Comment 2 for bug 1077066

In this instance the aliases are being maintained for a soon to be retired legacy setup, nova.conf is set with: `public_interface = br0`

This is the main bridged interface on the host, the issue arrises when the defined public_interface allready has aliases, per information above the command would appear to be outputting:

ip addr del aa.bb.cc.dd/16 brd 172.30.255.255 scope global dev br0

which in itself is invalid.

pseudo code:

if scope <> global
  cmd = ip addr del $1 scope $5

I am unsure as to the handeling of labels etc, I am looking into this at this time.