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From: Vincent Jardin <vjardin@wanadoo.fr>
To: Mike Tancsa <mike@sentex.net>, freebsd-net@freebsd.org
Date: Sat, 14 Jun 2003 12:47:40 +0200
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Subject: Re: problems adding interfaces with zebra
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> ifconfig: ioctl (SIOCAIFADDR): File exists
>
> Because the route is already installed locally as pointing to machine A=
 via
> interface B1. (.i.e. I have redistribute connected enabled)
>
> Short of killing ospfd and zebra how do I get around this ?

It is a FreeBSD's issue. It can be repeated without Zebra:
 route -n add 12.0.0.0 192.168.0.1
 ifconfig fxp0 12.0.0.1 alias
 ifconfig: ioctl (SIOCAIFADDR): File exists

Regards,
  Vincent

PS:

su-2.05b# route -n get 12.0.0.0
   route to: 12.0.0.0
destination: 12.0.0.0
       mask: 255.0.0.0
    gateway: 192.168.0.1
  interface: fxp0
      flags: <UP,GATEWAY,DONE,STATIC,PRCLONING>
su-2.05b# route -n delete 12.0.0.0
delete net 12.0.0.0

su-2.05b# ifconfig fxp0 12.0.0.1 alias=20
su-2.05b# route -n get 12.0.0.0
   route to: 12.0.0.0
destination: 12.0.0.0
       mask: 255.0.0.0
  interface: fxp0
      flags: <UP,DONE,CLONING>