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I saw the exact same issue on our 3502s with 7.6.130.30.We also have had MULTIPLE issues with the 7.6 code and 1532s acting as a RAP. Cisco recently cooked up 7.6.130.33 to fix those issues - we'll see how the fix works in the field.7.6.130.33 seems...
Regarding CDP and interoperability with non-Cisco switches. Non-Cisco hardware treats CDP as a regular L2 frame and just passes it on, leading to the unpredictable results that you are seeing. Unfortunately there are no GUI or CLI commands that supp...