03_LAN+_Connectivity_in_NSN_SGSN_SG7_CN3122EN70GLN00_ppt

For public use IPR applies1 Nokia Siemens Networks LAN Connectivity / TAd / 15.10.2008

SGSN Release 7 OMLAN Connectivity

2 Nokia Siemens Networks LAN Connectivity / TAd / 15.10.2008For public use IPR applies

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Document change history

Initial DraftTanti Adriyani0.115.10.2007

Change commentNameVersionDate


Objectives

After completing this module, the participant can: Describe the options for connecting the required Ethernet and

IP connection in SGSN to external networks Describe the configuration of the ESB card to an external site

switch Describe the redundancy mechanisms available for Ethernet

based connectivity in SGSN


Site connectivity

Controller Site

Core SiteNSN

SGSN

Controller Site

NSNRNC

NSNMSS

NSNGGSN NSN

CPS

Core Site

NSNHLR

GRX

Server Site

3GSGSN

PSTN

NSNGGSN

NSNMGW NSNBSC

Controller Site

MMSC relay WAP GW

MMSC DB servers

Corp.

NSNMGW

Corporate

ISP networks

NSN

BSC

Firewall cluster

Load balancing cluster

Gigabit router

Multilayer LAN switch

LAN switch


IP transport in NSN SGSN

IOCP-E (16+1)

WCDMARAN

GPRSBSS

CPU (16+1)

6 x L2 switch

MCHU (2N)

SMMU (5+1)

OMU (2N)

PAPURNC

Iu-Ps Control plane

BSS

Gb over IP

Net Act

Ga

SS7 Network

GGSN

CG

Iu-Ps User plane

O&M (Q3/OSI)

Traffica

Gn

Gr, Gd, Gf


SGSN connectivity with SG6 native hardware

VRR

P

O&MChargingSIGTRANGnSw

itchSw

itch

VRR

P

Gb over IPRANAP over IPIu GTP-USw

itchSw

itch

LANU 1

LANU 0

SWU 0

SWU 2

SWU 4

SWU 6

SWU 1

SWU 3

SWU 5

SWU 7

SMMU 0-4(CP816-A)

MCHU 0&1(CP816-A)

OMU 0&1(CP816-A) O&M LAN

Charging LAN

SS7 LAN

Gb LAN

SGSN CABINETS

Iu LAN

Gn LAN

PAPU 0-16(CP816-A)

PAPU 0-16IOCP-E

SWUs within a LANU interconnected by a shared LAN to integrate SWUs as part of DX200 HW management.

SWUs are expected to be connected by dual links to external multilayer switches.

MSTPMSTP and VRRP VRRP are recommended for redundacy at L2 andL3


SGSN connectivity with SG7 native hardware

LANU 1

LANU 0

SGSN CABINETS

Gn LAN & Iu LAN

SWU 0ESB24-A

SWU 2ESB24-A

SWU 4ESB24-A

MCHU 1

MCHU 0

LAN Management cabling

SMMU 0-5(CP816-AC)

MCHU 0&1(CP816-AC)

OMU 0&1

(CP816-AC) O&M LAN

Charging LAN

SS7 LAN

Gb LANPAPU 0-16(CP816-AC)

PAPU 0-16(IOCP-E/EA

VRR

P

O&MChargingSIGTRANGn

Gb over IPRANAP over IPIu GTP-U

VRR

P

SWU 5ESB24-A

SWU 3ESB24-A

SWU 1ESB24-A

Switch

Switch

Switch

Switch

Similar to SGSN6C solution.

Main difference: Gn and Iu interfaces share the same IOCP ports only one ESB24 pair is needed for IOCPs.


ESB26 switch unit

20 full duplex 10/100BaseT/Tx Ethernet ports in the back panel to connect SWU to different computer units and/or to another SWU for resiliency purposes

2 10/100/1000BaseT Ethernet ports 2 1000BaseSX Ethernet ports 2 10/100BaseT Ethernet ports. one RS-232 interface on the front panel for

management purposes.ports on the SWU front panel aggregate the connections of the back panel and provide uplink/downlink connection towards the multilayer site switch

1000Base-Sx(LC-connector)

1000Base-Sx(LC-connector)

10/100/1000Base-T/Tx(RJ45-connector)

10/100/1000Base-T/Tx(RJ45-connector)

10/100Base-T/Tx(RJ45-connector)


Serial port(RJ45-connector)

LED

RST


ESB24 switch unit

20 full duplex 10/100BaseT/Tx Ethernet ports in the back panel to connect SWU to different computer units and/or to another SWU for resiliency purposes

four 1Gbit/s SFP Ports one 10/100BaseT Ethernet port for manageent

purposes. one RS-232 interface on the front panel for

debugging purposes.ports on the SWU front panel aggregate the connections of the back panel and provide uplink/downlink connection towards the multilayer site switch

1Gbit/s SFP Port(RJ45 or LC connector)


Serial Port(RJ45-connector)

LED

RST




RST

OPR

SER1


Redundancy of SWUs

LANUs are replicated with load sharing In case there is a malfunction in the SWU or in the LANU, the pair

SWU/LANU takes over and provides connectivity towards the multilayer switches.

SWUs are managed by the active MCHU Within each group, SWUs are interconnected with an Ethernet interface With two active Ethernet interfaces, the MCHU can manage all SWUs.


VLANs in NSN SGSN (no VLANs at CPU)

- Gn trafficIOCP-ESWU-4, SWU-5Gn user data

- SS7 over IP (SIGTRAN) trafficSMMUSWU-0, SWU-1Signalling- O&M traffic to NetActOMUSWU-0, SWU-1O&M

- Internal SWU management traffic- Charging traffic- Lawful Interception traffic- Link to Traffica- Statistics to NetAct

MCHUSWU-0, SWU-1Charging

- Iu over IP user trafficIOCP-ESWU-4, SWU-53G RAN user data

- Gb over IP traffic- Iu over IP control traffic- Lawful Interception traffic

PAPUSWU-2, SWU-32G RAN user data3G RAN control data

Traffic typeUnit typeServing SWUVLAN function

NSN SGSN uses VLAN technology to separate the different traffic types at the switches

These VLANs are bound to the unit types of the SGSN


VLANs in NSN SGSN (VLANs at CPU)

VLANs can (and is recommended to do so) be initiated at the CPUs

In this case, the CPUs with VLANs configured, are trunked to the SWUs

SS7 over IP (SIGTRAN) trafficSMMUSWU-0, SWU-119Signaling

O&M traffic to NetActOMUSWU-0, SWU-118O&M

Internal SWU management trafficCharging traffic (GTP)Statistics to NetAct

MCHUSWU-0, SWU-117Charging

Link to TrafficaMCHUSWU-0,SWU-116Traffica

Lawful Interception trafficMCHUSWU-0,SWU-115LIC control

Lawful Interception trafficPAPUSWU-2,SWU-314LIB User Data

LRAS forwarding between PAPUsPAPUSWU-2,SWU-313LRAS forw.

Iu PS User PlaneIOCPSWU-4.SWU-512Iu User Data

Gb over IP trafficPAPUSWU-2,SWU-311Gb User Data

Gn traffic (both user data and signalling)

IOCPSWU-4, SWU-510Gn User Data

Traffic typeUnit typeServing SWUVLAN VLAN name


Multiple spanning tree regions

Site switches are Multilayer switches.

SWUs and Site switches belong to MST regionsMST regions

Site switches act as root switches

MST region contains instances where VLANs are mapped

Port priorities in SWUs and site switches must be set consistently with the MST instance configuration

VRR

PO&MChargingSIGTRANGb over IPSw

itchSw

itch

VRR

P

Switch

SwitchLANU 1

LANU 0

SWU 0

SWU 2

SWU 4

SWU 3

PAPU 0-16(CP816-A)

PAPU 0-16(IOCP-E)

SMMU 0-4(CP816-A)

MCHU 0&1(CP816-A)

OMU 0&1(CP816-A) O&M LAN

Charging LAN

SS7 LAN

Gb LAN

SGSN CABINETS

Gn &Iu LAN GnIu GTPURANAP over IP

MSTP MSTP regionregion 11

MSTP MSTP regionregion 22

MCHU 0

SWU 5

SWU 1

MCHU 1


Alternative LAN connectivity Redundant L3 connectivityfor SGSN (1/2)

L3 Connectivity means that multilayer functionality from Multilayer Site Switch is transferred to SGSNs L3 ESB (MSTP root, virtual gateway and routing)

SGSN can be connected to Site Router instead of Multilayer Site Switch In redundant L3 solution, all SGSNs have MSTP region of its own thus

Multilayer Site Switches and SGSNs are not controlled by the same spanning tree.

MSTP Region

MSTP Region

MSTP Region

MSTP Region

MSTP Region

IP backbone

NEL3 ESBs

L3

L3

L3

L3

L3

L2L2

L2

L2

L2

L2

L2

L2NEL2 ESBs


Alternative LAN connectivity Redundant L3 connectivity for SGSN (2/2) Either static or dynamic

routing (OSPF, RIP) is used between backbone routers and ESB24 SWUs.

ESB24 SWU pair form a redundant VRRP pair.

L3 loop cabling for VRRP will be connected via backplane in native SG7 NE. These cables are present but not connected by default.

Connectivity is activated by configuring IP address/route

LANU 1

LANU 0

PAPU 0-16(CP816-AC)

PAPU 0-16(IOCP-E/EA)

SMMU 0-5(CP816-AC)

MCHU 0&1(CP816-AC)

OMU 0&1

(CP816-AC) O&M LAN

Charging LAN

SS7 LAN

Gb LAN

SGSN CABINETS

Gn LAN & Iu LAN

SWU 0ESB24-A

SWU 1ESB24-A

SWU 2ESB24-A

SWU 4ESB24-A

SWU 3ESB24-A

SWU 5ESB24-A

O&M switch 1

O&M switch 2

Access NW switch 1

Access NW switch 2

Core NW switch 1

Core NW switch 2

MCHU 1

MCHU 0

LAN Management cabling

VRRP cabling


Redundancy of interfaces in computer units

LAN redundancy is further enhanced with the use of active and standby LAN interfaces and carrier-sense IP addresses.Each DX200 SGSN computer unit has two functionally independent LAN interfaces.When the CPU selects the LAN interface to be used, it also selects the SWU to be used

CPU-0EL0

EL1

L2 switch

L2 switch

L2/L3 switch

CPU-1 EL0EL1

Rapid STP for fastLAN convergence.Automatic

switchoverSGSN

L2/L3 switch


Redundancy of multilayer switches

Site switches must be interconnected physically by a redundant trunk link (802.1Q) for transporting multiple VLANsover a single physical interface

Link capacity can be increased by grouping multiple physical interfaces to one logical interface (i.e. EtherChannelEtherChannel)

Site switches support IP redundancy features, such as VRRPVRRP or HSRPor HSRP

Switch

Multilayer switch 1

Switch

Multilayer switch 2

VRRP

SWU SWU

MSTP

Domain

CPU CPU CPU CPU


Redundancy of integrated L2 switches

CPU cannot detect interface changeover if the link between the SWU and the site switch failseach SWU is connected to both of the multilayer site switches for redundancyduplicated connection creates an L2 loop between the SWU and the multilayer site switchuse of MSTP breaks the loops by disabling loop causing interfaces.MSTP provides fast failure recovery by enabling previously disabled ports if needed during topology changes

Switch

Multilayer switch 1

Switch

Multilayer switch 2

VRRP

SWU SWU

MSTP

Domain

CPU CPU CPU CPU


Backbone configuration options

The site must be connected to the backbone with a minimum of two links to provide redundancyDynamic routing protocol is used between the site routers and the backboneCommonly used L1/L2 interfaces towards the backbone are shown

Core site

NokiaRNC

NokiaGGSN

Nokia3G

SGSN

NokiaMSC

ServerNokiaHLR

NokiaMGW

Core site

NokiaRNC

Nokia3G

SGSN

NokiaMGW

NokiaSGSN

NokiaGGSN

Ethernet

ATM backbone

Packet over SDH

PPP/TDM

Frame Relay/TDM

03_LAN+_Connectivity_in_NSN_SGSN_SG7_CN3122EN70GLN00_ppt

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