Thomas Graf wrote: > Yes there is, it's called neighbour probing. Link state updates are > sent periodically and acked. It's there to handle crashed OSPF software > and oversubscription. Then after DCs were introcued in rfc1793 it got > unuseable and wasn't reintroduced until rfc3883, it's back there and > in use.
The same is true for any OSPF link. Only periodical hellos are used for that in standard case. Demand circuits are there to suppress periodical hellos and link state update refreshes - ie. if there is no real application traffic going over demand circuit, link may stay down. What RFC3883 does, is that it defines mechanism to detect if neighbour is really still alive if link will be brought up and used for traffic. That's all. -- Hasso Tepper Elion Enterprises Ltd. WAN administrator - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
