OSPF WG members should note well that there is not and never has been any variant of the OSPF protocol that runs over UDP (discounting UDP based tunneling mechanisms where there is a complete inner IPv4 packet). The implementations referred to below are strictly proprietary. Thanks, Acee (speaking as OSPF WG chair) On Jun 29, 2010, at 10:45 PM, Mitchell Erblich wrote:
> > On Jun 29, 2010, at 7:15 PM, Claudio Jeker wrote: > >> On Tue, Jun 29, 2010 at 06:59:28PM -0700, Mitchell Erblich wrote: >>> >>> On Jun 29, 2010, at 6:22 PM, Greg Mirsky wrote: >>> >>>> 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 >>>> >>> >>> Greg, >>> >>> Sorry UDP is NOT a IP transport. >>> These last two words (IP transport) don't make sense. >>> UDP is a protocol, that in many current environments >>> is layered below the IP protocol. >>> >>> Yes, OSPF uses the UDP protocol. >> >> No it does not. OSPF uses its own proto 89 on top of IP. >> OSPF has its own reliability layer to make sure that the LSDB stay in >> sync. >> >> -- >> :wq Claudio >> _______________________________________________ >> OSPF mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/ospf > > Sorry, I misspoke. :( > > Some implementations of OSPF, can use UDP when certain > OSPF capabilities are enabled and/or used. > > It is not a "normal" behaviour specified in the OSPF protocol > and it is normally not used as a transport for OSPF. > > In one instance, UDP can be used when IP address/name and/or > DNS names are resolved within the CLI. Or when > some OSPF functions are executed when xmiting or recving > OSPF protocol pkts. > > Mitchell Erblich > > > _______________________________________________ > OSPF mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/ospf _______________________________________________ OSPF mailing list [email protected] https://www.ietf.org/mailman/listinfo/ospf _______________________________________________ OSPF mailing list [email protected] https://www.ietf.org/mailman/listinfo/ospf
