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In this case, we are emulating a network of BMv2 devices with a 4x4 torus topology controlled by a 3-nodes ONOS cluster. onos.py and bmv2.py are distributed in the ONOS repository under tools/dev/mininet, for this reason, we can avoid using the environment variable $BMV2_PY.
BMv2 Device Context Service API (WIP)
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