excel 2007 code 128 font Problem 3: Variance, Metric Components, and Weights in Objective-C

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Problem 3: Variance, Metric Components, and Weights
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In some cases, you may have redundant links that are not load balancing like you would expect Before looking any further, you need to make sure you know IGRP's rules regarding load balancing These were explained in the "Load Balancing" section at the beginning of the chapter; but just to refresh your memory, I will briefly restate them here:
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The maximum paths (as in the maximum-paths command discussed in 23) defines how many paths IGRP will load balance over The default is 4 All routes to a given destination must be less than the lowest-cost route multiplied by the variance For example, if the lowest-cost route is 25,000 and the variance is 4, all routes to the same destination with a metric of 99,999 or less are considered acceptable for load balancing The next hop router listed in the route entry must have a lower metric to the destination network than the lowest metric route to the destination network on the local router
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For starters, use the commands discussed in the "Problem 1: Discontiguous Networks and VLSM" section to make sure that you are actually getting a route to the network over the redundant connection Once you have determined that redundant routes are being received for the network in question, you can figure out which of these rules are potentially causing you grief
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First, make sure your maximum paths are set to greater than 1 You can do this with the show running-config command If you do not see a maximum-paths statement, then you are using the default of 4 Once you have ensured that the router is allowing redundant paths, check to make sure that traffic sharing is enabled for load balancing Again, use the show running-config command If you see an entry for traffic-share, make sure it is not set to traffic-share min If you do not see a traffic-share statement, again, it means everything is fine because you are using the default setting of traffic-share balanced, which enables load balancing Once you have ensured that load balancing is enabled, check your variance setting against the lowest and highest metrics that are advertised for your redundant paths You can see the variance setting using the show ip protocol command, and you can see the metric for routes that are being advertised to you using the debug ip igrp transactions command If the variance is within an acceptable range and you are still not getting load balancing to function, then the final step is to ensure that the redundant router's local metric for the path in question is lower than the best local metric Again, you can check this by using the debug ip igrp transactions command If this turns out to be your problem, then you can improve one or more of the metric components (delay, typically) on the remote router to reduce the remote router's metric; however, remember that there are consequences associated with changing the metric components (Again, refer to the earlier "Load Balancing" and "Metric and Maximum Hops" sections for a more thorough explanation) If load balancing is working some of the time but is not always functioning, then you may want to check to see whether the advertised metric (or local metric) is changing at all If you are using the reliability or load weights on any routers along the path, it is possible for the metric to change enough to cause the route to be dropped from the table If so, either change the weight on the reliability and load to enable small rather than large metric changes, or increase the variance on the local router
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