
Appendix B Concepts
Routing Protocol Options
IP is a connectionless protocol, which means that IP does not exchange control information (called a handshake) to establish an
Internet Packet Exchange (IPX) exchanges routing information using Routing Information Protocol (RIP), a dynamic
Routing Protocol Options
Routing protocols include the following:
•Routing Information Protocol (RIP)
•Enhanced Interior Gateway Routing Protocol (Enhanced IGRP) RIP and Enhanced IGRP differ in several ways, as shown in Table
Table | RIP and Enhanced IGRP Comparison |
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Protocol | Ideal Topology | Metric | Routing Updates |
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RIP | Suited for topologies with | Hop count. Maximum hop | By default, every 30 seconds. |
| 15 or fewer hops. | count is 15. Best route is one | You can reconfigure this value |
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| with lowest hop count. | and also use triggered |
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| extensions to RIP. |
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Enhanced | Suited for large topologies | Distance information. Based | Hello packets sent every |
IGRP | with 16 or more hops to | on a successor, which is a | 5 seconds, as well as |
| reach a destination. | neighboring router that has a | incremental updates sent |
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| when the state of a destination | |
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| destination that is | changes. |
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| guaranteed to not be part of |
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| a routing loop. |
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RIP
RIP is an associated protocol for IP and is widely used for routing protocol traffic over the Internet. RIP is a
By default, RIP routing updates are broadcast every 30 seconds. You can reconfigure the interval at which the routing updates are broadcast. You can also configure triggered extensions to RIP so that routing updates are sent only when the routing database is updated. For more information on triggered extensions to RIP, see the Cisco IOS Release 12.3 documentation set.
Cisco 860 Series, Cisco 880 Series, and Cisco 890 Series Integrated Services Routers Software Configuration Guide
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