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Multi-operator connection issues in GRX networks

Multi-operator connection issues in GRX networks. GPRS/UMTS roaming Annikki Welin Ericsson research. Introduction. The end-to-end transport of telecom services often involves multiple carriers Mobility makes roaming and interworking important Interworking

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Multi-operator connection issues in GRX networks

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  1. Multi-operator connection issuesin GRX networks GPRS/UMTS roaming Annikki Welin Ericsson research

  2. Introduction • The end-to-end transport of telecom services often involves multiple carriers • Mobility makes roaming and interworking important • Interworking • - We have to agree and standardize common minimal set of requirements to • be able to transport end-to-end services • Resource optimization of across E-NNI (AS) boundaries • QoS guaranties across E-NNI (AS) • Fast protection along the (VPN) path

  3. Internet Home GGSN Roaming Example Root DNS Inter-PLMN GPRS Backbone SGSN Border Gateway Border Gateway SGSN Home Operator Intra-PLMN Visited Operator Intra-PLMN Visited Operator Home Operator GGSN GGSN Home DNS Visited DNS

  4. Direct connectivity between GPRS operators • IPSec • Using Internet as transport • Frame relay , ATM • Leased line as transport • VPN • Using ATM, Sonet/SDH or wavelength as transport • Requirements are • Security and QoS

  5. Connections to the GRX Network • GRX = GPRS Roaming Exchange • Several types of connections to the GRX network is available • BGP routing between carrier and GRX provider Connection to other GRX operators GRX Layer 3 BG IPSec VPN tunnel Layer 2 Carrier x Frame Relay/ATM/Ethernet/SDH Layer 1 BG Leased line BG Carrier Y Carrier Z

  6. MPLS in the GRX - L3 VPN VPN A VPN A CE CE VRF VPN B VPN B VRFs CE VRF CE • PE routers maintain multiple routing tables • one VRF per connected VPN • interface mapped to VPN • MBGP used for routing updates • MPLS LSPs used for transport P P P: Provider Router PE: Provider Edge Router CE: Customer Edge Router VRF: VPN Routing & Forwarding PE PE PE GRX Netwrok

  7. PE PE MPLS in the GRX – L2 VPN GRX network FR FR LSP ATM ATM FE/GE FE/GE PE Y PE X • Supports multi-protocol from CE site • Circuit type must be the same on ingress and egress

  8. Layer one connection Point-to-Point • Leased line • ATM. FR. IP Customer Edge GRX network • Fibre or wavelength

  9. Common requirements for all type of connections • Protection • Security • Service garantees CoS/QoS Packet loss • Policies • Signalling/VLANs • Addressing • Network management requirements • Monitoring • Alarms • Static's • Event-log • Filters

  10. VPN network management issues • Resource monitoring in VPN tunnels • How to monitor ? • tunnel head • tunnel tail • transfer entries • QoS resources • Timers (hello intervals) • Errors between boundaries • Could distribute management system be the solution?

  11. Transit VPNs E-NNI between GRX-networks ? Central Exchange point Central Exchange point GRX-to-GRX GRX OXC X Central Exchange point GRX GRX-to-GRX OXC

  12. Conclusions and questions • The problems are similar at GMPLS and VPNs with • inter-carrier / PLMN connections • Will MPLS VPNs continue through carrier boarders? • SLA at L1, L2 or L3

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