So, lets dig into LISP Routing a little more. If you have not
done so, I would recommend you read my first post, since I am
not going to review the concepts here. In this post, I am going
to break things down into three steps: 1) how packets are
forwarded (i.e. the data plane operation), 2) how mapping
information is propagated (i.e. control plane operation), and 3)
how we internetwork with non-LISP locations. For starters, lets
head into the weeds and take a look at the LISP header format.
In the last post, I mentioned there is some flexibility in how
handles IP addressing. The two examples below show a couple of
scenarios: pure IPv4 and a IPv4/IPv6 hybrid: As you can see, the
header is pretty straightforward—the outer (red) header
identifies the source and destination routers, while the inner
(blue) header identifies the source and destination hosts. I am
not going to dig into the LISP header for the purposes of this
post—if you are interested, check out the IETF draft. So, lets
take a look at the day in a