Github user serg38 commented on the pull request:
https://github.com/apache/cloudstack/pull/1094#issuecomment-162319994
Since you are testing L3 connectivity existing switch patch to router
shouldn't overlap an ip range used by the new subnet. Cidr #1 should work fine
. You might also try disconnect existing switch from router to see if test
passes. For test #4 we tested we lrouter patched over to l3 gateway without
existing switch . For test# 3 you need to have l2 gateway to match the one
specified for nvp device. The issue we observed was if any of the test fail for
any reason the cleanup on nsx side doesn't work so a manual cleanup might
require to remove existing router port left over from previous tests that has
overlapping cidr
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