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Excerpts from 严超's message of 2014-10-23 01:08:09 -0700:
> Hi, All:
>         I recently deployed an Overcloud machine using Undercloud. And when
> login to the overcloud . It has the following route:
> stack at undercloud002-undercloud-xjjnlfe5guan:~$ route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 0.0.0.0         192.0.2.1       0.0.0.0         UG    0      0        0 eth5
> *169.254.169.254 192.0.2.1       255.255.255.255 UGH   0      0        0
> eth5*
> 192.0.2.0       0.0.0.0         255.255.255.0   U     0      0        0 eth5
>        I wonder who wrote the *169.254.169.254 *route and when did it
> happened ? It is build in the image or otherwise ?
> 

DHCP allows pushing static routes via option 21. So we push said route
via DHCP. This is a built-in feature of Neutron.