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Broadband Connectivity Services (BBCS) An Engineering Perspective

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Presentation on theme: "Broadband Connectivity Services (BBCS) An Engineering Perspective"— Presentation transcript:

1 Broadband Connectivity Services (BBCS) An Engineering Perspective
Rasti Slosiar, Swisscom-Fixnet AG Head of IP Service Integration

2 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

3 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

4 BBCS - Service Overview

5 BBCS - Service Overview Speeds & Customer relationships
Today: 64 kbps up 256 kbps down 128 kbps up, 512 kbps down Tomorrow ( pilot phase 1.5 months) 256 kbps up, Mbps down 352 kbps up, Mbps down ISP owns end-customer: ISP sales channel ISP to provide starter kit ISP to provide customer care Swisscom owns ISP customer (wholesale model)

6 BBCS - Service Overview User Perspective based on PPP Service Selection
ISP X AAA (optional) Corporation Layer 2 Service Selection involves using a PPP client. This client can be integrated into the Microsoft dial-up networking client so that it appears as a familiar application to dial-up networking users. The user types in a and a password and hits OK. This initiates the PPP session from the client which is examined at Network Access Server. The servicename is used to index into a profile which contains the information about what to do with the PPP session. Options may include forwarding the PPP session via a L2F or L2TP tunnel, or terminating the PPP session and using proxy Radius authentication for the user. If the user is successfully authenticated, the destination network assigns an IP address for that user. When the user wants to select another service, the PPP session must be torn down and re-initiated to the new destination. In some service provider architectures it is not desirable to tear down the session before selecting another. Tunnel PPP Client ISP Y SSG Extranet Cisco 6400 PPP

7 BBCS - Service Overview ISP Perspective - L2TP Tunnel Selection
L2TP tunnel is built based on structured username, PPP session is multiplexed into L2TP tunnel towards LNS ISP-A.ch ISP-B.ch IPSS LNS ISP-A.ch LNS LAC L2TP tunnel PPP session

8 BBCS - Service Overview ISP Perspective - Session Balancing (Rel
BBCS - Service Overview ISP Perspective - Session Balancing (Rel. 3 Basic) Max 1 domain Max 8 LNSes 1 set of rules nationwide (I)SP A Area LU ZH LNS 1 LAC - LU Prio 1 „oneDomain.ch“ Area ZH LNS 2 STE1 Prio 1 „oneDomain.ch“ Area TI session balancing POP - ZH IP - Network POP - BE (I)SP A BE LNS 3 Prio 1 „oneDomain.ch“ Area GE LNS 4 Area BE STE2 Prio 1 „oneDomain.ch“ End-Customer to backbone route LNS 5 Backbone to ISP session balancing Prio 1 „oneDomain.ch“

9 BBCS - Service Overview ISP Perspective - Session Balancing (Rel
BBCS - Service Overview ISP Perspective - Session Balancing (Rel. 3 Premium) Max 3 domains Max 2 priorities/domain Max 8 LNS/domain 1 set of rules nationwide (I)SP A Area LU ZH LNS 1 LAC - LU Prio 1 „cheap.ch“ Area ZH 20 MBit LNS 2 STE1 Prio 1 „cheap.ch“ Prio 2 „expensive.ch“ Area TI session balancing POP - ZH IP - Network POP - BE 100 MBit (I)SP A BE LNS 3 Primary route Prio 1 „expensive.ch“ Area GE Secondary route LNS 4 Area BE STE2 Prio 1 „expensive.ch“ End-Customer to backbone route LNS 5 Backbone to ISP session balancing Prio 1 „expensive.ch“

10 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

11 Solution Architecture Topology Overview
Layer 3 solution! (no E2E ATM PVCs)

12 Solution Architecture Cisco 6400
Node switch processor (NSP) 5 Gbps ATM switch and system processor 32K VCCs Node route processor (NRP) 7200 NPE-200 class router 155 Mbps backplane connector NRP2 Dual 7200 NPE-300 class router 622 Mbps backplane connector Node line card (NLC) STM-1, DS-3, and STM-4 ATM NSP A PEM A PEM B Air Exhaust (Rear) Air Intake (Front) NSP B NLC NRP

13 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

14 Protocol Stack Layered End-to-End Connectivity

15 Protocol Stack Traffic Carried
Swisscom-Fixnet carries: PPPoX traffic in the access L2TP Traffic in the edge and core Swisscom-Fixnet IP Connectivity for BBCS: No IP connectivity in Access (PPPoX frames bridged in modem), only “PPPoE” connectivity to select domain IP Connectivity between LAC NRP Loopbacks and LNS Loopbacks from each ISP (L2TP tunnel endpoints) Used to establish L2TP tunnel, no other visibility PC to ISP connectivity via IP within PPP

16 Protocol Stack PPP Negotiation and Tunnel Establishment
LAC LNS

17 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

18 IPSS - Swisscom’s MPLS/VPN Network Network Areas
Core Edge Access Core Node Edge Node Access Node CPE After having explained the VPN principle, we are going to look a bit more into the network implementation. IPSS distinguishes 3 areas. The core area, the edge area and the access area. Each area has its own node types. Out of the access area is the customer premises with the CPE, the customer premises equipment. Now we are going to characterise the three areas.

19 IPSS - Swisscom’s MPLS/VPN Network Facts
Cisco based edge and core Edge implements Multiprotocol BGP (VPN “Intelligence”) Alcatel based DSLAM Some numbers: 35 edge and core locations Currently STM Gbit/s core trunks 900 DSLAMs Services supported by IPSS BBCS LAN Interconnect Corporate Network etc.

20 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

21 VPN Design Route colouring for Hub-and-Spoke VPN Connectivity

22 Agenda BBCS - Service Overview Solution Architecture Protocol Stack
IPSS - Swisscom’s MPLS/VPN Network VPN Architecture for BBCS Samples

23 Samples Routing Table at Hub CE (NRP)
ipc-zhb790-r-lc-01>show ip route ... Gateway of last resort is not set /16 is variably subnetted, x subnets, 2 masks B /32 [20/0] via , 14:32:34 B /32 [20/0] via , 14:32:34 B /32 [20/0] via , 14:32:34 B /32 [20/0] via , 14:32:34 B /32 [20/0] via , 14:32:34 B /32 [20/0] via , 14:33:02 B /32 [20/0] via , 14:33:02 … /32 is subnetted, 2 subnets B [20/0] via , 14:35:44 B [20/0] via , 14:35:44 /32 is subnetted, 1 subnets B [20/0] via , 14:35:44 /32 is subnetted, 1 subnets B [20/0] via , 14:35:44 /32 is subnetted, 1 subnets B [20/0] via , 14:35:44 /32 is subnetted, 1 subnets B [20/0] via , 14:35:44 NRPs (Hubs) LNS Loopbacks (Spokes)

24 Samples Routing Table at Spoke CE (connects to ISP LNS)
ip-efg-ch-abc-r-01>show ip route ... Gateway of last resort is not set /30 is subnetted, 1 subnets C is directly connected, FastEthernet1/0 /16 is variably subnetted, x subnets, 2 masks B /32 [20/0] via , 14:47:49 B /32 [20/0] via , 14:53:38 B /32 [20/0] via , 14:53:39 B /32 [20/0] via , 15:12:11 B /32 [20/0] via , 15:03:07 B /32 [20/0] via , 14:41:52 B /32 [20/0] via , 14:41:52 … /32 is subnetted, 1 subnets S [1/0] via Interface to LNS NRPs (Hubs) ONLY ROUTES! Static Route to LNS

25

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