3 user adaptation protocol. It is used
together with the Stream Control Transmission Protocol (SCTP) to
transmit SS7 MTP3 user signaling messages, namely, the SCCP
messages, through the IP network. The protocol elements allow MTP3
peer users to carry out seamless operations in the SS7 and IP
domains.
SCTP is the reliable datagram transmission protocol based on
unreliable transmission service protocols, such as IP. The upper layer
of SCTP is SCTP user application layer and the lower layer of SCTP is
packet network layer. SCTP provides highly efficient and reliable
services for M2UA, M3UA, IUA, and H.248 signaling.
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SIGTRAN-based SGSN-HLR Networking
M3UA link
IP connection
HLR SGSN
SCCP
IP
SCTP
M3UA
IP
SCTP
M3UA
SCCP
IP
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SIGTRAN-based SGSN-HLR Networking
HLR SG SGSN
MTP1
MTP2
MTP3
SCCP
MTP1
MTP2
MTP3
IP
SCTP
M3UA
IP
SCTP
M3UA
SCCP
No.7 IP
M3UA link
IP connectionTDM connection
MTP link
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Networking Between the SGSN and the HLR
Two networking modes exist between the SGSN and the
HLR:
SGSN directly connecting with the local HLR
SGSN connecting with the local HLR through the SG
SGSN connecting with the HLR of users roaming in the local network
SGSN connecting with the HLR of users roaming in external networks
SGSNHLR n
SG1
SG2
HLR1
IP
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Configuration Procedure
Step Operation Command
Add related boards.
1Set the operating mode for the IP
interface.MOD PORT
2 Configure the interface IP address. ADD IFIP
3Configure the IP address for the
EPU.ADD BRDIP
Configure signaling network attributes.
4Configure the signaling network
attributes for the SGSN. SET SIGATTR
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Configuration Procedure
Step Operation Command
Configure the M3UA layer data.
5 Add the M3UA local entity. ADD M3LE
6Add the M3UA destination
entity. ADD M3DE
7Add the M3UA signaling link
set. ADD M3LKS
8 Add the M3UA signaling route. ADD M3RT
9 Add the M3UA signaling link. ADD M3LNK
10Configure the IP route destined
for the destination entity.ADD IPRT
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Configuration Procedure
Step Operation Command
Configure the SCCP layer data.
11 Configure the SCCP DPC. ADD SCCPDPC
12Configure the SCCP
subsystem.ADD SCCPSSN
Configure the GT translation data.
13Configure the IMSI-GT
conversion.ADD IMSIGT
14Configure the GT translation
data.ADD SCCPGT
Note: The data configuration from Step 11 to Step 14 is the same as that of Gr over TDM. Thus, the configuration steps are not described in this part.
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Networking Example
8 9
11 13
SS
SGSNSGSN
PF
I
PF
I
RR
EP
U
EP
U
11
EC
U
4
EC
U
5E
PU
HLR
Logical IP
Physical port
DATA SIGTRAN
IP
address
HLR IP
address
EP
U
13
10.40.40.1
220.0.0.1/2
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Networking Data
Board/Slot IP Address Operating Mode
EPU0/11 220.0.0.1 Active
0/13 220.0.0.2 Active
PFI0/11
10.40.40.1Active
0/13 Standby
IP address
of the router10.40.40.2
IP Address of the Local End of the
M3UA LinkPort HLR IP Address Port
M3UA link220.0.0.1 2000 230.0.0.1 2000
220.0.0.2 2001 230.0.0.1 2001
OPC DPC
CC0001 EE0001
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Step 1: Set the Operating Mode for the IP Interface
MOD PORT Example:
n MOD PORT: SRN=0, SN=11, PORTTYPE=EETH_PFI,
PORTNAME=Card1/Lan0, PEERSN=13, PEERPNAME=Card1/Lan0;
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Step 2: Set the IP address for the Interface
ADD IFIP
p ADD IFIP: SRN=0, SN=11, PN=0, IP="10.40.40.1",
MSK="255.255.255.0";
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Step 3: Set the IP address for the EPU
ADD BRDIP
Example:
ADD BRDIP: SRN=0, SN=11, MSTYPE=PRIMARY, IPT=IPV4,
IPV4="220.0.0.1";
ADD BRDIP: SRN=0, SN=13, MSTYPE=PRIMARY, IPT=IPV4,
IPV4="220.0.0.2";
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Step 4: Set Signaling Network Attributes
SET SIGATTR
This command is used to set signaling network attributes.
SET SIGATTR: IF=INVALID, IRF=INVALID, NF=LABEL24,
NRF=LABEL14, MAPNI=INT, CAPNI=INT, SS7T=ITUT_SS7;
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M3UA Entity Type
M3UA link
IPSPIPSP
SGSN HLR
M3UA link
SGPASP
SGSN HLRSGMTP3 link
SP
ASP Application Server Process
SGP Signaling Gateway Process
IPSP IP Server Process
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Step 5: Configure the Local Entity
ADD M3LE
This command is used to add local entities.
Example:
ADD M3LE: LEX=1, NI=NAT, OPC="CC0001", LET=IPSP;
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Step 6: Configure the Destination Entity
ADD M3DE
This command is used to add the destination entity.
Example:
ADD M3DE: DEX=1, LEX=1, DPC="EE0001", SLSSM=B0000,
DET=IPSP, ADJF=TRUE, RC=2, PVER=RFC3332, DEN="HLR";
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Step 7: Configure the M3UA Link Set
ADD M3LKS
This command is used to add the M3UA link set. Only one
link set can be configured between two adjacent M3UA
entities.
Example:
ADD M3LKS: LSX=1, ADX=1, SLSM=B0001, WM=IPSP,
TM=LOADSHARE, LSN="TO HLR";
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Traffic Mode
OVERRIDE (active and standby): 1+N backup in this mode, there is only one
link is in active status while all others are standing by. When the active link is
faulty, one of the standby links are activated and start transmitting.
LOADSHARE (load-sharing): In this mode, all the links in the link set are active
and share the traffic load.
1+N backup mode
Active
Standby
Load-sharing mode
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Step 8: Configure the Route
ADD M3RT
This command is used to configure the M3UA route destined for the
HLR.
Example:
ADD M3RT: RTX=1, DEX=1, LSX=1;
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Step 9: Configure the M3UA Link
ADD M3LNK
ADD M3LNK: SRN=0, SN=14, LNK=1, IPT=IPv4,
LOCIPV41="220.0.0.1", LOCPORT=2000, PEERIPV41="230.0.0.1",
PEERPORT=2000, CS=S, LSX=1;
ADD M3LNK: SRN=0, SN=15, LNK=1, IPT=IPv4,
LOCIPV41="220.0.0.2", LOCPORT=2001, PEERIPV41="230.0.0.1",
PEERPORT=2001, CS=S, LSX=1;
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Step 10: Configure the IP Route
ADD IPRT
This command is used to add the IP route to forward the IP packets to
the HLR.
Example:
ADD IPRT: IP="230.0.0.1", MSK="255.255.0.0",
GATE="10.40.40.2";
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Transmission Test
Step Operation Note
1 Run PING to check whether the M3UA
link between the source IP address and
the destination IP address is normal.
If the result shows that the link is
disconnected, check whether the route
configuration is correct.
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Checking M3UA Interface Status
Check the signaling link status:
DSP M3LNK
Check the signaling route status:
DSP M3RT
Check the destination entity status:
DSP M3DE
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