Title page for ETD etd-11202001-110531

Type of Document Master's Thesis
Author Raghavan, Srihari
Author's Email Address sriharirag@yahoo.com
URN etd-11202001-110531
Title An MPLS-based Quality of Service Architecture for Heterogeneous Networks
Degree Master of Science
Department Computer Science
Advisory Committee
Advisor Name Title
Midkiff, Scott F. Committee Co-Chair
Varadarajan, Srinidhi Committee Co-Chair
Henry, Sallie M. Committee Member
  • MPLS
  • CR-LDP
  • QoS
  • TCP
  • NS-2
Date of Defense 2001-11-12
Availability unrestricted
This thesis proposes a multi-protocol label switching (MPLS)-based architecture to

provide quality of service (QoS) for both internet service provider (ISP) networks and

backbone Internet Protocol (IP) networks that are heterogeneous in nature.

Heterogeneous networks are present due to the use of different link-layer mechanisms in

the current Internet. Copper-based links, fiber-based links, and wireless links are some

examples of different physical media that lead to different link-layer mechanisms. The

proposed architecture uses generalized MPLS and other MPLS features to combat

heterogeneity. The proposed architecture leverages the QoS capabilities of asynchronous

transfer mode (ATM) and the scalability advantages of the IP differentiated services

(DiffServ) architecture. This architecture is constructed in such a way that MPLS

interacts with DiffServ in the backbone networks while performing ATM-like QoS

enforcement in the periphery of the networks. The architecture supports traffic

engineering through MPLS explicit paths. MPLS network management, bandwidth

broker capabilities, and customizability is handled through domain specific MPLS

management entities that use the Common Open Policy Service (COPS) protocol to

interact with other MPLS entities like MPLS label switch routers and label edge routers.

The thesis provides a description of MPLS and QoS, followed by a discussion of the

motivation for a new architecture. The MPLS-based architecture is then discussed and

compared against similar architectures. To integrate the ATM and DiffServ QoS

attributes into this architecture, MPLS signaling protocols are used. There are two

common MPLS signaling protocols. They are Resource Reservation Protocol with traffic

engineering extensions (RSVP-TE) and Constraint-Routed Label Distribution Protocol

(CR-LDP). Both these protocols offer comparative MPLS features for constraint routed

label switch path construction, maintenance, and termination. RSVP-TE uses UDP and

IP, while CR-LDP uses TCP. This architecture proposes a multi-level domain of

operation where CR-LDP operates in internet service provider (ISP) networks and RSVP-

TE operates in backbone networks along with DiffServ. Qualitative analysis for this

choice of domain of operation of the signaling protocols is then presented. Quantitative

analysis through simulation demonstrates the advantages of combining DiffServ and

MPLS in the backbone. The simulation setup compares the network performance in

handling mixed ill-behaved and well-behaved traffic in the same link, with different

levels of DiffServ and MPLS integration in the network. The simulation results

demonstrate the advantages of integrating the QoS features of DiffServ, ATM

functionality, and MPLS into a single architecture.

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