1 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Overview of RSVP-TE Network Simulator: Design and Implementation D.Adami, C.Callegari, S.Giordano, F.Mustacchio, M.Pagano, F.Vitucci Dipartimento di Ingegneria dell’Informazione: Elettronica, Informatica, Telecomunicazioni Università di Pisa

2 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Outline Motivations and Requirements a MPLS Node Simulator (MNS) based on the Constrained Routing – Label Distribution Protocol (CR-LDP) is available in NS2 but….. MPLS node implementation strict distinction between control and data plane RSVP-TE\ns module RSVP-TE enhancements for LSP handling simulator functions Functional validation test

3 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Motivations A MPLS Network Simulator (MNS) is available in the Network Simulator 2 (NS2) developed at Chungnam National University, Korea based on the Constrained Routing – Label Distribution Protocol (CR-LDP) But … –IETF RFC 3468 states: “Multiprotocol Label Switching (MPLS) Working Group within the IETF focus its efforts on “Resource Reservation Protocol (RSVP)-TE: Extensions to RSVP for Label-Switched Paths (LSP) Tunnels” (RFC 3209) as the MPLS signalling protocol for traffic engineering applications and undertake no new efforts relating to “Constraint-Based LSP Setup using Label Distribution Protocol (LDP)” (RFC 3212)”. –CCAMP Working Group survey A survey of GMPLS implementations was published in June It includes responses from 22 different implementers. Twenty-one of 22 implementations include the GMPLS signalling based on RSVP-TE while only 3 include signalling based on CR-LDP.

4 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Motivations RSVP-TE Network Simulator will be useful to assess the feasibility of innovative mechanisms in different network scenarios: –MPLS networks (MPLS Working Group) Encoding of Attributes for Multiprotocol Label Switching (MPLS) Label Switched Path (LSP) Establishment Using RSVP-TE Extensions to RSVP-TE for Point to Multipoint TE LSPs –DiffServ-aware MPLS networks (MPLS Working Group) RFC 3568 defines the concept of Classtype but no RSVP-TE enhancements have been standardized yet to support such an information –GMPLS networks (CCAMP Working Group) RSVP-TE Extensions in support of End-to-End Generalized Multi-Protocol Label Switching (GMPLS)-based Recovery

5 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Requirements Overall design requirements –Standard compliance: with respect to IETF Standardization documents (e.g RSVP-TE RFC 3209) –Extensibility: enhancements in the signalling protocol and in the control plane mechanisms should be easily introduced in the simulator –Modularity: it should be possible to combine different modules implementing distinct functionalities (e.g. use of different scheduling algorithms) –Open source code: Network Simulator version 2

6 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 MPLS node implementation To develop a full comprehensive simulation environment for MPLS networks the following functionalities are required: –Data plane mechanisms (label swapping, traffic mapping, etc.) –Control plane mechanisms (MPLS signalling protocol: RSVP-TE o CR- LDP) Source Destination Label Switched Path (LSP) 1 Label Switched Path (LSP) 2

7 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 MPLS node implementation in the NS2 simulator

8 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 MPLS node implementation: control plane

9 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 MPLS node implementation: data plane

10 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 RSVP-TE\ns module RSVP-TE object added or modified in the PATH message: SESSION LABEL_REQUEST SENDER_TEMPLATE SENDER_TSPEC EXPLICIT ROUTE OBJECT (ERO) RECORD ROUTE OBJECT (RRO) SESSION_ATTRIBUTE

11 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 RSVP-TE\ns module RSVP-TE object added or modified in the PATH message: SESSION LABEL_REQUEST SENDER_TEMPLATE SENDER_TSPEC EXPLICIT ROUTE OBJECT (ERO) RECORD ROUTE OBJECT (RRO) SESSION_ATTRIBUTE

12 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 RSVP-TE\ns module RSVP-TE object added or modified in the RESV message: SESSION FLOW_SPEC FILTER_SPEC STYLE LABEL RECORD ROUTE OBJECT (RRO)

13 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Simulator functions LSP establishment –Commands: create-erlsp-rsvpte create-erbwlsp-rsvpte –Action: a PATH message is sent by the Ingress Label Edge Router (LER) towards the Egress LER –An explicit route could be specified by means of the ERO Object After the Egress LER receives the PATH message, a RESV message is sent upstream The RESV message is processed by each Label Switched Router (LSR) along the path, which, in turn, performs label allocation and optionally resource reservation

14 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Simulator functions Mapping traffic flows to a LSP: –Command: bind-flow-LSP –Action: Traffic flow is mapped onto the LSP LSP release: –Command: release-LSP –Action: a PATH_ERR message is sent by the Ingress Label Edge Router (LER) towards the Egress LER labels and resources are released along the PATH

15 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Simulator functions Failure handling –Command: break-link –Action: a PATH_ERR message is sent by the LSR (Upstream node) towards the Ingress LER for each LSP In turn, the Ingress LER sends a PATH_TEAR message to release resources a RESV_ERR message is sent by the LSR (Upstream node) towards the Egress LER for each LSP In turn, the Egress LER sends the corresponding RESV_TEAR message to release resources

16 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Functional validation test Objective –to assess LSP establishment, flow mapping and failure handling in the RSVP-TE Network Simulator

17 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Functional validation test Objective –to assess LSP establishment, resource allocation, traffic engineering mechanisms and flow mapping in the RSVP-TE Network Simulator

18 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Functional validation test (NAM animation)

19 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Conclusions A full comprehensive MPLS network simulation environment based on the RSVP-TE signalling protocol has been developed Thank to its modularity and extensibility this simulation environment could be useful to speed-up the design, development and deployment of enhanced (G)MPLS networks The software is available on the TlcNetGroup software repository at the site: wwwtlc.iet.unipi.it

20 Fabio Mustacchio - IPS-MOME 2005 – Warsaw, March 15th 2005 Questions? Thank you