November 2005
Intermediate to advanced
480 pages
13h 38m
English
Content preview from OSPF and IS-IS: Choosing an IGP for Large-Scale Networks
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7.5. BGP and Area Design
You probably have heard that IS-IS—at least when used in support of IP—is seldom found outside carrier and Internet service provider networks. The IGP is the foundation of all but a few very large enterprise networks, and so the many features OSPF offers for multi-area topologies are attractive: The network is likely to have many low-powered, low-memory routers and low-bandwidth links, calling for area designs that can protect these routers and links from being overloaded.
However, the mission of carrier and ISP networks is not routing between points internal to the network but transit routing: receiving packets from outside the network and forwarding them as efficiently as possible to destinations also outside of the ...
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