Chapter 4b - Routing loops And other problems CCNA 2...

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1 12 Jan 2012 Routing loops And other problems CCNA 2 Chapter 4
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2 12 Jan 2012 Routing loops A problem that can occur with distance vector routing protocols It happens when systems are slow to converge so that routers have inconsistent routing tables Packets can be forwarded in the wrong direction Packets can be forwarded endlessly round loops
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3 12 Jan 2012 Convergence The system is converged when all routers have consistent information about the network Suppose a link goes down – the adjoining routers know about it but the others don’t The system is not converged again until all routers know about the link going down This can be slow – each router has to update its routing table and pass it to its neighbours
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4 12 Jan 2012 Converged All routers have a route to A
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5 12 Jan 2012 Link down – not converged
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6 12 Jan 2012 Link down – not converged
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7 12 Jan 2012 Link down – not converged
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8 12 Jan 2012 Link down – not converged
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9 12 Jan 2012 Link down - converged
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This note was uploaded on 01/12/2012 for the course NETWORKING 2083 taught by Professor Cathymarak during the Winter '12 term at NorthWest Arkansas Community College.

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Chapter 4b - Routing loops And other problems CCNA 2...

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