Dear Glen, the OSPF uses UDP which is unreliable IP transport, not like TCP which is used by BGP. You've noticed that some LLS (DD and LSA) have reliability support on protocol level while others (Hello) don't. If Hello goes through (at least one of three to keep adjacency up) then all other exchanges will work, even with retransmissions.
Regards, Greg On Tue, Jun 29, 2010 at 5:37 PM, Glen Kent <[email protected]> wrote: > Mitchell, > > > Let me take the 2nd item: > > > > Independent of LLS, OSPF uses the IP protocol, and the IP protocol is > > a best effort protocol. Second, even if the OSPF pkt is delivered to > > a destination, the network interface may itself drop and or reject it, > > because of exaustion of resources, i.e, recv descriptors and / or > > socket or mbuf network buffers. > > > > This is even before the destination's OSPF recv's the pkt. > > Ok. I interpreted this as saying that while the receiver may receive > the Hello packet, it may still not be able to receive the LLS data, > which got me intrigued. > > Glen > _______________________________________________ > OSPF mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/ospf >
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