carp vs. ospf ?

[clifford bailey]

Hi,

Having got a nice redundant firewall setup working with openbsd 4.2 pf + 
carp + pfsync. My next step was to integrate it with ospf. My initial 
plan was to continue to treat the firewall pair, as a single 'virtual 
firewall' within the network and use ospf to advertise routes through 
just the carp interfaces. Looking at a couple of docs for ospf though, I 
was disappointed to find out I can't do this. I am not familiar with the 
internals of ospf, so there may be an obvious reason for this 
limitation, is it easy to explain, or could someone point me towards an 
explanation?

Instead of doing this, I am now intending to drop carp out of the 
picture altogether and just use ospf to provide the failover. Is this 
the recommended solution? Does anyone else run this solution?

Thanks in advance!