Re: forward address

From Cisco docs:

The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and
OSPF is not enabled on the next hop interface for those routes.

These conditions set the forwarding address field to a non-zero address:

OSPF is enabled on the ASBR's next hop interface AND

ASBR's next hop interface is non-passive under OSPF AND

ASBR's next hop interface is not point-to-point AND

ASBR's next hop interface is not point-to-multipoint AND

ASBR's next hop interface address falls under the network range specified in
the router ospf command.

Any other conditions besides these set the forwarding address to 0.0.0.0.

--
BR
Tony
Sent from my iPhone on 3
On 22 Sep 2013, at 09:14, Imran Ali <immrccie_at_gmail.com> wrote:
> hi all
>
> some times  we see  forward add as 0.0.0.0  and sometimes  we see an ip
> address
>
> why is this so  ?
>
> what is the concept  of  FA ?
>
> As per cisco doc
> The forwarding address concept allows this extra hop to be avoided because
> it allows Router 1 to specify another router's  IP address as the
> forwarding address.
>
>
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