NetworkRoutingI

NetworkRoutingI - SwitchingandForwarding...

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Csci 232: Computer Networks      Forwarding and Routing   Network Layer Part I 1 Switching and Forwarding Network Layer Part I Switching and Forwarding Generic Router Architecture Forwarding Tables: Bridges/Layer 2 Switches; VLAN Routers and Layer 3 Switches  Forwarding in Layer 3 (Network Layer)  Network Layer Functions  Network Service Models: VC vs. Datagram ATM and IP Datagram Forwarding IP Addressing Network vs. host: address blocks, longest prefix matching Address allocation and DHCP IP Datagram Forwarding Model and ARP Protocol IP and ICMP Protocols, IP Fragmentation and Re-assembly Readings: Te xtb o o k: C ha pte r 4: S e c tio n 4.1;  
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C s c i 232: C o m pute r Ne two rks      Fo rwa rding  a nd Ro uting   Ne two rk La ye r P a rt I 2 Logical View of a Router A E D C B F 2 2 1 3 1 1 2 5 3 5
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C s c i 232: C o m pute r Ne two rks      Fo rwa rding  a nd Ro uting   Ne two rk La ye r P a rt I 3 IP Addressing: Basics Globally unique (for “public” IP addresses) IP address:  32-bit identifier for host, router interface  Interface:  connection between host/router and physical link router’s typically have multiple interfaces host may have multiple interfaces IP addresses associated with each interface Dot notation (for ease of human reading) 223.1.1.1 = 11011111 00000001 00000001 00000001 223 1 1 1
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Csci 232: Computer Networks      Forwarding and Routing   Network Layer Part I 4 IP Addressing: Network vs. Host Two-level hierarchy   network part (high order bits) host part (low order bits)   What’s a network ?  ( from IP address perspective) device interfaces with same  network part of IP address can physically reach each other  without intervening router 223.1.1.1 223.1.1.3 223.1.1.4 223.1.2.2 223.1.2.1 223.1.2.6 223.1.3.2 223.1.3.1 223.1.3.27 223.1.1.2 223.1.7.0 223.1.7.1 223.1.8.0 223.1.8.1 223.1.9.1 223.1.9.2 multi-access LAN point-to-point  link
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Csci 232: Computer Networks      Forwarding and Routing   Network Layer Part I 5 “Classful” IP Addressing 32 bits 0 network host 10 network host 110 network host 1110 multicast address A B C D class 1.0.0.0 to 127.255.255.255 128.0.0.0 to 191.255.255.255 192.0.0.0 to 223.255.255.255 224.0.0.0 to 239.255.255.255 7 15 23 31 Disadvantage: inefficient use of address space; address space exhaustion  e.g., class B net allocated enough addresses for 65K hosts, even if only 2K  hosts in that network
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Csci 232: Computer Networks      Forwarding and Routing   Network Layer Part I 6 Classless Addressing: CIDR  CIDR:   C lassless  I nter D omain  R outing Network portion of address is of 
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NetworkRoutingI - SwitchingandForwarding...

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