Hello,
In a conventional SDN setup, what is the preferred way of connecting
controller(s) to the switches? Assuming each switch has a direct link to
the controller, IMHO, is a quite optimistic approach. To the best of my
knowledge, there are two alternatives for this problem.
*1.* You can directly connect controller ports of switches to another
network of which controllers are connected too.
*[In the figures, I use double line for switches' controller port
connections and single line for the others.]*
+------+
| ctrl |
+------+
|
+--------------+
| ctrl network |
+--------------+
||
||
+----+
| sw |
+----+
In this case, who manages the controller network? In real-world setups, is
it preferred to go with an unmanaged switch network for controller
networks? Or do people deploy SDN for controller networks as well?
*2.* You can short-circuit switch controller ports to the regular switch
data ports, and connect controller network to one of data ports.
++======++
|| ||
+------+ ||
| |===++
| sw | +--------------+
| |--------| ctrl network |
+------+ +--------------+
This scheme has significant implications in terms of both security and
overlap of control & data channels.
Moreover, comparing these two schemes, I don't think the first one is
applicable to WAN setups, right? That is, in a WAN, this or that way
control channel needs to overlap with the data channel, IMHO.
Any comments are greatly welcome.
Regards.
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