I normally don't autoroute anything, but I'd like to try it on a board I'm working on. Problem is this board is 8 layers and my seat is limited to 6 layers. I'm thinking I can remove the layers where I have the power and gnd planes from the stack up and disable those nets in CM. Then add the layers back in after the routing has been done.
If this will work, how do I "lock" any existing traces I have routed to prevent the autorouter from moving them?
i dont use autorouter either
from my experience, using autoroter, disregards the following(or i may have wrong settings):
2. differential routing
3. limiting the use of vias
and with regards to your question, autorouter seems not to change previously routed traces, instead, it routes to avoid these existing traces.