lect24 - 1.264 Lecture 24 IP networks Future...

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Unformatted text preview: 1.264 Lecture 24 IP networks Future telecommunications trends Course summary Internet routing Within a domain (company, university, etc.), interior gateway protocols are used Routing information protocol (RIP): simplest, ok for small networks: single path, max 15 hops Open shortest path first (OSPF): look at speed, quality of hops Integrated IS-IS: similar to OSPF Between domains, border gateway protocols are used: BGP Enterprise routing: IP and other protocols Router 2 Router 4 Router 3 Router 1 Frame Relay Network ISP B ISP C ISP A Internet Server Enterprise Network Model with Multiple Routes PSTN Figure by MIT OCW. Multiprotocol Label Switching (MPLS) Label edge routers (LERs) assign a label that defines the path the packet will take through the IP network Routing happens only once, at edge Another hollowing out of the network Routing at interior routers (label switched routers, or LSRs) is done in hardware, not a software lookup of IP routing tables Much faster, cheaper A stack of labels allows complex, hierarchical networks Label distribution protocol (LDP) used to distribute labels to all LSRs and LERs Uses TCP/IP MPLS allows QoS, security (strict traffic rules) MPLS VPNs operate at layer 2 or layer 3 Corporate routers dont need to support MPLS; they connect to LER via IP Multiprotocol Label Switching Figure by MIT OCW. Telecom convergence Convergence: Moving all voice, data and video traffic on the Internet...
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This note was uploaded on 12/06/2011 for the course ESD 1.264j taught by Professor Georgekocur during the Fall '06 term at MIT.

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lect24 - 1.264 Lecture 24 IP networks Future...

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