CCNP TSHOOT 642 832 Quick Reference by Brent Stewart

By Brent Stewart

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If only one side is configured for Etherchannel, look for Etherchannel ports that are error-disabled. n The channel might form, but traffic might still be traveling predominately over a single link. This is because traffic is statistically multiplexed using a three-bit hash. This means that the traffic is split over eight paths, and an etherchannel of three links will split the load in a 2:1:1 ratio. Fix this by using 2, 4, or 8 links. Second, the hash uses a userselectable Ethernet or IP field.

Using different size packets and setting the DF bit allows testing MTU. When the MTU limit is reached, all subsequent pings will be dropped. © 2010 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 69 for more details. [ 34 ] CCNP TSHOOT 642-832 Quick Reference CHAPTER 3 by Brent Stewart Troubleshooting Tools Another nice testing technique is to change the source interface. Pings are normally sourced from the transmitting interface. Using an internal interface as the source shows that the receiving device and the intermediate routers understand how to route back to that prefix.

One easy, but not pleasant, way to see a memory problem is to load a version of IOS that requires more RAM than is present on the router. Memory can also be depleted by a memory leak—a bug that assigns memory to processes but does not clean up when the process is complete. Memory leaks can be recognized over time using show memory allocatingprocess totals and show memory dead and by researching known bugs within CCO. If found, the only solution is to move to a known good version of IOS. Memory leaks sometimes appear on interfaces as buffer leaks.

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