Multi-Protocol Label Switching
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Control Plane Overview Subnet 1.2 Subnet 1.2
The Network Layer: Control Plane Overview Subnet 1.2 Subnet 1.2 R3 R2 R6 Interior Subnet 1.2 R5 Subnet 1.2 Subnet 1.2 R7 1. Routing Algorithms: Link-State, Distance Vector R8 R4 R1 Subnet 1.2 Dijkstra’s algorithm, Bellman-Ford Algorithm Exterior Subnet 1.2 Subnet 1.2 2. Routing Protocols: OSPF, BGP Raj Jain 3. SDN Control Plane Washington University in Saint Louis 4. ICMP Saint Louis, MO 63130 5. SNMP [email protected] Audio/Video recordings of this lecture are available on-line at: Note: This class lecture is based on Chapter 5 of the textbook (Kurose and Ross) and the figures provided by the authors. http://www.cse.wustl.edu/~jain/cse473-16/ Washington University in St. Louis http://www.cse.wustl.edu/~jain/cse473-16/ ©2016 Raj Jain Washington University in St. Louis http://www.cse.wustl.edu/~jain/cse473-16/ ©2016 Raj Jain 5-1 5-2 Network Layer Functions Overview Routing Algorithms T Forwarding: Deciding what to do with a packet using 1. Graph abstraction a routing table Data plane 2. Distance Vector vs. Link State T Routing: Making the routing table Control Plane 3. Dijkstra’s Algorithm 4. Bellman-Ford Algorithm Washington University in St. Louis http://www.cse.wustl.edu/~jain/cse473-16/ ©2016 Raj Jain Washington University in St. Louis http://www.cse.wustl.edu/~jain/cse473-16/ ©2016 Raj Jain 5-3 5-4 Rooting or Routing Routeing or Routing T Rooting is what fans do at football games, what pigs T Routeing: British do for truffles under oak trees in the Vaucluse, and T Routing: American what nursery workers intent on propagation do to T Since Oxford English Dictionary is much heavier than cuttings from plants. -
X.25: ITU-T Protocol for WAN Communications
X.25: ITU-T Protocol for WAN Communications X.25, an ITU-T protocol for WAN communications, is a packet switched data network protocol which defines the exchange of data as well as control information between a user device, called Data Terminal Equipment (DTE) and a network node, called Data Circuit Terminating Equipment (DCE). X.25 is designed to operate effectively regardless of the type of systems connected to the network. X.25 is typically used in the packet-switched networks (PSNs) of common carriers, such as the telephone companies. Subscribers are charged based on their use of the network. X.25 utilizes a Connection-Oriented service which insures that packets are transmitted in order. X.25 sessions are established when one DTE device contacts another to request a communication session. The DTE device that receives the request can either accept or refuse the connection. If the request is accepted, the two systems begin full-duplex information transfer. Either DTE device can terminate the connection. After the session is terminated, any further communication requires the establishment of a new session. X.25 uses virtual circuits for packets communications. Both switched and permanent virtual circuits are used. X.75 is the signaling protocol for X.25, which defines the signaling system between two PDNs. X.75 is essentially an Network to Network Interface (NNI). X.25 protocol suite comes with three levels based on the first three layers of the OSI seven layers architecture. The Physical Level: describes the interface with the physical environment. There are three protocols in this group: 1) X.21 interface operates over eight interchange circuits; 2) X.21bis defines the analogue interface to allow access to the digital circuit switched network using an analogue circuit; 3) V.24 provides procedures which enable the DTE to operate over a leased analogue circuit connecting it to a packet switching node or concentrator. -
Virtual-Circuit Networks: Frame Relay Andatm
CHAPTER 18 Virtual-Circuit Networks: Frame Relay andATM In Chapter 8, we discussed switching techniques. We said that there are three types of switching: circuit switching, packet switching, and message switching. We also men tioned that packet switching can use two approaches: the virtual-circuit approach and the datagram approach. In this chapter, we show how the virtual-circuit approach can be used in wide-area networks. Two common WAN technologies use virtual-circuit switching. Frame Relay is a relatively high-speed protocol that can provide some services not available in other WAN technologies such as DSL, cable TV, and T lines. ATM, as a high-speed protocol, can be the superhighway of communication when it deploys physical layer carriers such as SONET. We first discuss Frame Relay. We then discuss ATM in greater detaiL Finally, we show how ATM technology, which was originally designed as a WAN technology, can also be used in LAN technology, ATM LANs. 18.1 FRAME RELAY Frame Relay is a virtual-circuit wide-area network that was designed in response to demands for a new type ofWAN in the late 1980s and early 1990s. 1. Prior to Frame Relay, some organizations were using a virtual-circuit switching network called X.25 that performed switching at the network layer. For example, the Internet, which needs wide-area networks to carry its packets from one place to another, used X.25. And X.25 is still being used by the Internet, but it is being replaced by other WANs. However, X.25 has several drawbacks: a. -
The Network Layer: Control Plane
CHAPTER 5 The Network Layer: Control Plane In this chapter, we’ll complete our journey through the network layer by covering the control-plane component of the network layer—the network-wide logic that con- trols not only how a datagram is forwarded among routers along an end-to-end path from the source host to the destination host, but also how network-layer components and services are configured and managed. In Section 5.2, we’ll cover traditional routing algorithms for computing least cost paths in a graph; these algorithms are the basis for two widely deployed Internet routing protocols: OSPF and BGP, that we’ll cover in Sections 5.3 and 5.4, respectively. As we’ll see, OSPF is a routing protocol that operates within a single ISP’s network. BGP is a routing protocol that serves to interconnect all of the networks in the Internet; BGP is thus often referred to as the “glue” that holds the Internet together. Traditionally, control-plane routing protocols have been implemented together with data-plane forwarding functions, monolithi- cally, within a router. As we learned in the introduction to Chapter 4, software- defined networking (SDN) makes a clear separation between the data and control planes, implementing control-plane functions in a separate “controller” service that is distinct, and remote, from the forwarding components of the routers it controls. We’ll cover SDN controllers in Section 5.5. In Sections 5.6 and 5.7 we’ll cover some of the nuts and bolts of managing an IP network: ICMP (the Internet Control Message Protocol) and SNMP (the Simple Network Management Protocol). -
IS-IS Client for BFD C-Bit Support
IS-IS Client for BFD C-Bit Support The Bidirectional Forwarding Detection (BFD) protocol provides short-duration detection of failures in the path between adjacent forwarding engines while maintaining low networking overheads. The BFD IS-IS Client Support feature enables Intermediate System-to-Intermediate System (IS-IS) to use Bidirectional Forwarding Detection (BFD) support, which improves IS-IS convergence as BFD detection and failure times are faster than IS-IS convergence times in most network topologies. The IS-IS Client for BFD C-Bit Support feature enables the network to identify whether a BFD session failure is genuine or is the result of a control plane failure due to a router restart. When planning a router restart, you should configure this feature on all neighboring routers. • Finding Feature Information, on page 1 • Prerequisites for IS-IS Client for BFD C-Bit Support, on page 1 • Information About IS-IS Client for BFD C-Bit Support, on page 2 • How to Configure IS-IS Client for BFD C-Bit Support, on page 2 • Configuration Examples for IS-IS Client for BFD C-Bit Support, on page 3 • Additional References, on page 4 • Feature Information for IS-IS Client for BFD C-Bit Support, on page 4 Finding Feature Information Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table. -
Comparative Analysis of Mpls and Non-Mpls Network
Madhulika Bhandure, Gaurang Deshmukh, Prof. Varshapriya J N / International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 3, Issue 4, Jul-Aug 2013, pp. 71-76 Comparative Analysis of Mpls and Non -Mpls Network Madhulika Bhandure1, Gaurang Deshmukh2, Prof. Varshapriya J N3 1, 2, 3(Department of Computer Science and IT, VJTI, Mumbai-19 ABSTRACT A new standard for a new world of from on complex over to the next. Originally networking, MPLS is a forwarding mechanism MPLS created by a crew of engineers that were based on Tag Switching. MPLS is an innovative consumed with improving the quickness of routers approach in which forwarding decision is taken nevertheless from the time it has emerged as a based on labels. Label is created for every route classic in today's telecommunications. There have in routing table. Large operators have embraced been a multitude number of attempts at developing multiprotocol label switching, deploying it in many technologies with the identical goals, to date their backbone networks to enable a number of none have reached the position of success that we services and applications such as virtual private now see with MPLS. To this extent what benefits networks to just name one. This paper presents arise out of using MPLS you may wonder? Well an overview of the MPLS technology and firstly, they allow internet service providers the related IETF standards, and how it is faster and savvy to maintain rapidly growing internet. In better than traditional IP routing. addition allows for fundamental adjustability. Appreciating MPLS means looking to some of the Keywords - LDP, LSP, LSR, MPLS, QoS parts that exist concerning to the MPLS such as the label which is a locally significant identifier that is I. -
A Detail Review on Multiprotocol Label Switching (MPLS)
International Journal of Engineering Research and General Science Volume 3, Issue 2, March-April, 2015 ISSN 2091-2730 A Detail Review on Multiprotocol Label Switching (MPLS) Divya Sharma, Renu Singla M-Tech. Student Asst. Prof. Department Of Computer Science Department Of Computer Science Shri Ram College of Engineering and Management, Shri Ram College of Engineering and Management, Palwal, Haryana, India Palwal, Haryana, India Abstract— Multiprotocol level switching is rapidly emerging technology which plays a main role in new generation network by improvising QoS scalability speed and other features like traffic engineering. MPLS provide a framework that efficient for routing, switching and forwarding. MPLS allow for creating end-to-end circuits by using any transport protocol. The main goal of MPLS is to eliminate the dependency of OSI model data link layered technology i.e. frame relay, Ethernet, asynchronous transfer mode. This paper provides a detail overview on MPLS with its terminologies, functioning and the services that it offers Keywords— MPLS, VPN, LSR, LDP, LER, LSP, FEC. I. INTRODUCTION IP based networks typically provide minimum QOS features available in circuit switch network such as ATM and frame relay. MPLS brings the mundanely of a connection oriented protocol to the connectionless IP protocols [2]. MPLS is an Internet Engineering Task Force (IETF) specified framework that offers efficient routing, switching and traffic forwarding. It is a technology for delivering IP based services. It provides the ability to offer highly advance IP services and highly scalability features with easy configuration and management for both customers and service providers. In a conventional IP networks each router performs an IP lookup determines the next hop based on its routing tables and forewords the packet to the nearby neighbors due to this creating lot of load at each router interface [3]. -
Multiprotocol Label Switching
CHAPTER23 MULTIPROTOCOL LABEL SWITCHING 23.1 The Role of Mpls 23.2 Background Connection-Oriented QoS Support Traffic Engineering Virtual Private Network (VPN) Support Multiprotocol Support 23.3 MPLS Operation 23.4 Labels Label Stacking Label Format Label Placement 23.5 FECs, LSPs, and Labels Route Selection 23.6 Label Distribution Requirements for Label Distribution Label Distribution Protocol LDP Messages LDP Message Format 23.7 Traffic Engineering Elements of MPLS Traffic Engineering Constrained Shortest-Path First Algorithm RSVP-TE 23.8 Virtual Private Networks Layer 2 Virtual Private Network Layer 3 Virtual Private Network 23.9 Recommended Reading 23.10 Key Terms, Review Questions, and Problems 749 750 CHAPTER 23 / MULTIPROTOCOL LABEL SWITCHING LEARNING OBJECTIVES After studying this chapter, you should be able to: ◆ Discuss the role of MPLS in an Internet traffic management strategy. ◆ Explain at a top level how MPLS operates. ◆ Understand the use of labels in MPLS. ◆ Present an overview of how the function of label distribution works. ◆ Present an overview of MPLS traffic engineering. ◆ Understand the difference between layer 2 and layer 3 VPNs. In Chapter 19, we examined a number of IP-based mechanisms designed to improve the performance of IP-based networks and to provide different levels of quality of service (QoS) to different service users. Although the routing protocols discussed in Chapter 19 have as their fundamental purpose dynami- cally finding a route through an internet between any source and any destina- tion, they also provide support for performance goals in two ways: 1. Because these protocols are distributed and dynamic, they can react to congestion by altering routes to avoid pockets of heavy traffic. -
Networking CS 3470, Section 1 Forwarding
Chapter 3 Part 3 Switching and Bridging Networking CS 3470, Section 1 Forwarding A switching device’s primary job is to receive incoming packets on one of its links and to transmit them on some other link This function is referred as switching and forwarding According to OSI architecture this is the main function of the network layer Forwarding How does the switch decide which output port to place each packet on? It looks at the header of the packet for an identifier that it uses to make the decision Two common approaches Datagram or Connectionless approach Virtual circuit or Connection-oriented approach Forwarding Assumptions Each host has a globally unique address There is some way to identify the input and output ports of each switch We can use numbers We can use names Datagram / Connectionless Approach Key Idea Every packet contains enough information to enable any switch to decide how to get it to destination Every packet contains the complete destination address Datagram / Connectionless Approach An example network To decide how to forward a packet, a switch consults a forwarding table (sometimes called a routing table) Copyright © 2010, Elsevier Inc. All rights Reserved Datagram / Connectionless Approach Destination Port ----------------------------------- A 3 B 0 C 3 D 3 E 2 F 1 G 0 H 0 Forwarding Table for Switch 2 Copyright © 2010, Elsevier Inc. All rights Reserved Datagram Networks: The Internet Model No call setup at network layer Routers: no state about end-to-end connections no network-level concept of “connection” Packets forwarded using destination host address packets between same source-dest pair may take different paths session session transport transport network network 1. -
Future of Asynchronous Transfer Mode Networking
California State University, San Bernardino CSUSB ScholarWorks Theses Digitization Project John M. Pfau Library 2004 Future of asynchronous transfer mode networking Fakhreddine Mohamed Hachfi Follow this and additional works at: https://scholarworks.lib.csusb.edu/etd-project Part of the Digital Communications and Networking Commons Recommended Citation Hachfi, akhrF eddine Mohamed, "Future of asynchronous transfer mode networking" (2004). Theses Digitization Project. 2639. https://scholarworks.lib.csusb.edu/etd-project/2639 This Thesis is brought to you for free and open access by the John M. Pfau Library at CSUSB ScholarWorks. It has been accepted for inclusion in Theses Digitization Project by an authorized administrator of CSUSB ScholarWorks. For more information, please contact [email protected]. FUTURE OF ASYNCHRONOUS TRANSFER MODE NETWORKING A Thesis Presented to the Faculty of California State University, San Bernardino In Partial Fulfillment of the Requirements for the Degree Master of Business Administration by ' Fakhreddine Mohamed Hachfi June 2004 FUTURE OF ASYNCHRONOUS TRANSFER MODE NETWORKING A Thesis Presented to the Faculty of California State University, San Bernardino by Fakhreddine Mohamed Hachfi June 2004 Approved by: Da^e Frank Lin, Ph.D., Inf ormatTdn—&^-DSsision Sciences „ / Walt Stewart, Jr., Ph.D., Department Chair Information & Decision Sciences © 2004 Fakhreddine Mohamed Hachfi ABSTRACT The growth of Asynchronous Transfer Mode ATM was considered to be the ideal carrier of the high bandwidth applications like video on demand and multimedia e-learning. ATM emerged commercially in the beginning of the 1990's. It was designed to provide a different quality of service at a speed up to 10 Gbps for both real time and non real time application. -
Efficient Network Reachability Analysis Using a Succinct Control Plane Representation
Efficient Network Reachability Analysis using a Succinct Control Plane Representation Seyed K. Fayaz Tushar Sharma Ari Fogel∗ Ratul Mahajany Todd Millsteinz Vyas Sekar George Varghesez CMU ∗Intentionet yMicrosoft Research zUCLA Abstract— To guarantee network availability and se- curity, operators must ensure that their reachability poli- cies (e.g., A can or cannot talk to B) are correctly im- plemented. This is a difficult task due to the complexity Routers Environment at )me t configura)on files of network configuration and the constant churn in a net- Network work’s environment, e.g., new route announcements ar- Environment at )me t+1 control plane rive and links fail. Current network reachability analysis Environment at )me t+2 … … techniques are limited as they can only reason about the data plane at )me t+2 current “incarnation” of the network, cannot analyze all data plane at )me t+1 configuration features, or are too slow to enable explo- data plane at )me t ration of many environments. We build ERA, a tool for A B efficient reasoning about network reachability. Instead of Figure 1: Reachability behavior of a network (e.g., A reasoning about individual incarnations of the network, can talk to B) is determined by its data plane, which, ERA directly reasons about the network “control plane” in turn, is the current incarnation of the control plane. that generates these incarnations. We address key expres- siveness and scalability challenges by building (i) a suc- To highlight this challenge, it is useful to consider prior cinct model for the network control plane (i.e., various work on network verification. -
Chapter 10: Circuit Switching and Packet Switching Switching Networks
Chapter 10: Circuit Switching and Packet Switching CS420/520 Axel Krings Page 1 Sequence 10 Switching Networks • Long distance transmission is typically done over a network of switched nodes • Nodes not concerned with content of data • End devices are stations — Computer, terminal, phone, etc. • A collection of nodes and connections is a communications network • Data is routed by being switched from node to node CS420/520 Axel Krings Page 2 Sequence 10 1 Nodes • Nodes may connect to other nodes only, or to stations and other nodes • Node to node links usually multiplexed • Network is usually partially connected — Some redundant connections are desirable for reliability • Two different switching technologies — Circuit switching — Packet switching CS420/520 Axel Krings Page 3 Sequence 10 Simple Switched Network CS420/520 Axel Krings Page 4 Sequence 10 2 Circuit Switching • Dedicated communication path between two stations • Three phases — Establish — Transfer — Disconnect • Must have switching capacity and channel capacity to establish connection • Must have intelligence to work out routing CS420/520 Axel Krings Page 5 Sequence 10 Circuit Switching • Inefficient — Channel capacity dedicated for duration of connection — If no data, capacity wasted • Set up (connection) takes time • Once connected, transfer is transparent • Developed for voice traffic (phone) CS420/520 Axel Krings Page 6 Sequence 10 3 Public Circuit Switched Network CS420/520 Axel Krings Page 7 Sequence 10 Telecom Components • Subscriber — Devices attached to network • Subscriber