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Another important topic to discuss is the impact of the network topology on your network monitoring

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if an interface goes down, does it impact the ability of the NMS to collect data from your network

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devices?

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So as an example, if you viewed the network topology in something as simple as Visio or within one

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of your management tools, how would an outage affect the ability of your network management system

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to collect data from devices in your network?

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If you had devices at a remote site and you wanted to collect statistics from those devices, how will

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a link down affect your ability to get to those statistics?

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If there was only a single link to the remote site and you had a central network management system and

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the link went down, the NMS would no longer be able to access those devices to collect data.

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So you may need to deploy a network management collector on the remote site to collect data remotely

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rather than trying to collect everything from a central site.

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So this would mean, as an example, that you deploy a distributed network management architecture rather

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than having a single centralized network management system.

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This is especially true where you have multiple data centers.

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In that case, you might want to deploy multiple copies of NPM one in each data center that then forwards

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data to an enterprise operation console or EOC.

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So remember, if you can't get to it, you can't monitor it.

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So it's important that you keep track of your network topology because you need to ensure that you have

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reachability status when the topology changes.