3com 5500-ei pwr Installation Instruction

 

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Static routing is easy to configure and requires less system resources. It works well in small, stable 

networks with simple topologies. It cannot adapt itself to any network topology change automatically so 

that you must perform routing configuration again whenever the network topology changes. 

Dynamic routing is based on dynamic routing protocols, which can detect network topology changes 

and recalculate the routes accordingly. Therefore, dynamic routing is suitable for large networks. It is 

complicated to configure, and it not only imposes higher requirements on the system than static routing, 

but also occupies a certain amount of network resources. 

Dynamic routing protocols can be classified based on the following standards: 

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Interior Gateway Protocols (IGPs): Work within an autonomous system, typically including RIP, 

OSPF, and IS-IS. 

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Exterior Gateway Protocols (EGPs): Work between autonomous systems. The most popular one is 

BGP. 

 

An autonomous system refers to a group of routers that share the same route policy and work under the 

same administration. 

 

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Distance-vector protocols: RIP and BGP. BGP is also considered a path-vector protocol. 

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Link-state protocols: OSPF and IS-IS. 

The main differences between the above two types of routing algorithms lie in the way routes are 

discovered and calculated. 

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Unicast routing protocols: RIP, OSPF, BGP, and IS-IS. 

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Multicast routing protocols: PIM-SM and PIM-DM. 

This chapter focuses on unicast routing protocols. For information on multicast routing protocols, refer 

to the part discussing Multicast.