Umesh

Umesh_MS wrote:

> Heloo..
>
> According to RFC 2328, section 16.1.1, there are two case for
> calculating next hop. The second case is for network. In that case I
> didn't get that how to calculate next hop and outgoing interface..
> can anybody explain this..(with the help of a figure)
>
> regards..
>
>
> Umesh

In the second case, the parent vertex is a network that
            directly connects the calculating router to the destination
            router. The list of next hops is then determined by
            examining the destination's router-LSA. For each link in
            the router-LSA that points back to the parent network, the
            link's Link Data field provides the IP address of a next hop

            router. The outgoing interface to use can then be derived
            from the next hop IP address (or it can be inherited from
            the parent network).

R1 R2 R3
| | |
---------------------------

imagine R1 is root and R2 is the DR further R2 is the parent of R3
if R2 was a router node and R1 didn't have a direct connection through a
transit network to R3 in this case R3 will just inherit the outgoing
interface and next hop from its parent ( R2 )
here R2 is a transit node so as stated we check if R3 announce a link
back to its parent ( R2 ) and the Link data field will give us the next
hop address
for outgoing interface it can be inherited from its parent ( R2 ) or
found directly since we have an common interface with the next hop IP
address

Sina

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]