From: Don Stokes <don(a)daedalus.co.nz>
No. The /20 supernet continues to be advertised, and
the new /24 net
is also advertised. Since the /24 advertisement is more specific,
traffic is routed to it; if it's not inside the /24 but inside the /20,
the less specific route is used.
Holes are all well and good, but they create greater administration
For example at Waikato, holes in 18.104.22.168/16 have created nightmare access
lists and administration overhead (not to mention CPU overhead) to prevent
end user traffic from re-using NetGates international capacity when a
202.36.x.x/24 network for some reason disappears from the advertisers
backbone the traffic defaults back to NetGate due to the /16.
It is obvisouly a much greater problem at Waikato due to the open nature of
the exchange, but I am sure that as network complexity continues to ...
complex:) this will cause problems for other providers.
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