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Being able to view reports via a browser eliminated the need to collect, duplicate, and distribute reports With this feature, anyone who wants the report (and has the proper permission) may collect the report from the network management system This worthwhile feature is far from universal
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Keeping a history of the exception condition is so useful that we count it as a necessity It is not only necessary to be able to identify problem areas and equipment, but also to keep a history of similar problems on that and similar equipment Keeping history alone is not sufficient The network management system must permit searching the data and displaying historical trends Trend analysis is the key here Remember that the goal of a network management system is to maximize uptime This cannot be achieved by reacting to problems It can only be accomplished by anticipating problems Therefore, in addition to keeping a historical record that lets us find out when and where this problem last appeared, the network management system can, with the proper software, do a linear regression on the historical data and predict when (but probably not where) the problem might next appear (If, for example, the problem were a hardware failure associated with a particular component, the frequency of failure might tell us when it might again appear If the problem were traffic related, for example, buffer overflow, and the consequence was a system slow down or crash, then the historical traffic data could allow us to identify potential trouble spots that exhibit similar traffic profiles to the failed node Then we could go back and look at traffic through the failed node from last week/month/year and use that data as a threshold, or trap value, to predict failures of similar nodes under similar traffic conditions)
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Alarms must be programmable and presented in a logical fashion so that they convey the relative importance of the message Programmable filters are a must to permit concentration on the most important alarms first
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It should be noted that the more statistics the network management system keeps, the more data it must collect from all components (agents) in the network, and therefore the more traffic will be added to the network by the network management system Again, the goal is to try to keep the bandwidth requirements of the network management system down to one percent of network traffic In small networks, this is easy to achieve In networks of thousands of nodes, a thoughtful use of alarms and a prioritized polling sequence must be employed to achieve this goal
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There is no better way to learn about a network management system than to live with it for a few months before you buy it This provides the opportunity to find out how user friendly the network management system really is The vendor s demonstration always looks good They showcase their strengths and minimize their weaknesses Their presenter is thoroughly familiar with the product, and can really make it sing (How long did it take her to become that proficient ) In reality, it is often difficult to take advantage of a prepurchase trial offer Although the vendor is willing to let you try the software for a few months, it takes management commitment to dedicate resources within the organization to this trial A network management system is not something that can be evaluated in someone s (nonexistent) spare time Remember, it isn t the initial outlay that is important, but the ongoing lifecycle costs
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Much is made of this gee whiz feature And, to be sure, it is a convenience to have a network management system that will create a network map (One could argue that we should have been keeping the network map up-to-date as we designed and grew the network Unfortunately, most networks and especially LANs were never really designed, they just grew) How the mapping function works and what information is available from the map is more important than the map itself First, the map should be readable Second, it should permit zooming in and out In the show-me-the-whole-network mode, the map of a large network will be too dense to read It should provide the capability to zoom in until the subsystem of interest is displayed The mapping function from different vendors works with varying degrees of success There are two basic ways of implementing the mapping function The network management system can use SNMP information from each agent, or it can observe the traffic on the network The SNMP approach yields a map more quickly, but can only display managed devices Tracking traffic flow can theoretically find every interface or port on the network, but could take months of operation to finally determine a map (In some cases, it is impossible to create a map) Thus, two points must be made First, accumulating the information to draw the map is not a 10-minute job Depending on the size of the network, it could take hours to days to months Second, the accuracy of the map is dependent on how extensively each node on the network supports SNMP For example, several prominent vendors don t support standard MIBs As noted, there are standard MIBs and vendor-specific MIBs In order for your network management system to utilize the vendor specific MIBs, they must be loaded into the manager function For normal (here read simple ) networks, the mapping function works well and fairly quickly That means, it works for Ethernets connected with routers and bridges, where each interface on the router is its own subnet Today, however, we tend to use fully switched Ethernets where each device is on its own switched port from a LAN switch The advantage is that each port is buffered so that there are no collisions on the network A second advantage is that one can create virtual LANs (VLAN) where devices on different ports of the switch can be made members of the same broadcast domain or subnet This permits you to design traffic flows on the various LAN segments in order to minimize response times and keep broadcast traffic confined to those devices that are members of the same logical net The disadvantage from a network management system point of view is that it is between difficult and impossible for the mapping function to create a map because there are managed devices hiding behind, or within, other managed devices This is especially true if the LAN switch doesn t support transparent bridging or standard SNMP MIBs The next fly in the ointment is the development of ELANs (Emulated LANs) These are similar to VLAN (Virtual LANS), where we are emulating LANs by using an ATM switch and edge devices that are LAN switches Here again, the ATM switch and edge device may not provide the MIB support necessary to build an accurate map of your network
We tend to expect too much from the mapping function Consider the difference between the logical and physical network In the first case (see Figure 32-7 ), the logical and physical networks are the same We would expect the mapping function to find or draw this picture
Figure 32-7: Logical and physical networks In Figure 32-8 , we have a common configuration for today s networks All the devices (1 9) are on the same IP subnet However, for traffic reasons there are only two VLANs A and B segments comprise one, while the other is made up of segments B and D For example, devices 1, 2, 3, and 5 are in one broadcast domain, while devices 4, 5, 6, 7, 8, and 9 are in another This appears logically as shown in Figure 32-9 Different vendors network management systems will yield different network maps in this case The best (for example, as close as you are going to get) will be from a network management system that watches network traffic
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