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Interior Gateway Routing Protocol (Igrp) Essay

1894 words - 8 pages

5. Interior Gateway Routing Protocol (IGRP)

[pic]Top 10 Graphics:
1. Routed versus Routing Protocols
2. Multiprotocol Routing
3. Representing Distance with Metrics
4. Distance Vector Concept
5. Distance Vector Network Discovery
6. Distance Vector Topology Changes
7. Interior or Exterior Routing Protocols
8. Interior IP Routing Protocols
9. IP Routing Configuration Tasks
10. IGRP Configuration Example


• Internetworking functions of the 3Network Layer include 'network addressing' and 'best path selection' for traffic.
• 'Network addressing' uses one part to identify the path used by the router and one part for ports or ...view middle of the document...

222.333.444 ]
[ E1 ][ - ][ Router B ][ ]
[ S0 ][ * ][ Router D ][ Default Gateway ]
• IP routing specifies that IP datagrams travel through internetworks one hop at a time
• At each stop, the next destination is calculated by matching the datagrams destination network address with an outgoing interface
• If no match is found, the datagram is sent to the Default router
Router 'path determination' function:
enables the router to select the most appropriate interface for forwarding a packet.
Router 'switching' function:
allows a router to accept a packet on one interface and forward it on a second interface.
Addressing ( Network & Host)
• Network Addrress - Location part used by the router
• Host Address - Specific port or device on the network
• Destination Address AND Subnet Mast = Destination Network
• During AND operation, the Host portion is removed
• Network portion of address used to make path selections
• Node portion refers to a specific device in the network
Routed vs Routing Protocols
Routed protocol
used between routers to carry user traffic (Ex. IP,IPX)
Routing protocol
used between routers to maintain tables (Ex. RIP,IGRP)
Routed protocol - Protocol that can be routed by a router. A router must be able to interpret the logical internetwork as specified by that routed protocol. Examples of routed protocols include AppleTalk, DECnet, and IP.
Routing protocol - Protocol that accomplishes routing through the implementation of a specific routing algorithm. Examples of routing protocols include IGRP, OSPF, and RIP.
RIP (Routing Information Protocol) - IGP supplied with UNIX BSD systems. The most common IGP in the Internet. RIP uses hop count as a routing metric.
IGRP (Interior Gateway Routing Protocol) - IGP developed by Cisco to address the problems associated with routing in large, heterogeneous networks.
EIGRP (Enhanced Interior Gateway Routing Protocol) - Advanced version of IGRP developed by Cisco. Provides superior convergence properties and operating efficiency, and combines the advantages of link state protocols with those of distance vector protocols.
OSPF (Open Shortest Path First) - Link-state, hierarchical IGP routing protocol proposed as a successor to RIP in the Internet community. OSPF features include least-cost routing, multipath routing, and load balancing. OSPF was derived from an early version of the ISIS protocol.
Network Layer (Protocol Operations)
• Each router provides its services to support upper-layer functions
• Routers pass traffic from all routed protocols over the internetwork
• Adaptive to topology changes
• Routing protocols maintains and distributes routing information
• Information used to select the best path for routing

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