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Workshop on IP QoS and Traffic Control RSVP-TE Extensions for LSP Rerouting in NS2 D. Adami, C. Callegari, S. Giordano, M. Pagano Department of Information Engineering - University of Pisa 6-7 December 2007 IST Congress Center, Lisbon, Portugal 1 Michele Pagano Outline • Introduction • MPLS-based Recovery • RSVP-TE Reservation Styles • NS2 Software Modules • Simulations Results • Conclusions 2 Michele Pagano Introduction • Multiprotocol Label Switching (MPLS) provides: (cid:57) Traffic Engineering capabilities (cid:57) Virtual Private Networks support (cid:57) Network Survivability EEggrreessss LLSSRR ((LLaabbeell ppooppppiinngg)) TTrraannssiitt LLSSRR ((LLaabbeell sswwaappppiinngg)) IInnggrreessss LLSSRR ((LLaabbeell ppuusshhiinngg)) In In Address Out Out In In Address Out Out I/F Lab Prefix I/F Lab I/F Lab Prefix I/F Lab In In Address Out Out 3 40 172.16 1 - 3 30 172.16 1 40 I/F Lab Prefix I/F Lab ... ... ... ... ... 3 - 172.16 1 30 ... ... ... ... ... ... ... ... ... ... LLSSRR BB 40 172.16.1.2 data 172.16.0.0/16 LLSSRR AA LLSSRRCC 30 172.16.1.2 data 172.58.0.0/16 172.16.1.2 data 172.16.1.2 data 3 Michele Pagano IP Routing R8 R1 R3 R4 R2 Shortest Path LSR8 R5 R9 R7 R6 High Convergence Time! IIssssuueess (cid:57)Highly reliable services require very low recovery times (tenths of ms) (cid:57)IP routing does not assure QoS recovery 4 Michele Pagano MPLS Recovery: Path Protection Egress LER LSR1 LSR3 LSR4 LSR2 LSR8 LSR5 Ingress LER LSR7 LSR6 Working LSP MPLS-based Recovery aims at reducing the recovery times Backup Path when a failure occurs and dynamic routing protocols are used! 5 Michele Pagano MPLS Recovery: Path Restoration Egress LER LSR1 LSR3 LSR4 LSR2 LSR8 LSR5 Ingress LER LSR7 LSR6 MMPPLLSS--bbaasseedd RReeccoovveerryy OObbjjeeccttiivveess (cid:57)Optimal use of network resources Working LSP (cid:57)Traffic protection with different granularity Backup Path (cid:57)Minimization of unprotected traffic degradation 6 Michele Pagano The Recovery Cycle Egress LSR1 Resv LER LSR3 LSR4 LSR2 PathErr PathTear LSR8 LSR5 Ingress LER LSR7 LSR6 Path RReeccoovveerryy FFaauulltt DDeetteeccttiioonn FFaauulltt HHoolldd--ooffff FFaauulltt NNoottiiffiiccaattiioonn OOppeerraattiioonn TTrraaffffiiccRReeccoovveerryy TTiimmee TTiimmee TTiimmee TTiimmee TTiimmee Start of Recovery Path Network Fault Start of Recovery Operation Traffic Impairment Detected Notification Operation Complete Recovered 7 Michele Pagano RSVP-TE Reservation Styles Distinct Reservation Shared Reservation Explicit Sender Fixed-Filter Shared-Explicit Selection (FF) style (SE) style Wildcard Sender Wildcard-Filter Selection (WF) style • A reservation style indicates whether senders in the RSVP session have distinct or shared resource reservation and whether they are selected according to an explicit list • RSVP defines three different Reservation Styles – the FF style creates a distinct reservation for each sender – the SE style allows a receiver to make a single reservation shared by a set of senders explicitly specified in the reservation message – the WF style creates a single reservation that is shared by all senders in the session 8 Michele Pagano RSVP-TE Reservation Styles: Application Scenario B C (2,100) LSP (A_B_C_F) (1,50) (1,100) 40 Mbps A F (1,100) (2,100) (1,50) Bandwidth (1,100) (1,50) 70 Mbps (5,100) D E (Metric, Bandwidth) New Path A_D_B_C_F Without SE Reservation Style, it is necessary to tear down the old LSP and to set-up a new LSP 9 Michele Pagano Motivations and targets • Since planning MPLS-based recovery strategies involves trade-offs based on several factors (cid:57) End-user applications requirements (cid:57) Network efficiency (cid:57) Complexity (cid:57) Revenues our goal was to develop a powerful and flexible simulation tool to help network designers and administrators in their work • An MPLS Network Simulator (MNS) was available for the Network Simulator 2 (NS2) (cid:57) developed at Chungnam National University, Korea (cid:57) based on the Constrained Routing – Label Distribution Protocol (CR-LDP) but…a full open-source MPLS networks simulation tool had not been realized yet!! 10 Michele Pagano

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Michele Pagano. 1. RSVP-TE Extensions for. LSP Rerouting in NS2. D. Adami, C. Callegari, S. Giordano, M. Pagano. Department of Information Engineering
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Workshop on IP QoS and Traffic Control RSVP-TE Extensions for LSP Rerouting in NS2 D. Adami, C. Callegari, S. Giordano, M. Pagano Department of Information Engineering - University of Pisa 6-7 December 2007 IST Congress Center, Lisbon, Portugal 1 Michele Pagano Outline • Introduction • MPLS-based Recovery • RSVP-TE Reservation Styles • NS2 Software Modules • Simulations Results • Conclusions 2 Michele Pagano Introduction • Multiprotocol Label Switching (MPLS) provides: (cid:57) Traffic Engineering capabilities (cid:57) Virtual Private Networks support (cid:57) Network Survivability EEggrreessss LLSSRR ((LLaabbeell ppooppppiinngg)) TTrraannssiitt LLSSRR ((LLaabbeell sswwaappppiinngg)) IInnggrreessss LLSSRR ((LLaabbeell ppuusshhiinngg)) In In Address Out Out In In Address Out Out I/F Lab Prefix I/F Lab I/F Lab Prefix I/F Lab In In Address Out Out 3 40 172.16 1 - 3 30 172.16 1 40 I/F Lab Prefix I/F Lab ... ... ... ... ... 3 - 172.16 1 30 ... ... ... ... ... ... ... ... ... ... LLSSRR BB 40 172.16.1.2 data 172.16.0.0/16 LLSSRR AA LLSSRRCC 30 172.16.1.2 data 172.58.0.0/16 172.16.1.2 data 172.16.1.2 data 3 Michele Pagano IP Routing R8 R1 R3 R4 R2 Shortest Path LSR8 R5 R9 R7 R6 High Convergence Time! IIssssuueess (cid:57)Highly reliable services require very low recovery times (tenths of ms) (cid:57)IP routing does not assure QoS recovery 4 Michele Pagano MPLS Recovery: Path Protection Egress LER LSR1 LSR3 LSR4 LSR2 LSR8 LSR5 Ingress LER LSR7 LSR6 Working LSP MPLS-based Recovery aims at reducing the recovery times Backup Path when a failure occurs and dynamic routing protocols are used! 5 Michele Pagano MPLS Recovery: Path Restoration Egress LER LSR1 LSR3 LSR4 LSR2 LSR8 LSR5 Ingress LER LSR7 LSR6 MMPPLLSS--bbaasseedd RReeccoovveerryy OObbjjeeccttiivveess (cid:57)Optimal use of network resources Working LSP (cid:57)Traffic protection with different granularity Backup Path (cid:57)Minimization of unprotected traffic degradation 6 Michele Pagano The Recovery Cycle Egress LSR1 Resv LER LSR3 LSR4 LSR2 PathErr PathTear LSR8 LSR5 Ingress LER LSR7 LSR6 Path RReeccoovveerryy FFaauulltt DDeetteeccttiioonn FFaauulltt HHoolldd--ooffff FFaauulltt NNoottiiffiiccaattiioonn OOppeerraattiioonn TTrraaffffiiccRReeccoovveerryy TTiimmee TTiimmee TTiimmee TTiimmee TTiimmee Start of Recovery Path Network Fault Start of Recovery Operation Traffic Impairment Detected Notification Operation Complete Recovered 7 Michele Pagano RSVP-TE Reservation Styles Distinct Reservation Shared Reservation Explicit Sender Fixed-Filter Shared-Explicit Selection (FF) style (SE) style Wildcard Sender Wildcard-Filter Selection (WF) style • A reservation style indicates whether senders in the RSVP session have distinct or shared resource reservation and whether they are selected according to an explicit list • RSVP defines three different Reservation Styles – the FF style creates a distinct reservation for each sender – the SE style allows a receiver to make a single reservation shared by a set of senders explicitly specified in the reservation message – the WF style creates a single reservation that is shared by all senders in the session 8 Michele Pagano RSVP-TE Reservation Styles: Application Scenario B C (2,100) LSP (A_B_C_F) (1,50) (1,100) 40 Mbps A F (1,100) (2,100) (1,50) Bandwidth (1,100) (1,50) 70 Mbps (5,100) D E (Metric, Bandwidth) New Path A_D_B_C_F Without SE Reservation Style, it is necessary to tear down the old LSP and to set-up a new LSP 9 Michele Pagano Motivations and targets • Since planning MPLS-based recovery strategies involves trade-offs based on several factors (cid:57) End-user applications requirements (cid:57) Network efficiency (cid:57) Complexity (cid:57) Revenues our goal was to develop a powerful and flexible simulation tool to help network designers and administrators in their work • An MPLS Network Simulator (MNS) was available for the Network Simulator 2 (NS2) (cid:57) developed at Chungnam National University, Korea (cid:57) based on the Constrained Routing – Label Distribution Protocol (CR-LDP) but…a full open-source MPLS networks simulation tool had not been realized yet!! 10 Michele Pagano

Description:
Michele Pagano. 1. RSVP-TE Extensions for. LSP Rerouting in NS2. D. Adami, C. Callegari, S. Giordano, M. Pagano. Department of Information Engineering
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