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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7.2. Area Reliability
A reliable area is one that can sustain the failure of one or more of its components without isolating a large segment of the network. The more failures the area can tolerate, the more robust the area.
Large network segments can be isolated in one of two ways:
The failure of a router connecting two areas isolates an area from the rest of the network (Figure 7.2).
Figure 7.2. A failure of one of the ABRs will isolate its attached nonbackbone area from the rest of the network.
The failure of a router or link partitions an area (Figure 7.3).
Figure 7.3. A failure of any one of the three links connecting the ABRs across area ...
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