Thursday, January 8, 2009

Design Considerations: OSPF Network Stability

OSPF Network Stability
Your ability to scale an OSPF internetwork depends on your overall network structure and IP addressing scheme. As outlined in the discussions concerning network topology and route summarization, adopting a hierarchical addressing environment and a structured address assignment will be the most important factors in determining the scalability of internetwork. Network scalability is affected by both operational and technical considerations.

Operationally, OSPF networks should be designed so that areas do not need to be split to accommodate growth. Address space should be reserved to permit the addition of new areas. Scalability should always be taken into consideration when designing your network. All routers keep a copy of the LSDB. As the network grows, they will eventually reach a point where the database becomes too large, resulting in inefficiency in your routing. Additionally, the LSAs will be flooded throughout the network, resulting in a congestion problem. The capability of your OSPF network to scale properly is determined by a multitude of factors, including the following:

 Router Memory Requrement
 CPU Requirement
 Available Bandwidth
 OSPF Security

shivlu jain

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