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Functional Tests of MPLS and VPN on TWAREN

Functional Tests of MPLS and VPN on TWAREN. Tsang-Ling Sheu Dept. of Electrical Engineering National Sun Yat-Sen University Kaohsiung, TAIWAN. Outline. MPLS Architectures Fast Rerouting Preemption Load sharing Auto-bandwidth Multiple MPLS-VPN. MPLS Architectures.

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Functional Tests of MPLS and VPN on TWAREN

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  1. Functional Tests of MPLS and VPN on TWAREN Tsang-Ling Sheu Dept. of Electrical Engineering National Sun Yat-Sen University Kaohsiung, TAIWAN

  2. Outline • MPLS Architectures • Fast Rerouting • Preemption • Load sharing • Auto-bandwidth • Multiple MPLS-VPN

  3. MPLS Architectures • Multiple Protocols Label Switching • Integrate IP routing and ATM Label Switching • Route once and Switch many • Establish LSP (Label Switching Path) from Ingress LSR to Egress LSR • via RSVP-TE , LDP, or CR-LDP • Provide QoS via Queuing Disciplines (or DiffServ) • WRR, DRR, Token Bucket • Provide Traffic Engineering

  4. MPLS Architectures

  5. Label Switching Path (LSP)

  6. MPLS Traffic Engineering • Bandwidth Reservation • Traffic Rerouting • Path Preemption • Path Selection • QoS-based Forwarding

  7. Traffic Engineering

  8. TWAREN Topology

  9. Notation

  10. Fast Rerouting Traffic before Link Failure

  11. Fast Rerouting (Cont.) Traffic after recovery

  12. Packet Drop Sending rate = 100 Mbps , 200 Mbps and 300 Mbps

  13. Recovery Time Sending rate = 100 Mbps , 200 Mbps and 300 Mbps

  14. Throughput Sending rate = 100 Mbps, 200 Mbps and300 Mbps

  15. Packet Drop Packet size =1000 Byte, Auto length, 64 byte. sending rate = 100 Mbps

  16. Recovery Time Packet size = 1000 Byte, Auto length, 64 byte. Sending rate = 100 Mbps

  17. Throughput Packet size = 1000 Byte, Auto length, 64 byte. Sending rate = 100 Mbps

  18. LSP Preemption Topology before Preemption

  19. LSP Preemption (Cont.) Topology after Preemption

  20. Preemption Results Packet Size = Auto Length • Recovery time from Preemption is not uniform. • It may talk less then one second or more than 20 seconds.

  21. Load Sharing

  22. Load Sharing via Hash • Cisco router uses hash function to distribute traffic over the same subnet • Three source-destination groups are tested individually. (1)   192.168.60.51 --- >  192.168.111.21 192.168.50.53 --- >  192.168.111.21 (2)   192.168.50.52 --- >  192.168.111.21 192.168.60.51 --- >  192.168.111.21 (3) 192.168.50.53 --- >  192.168.111.21 192.168.60.53 --- >  192.168.111.21 192.168.50.0/24 and 192.168.60.0/24 are on NSYSU 7609R 192.168.111.21 is on Taipei Gigapop (TP 12416R).

  23. Experimental Results • The first group uses different LSP Tunnels (192.168.60.51 to192.168.111.21:Tunnel 422 192.168.50.53 to 192.168.111.21:Tunnel 421) • The second group uses the same tunnel:Tunnel 422. • The third group uses the same tunnel: Tunnel 421. • Load sharing isworking, but because of hash function, it may need lots of source-destination pairs to be transmitted simultaneously.

  24. Auto-Bandwidth

  25. Experimental Results

  26. Multiple MPLS-VPN • VPN uses BGP backbone • Redistribute Connected • Redistribute Static • VPN uses MPLS Tunnels

  27. BGP Backbone: Redistribute Connected

  28. BGP Backbone: Redistribute Static

  29. VPN uses MPLS Tunnels

  30. Conclusions • MPLS is the selected switching technique for backbone networks (it has been widely employed in USA) • Fast Rerouting, Path Preemption, and Load Sharing are proved technologies • LSP tunneling facilitates the progress of MPLS-VPN • Bandwidth guarantee in MPLS relies on DiffServ technologies • Mapping problems still exist between 3-bit Exp field and 6-bit DSCP field

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