09-04-2016 09:46 PM - edited 03-08-2019 07:17 AM
Quoted from jeff doyle book TCP/IP vol-1 "on point-to-point networks,updates are sent multicast address AllSPFRouters(224.0.0.5).On point-to-multipoint and virtual link networks,updates are unicasted to the interface addresses of the adjacent neighbors"
But,point-to-point and point-to-multipoint bot network types support i)dynamic neighbor discovery ii)no DR and BDR elections occur
then why one update are sent multicast and other are sent unicast....
regards
swapan
09-05-2016 02:50 PM
Have a look at this document and look under Point-to-Multipoint non-broadcast Network section
https://ccieblog.co.uk/ospf/ospf-hello-protocol
HTH
09-06-2016 12:15 AM
hello reza,thank u for your reply.TCP/IP VOL1 by jeff doyle books(page364 ospfv2) mentions that "On point-to-point networks,update are sent to the multicast address ALLSPFrouters(224.0.0.5)".
My point of view.on point-to-point network,there is no DR and BDR election.then it should be unicast.
please clear my confusion....
09-06-2016 10:40 AM
Hello ,
OSPF only use unicast in networks in wich your router don't know your neighbours, for example frame relay.
In this networks you need configure your neighbours, because don't have broadcast packet.
Unicast or broadcast is for type of network, not if theres DR/BDR or not.
09-05-2016 03:06 PM
OSPF use unicast when type of network don't support broadcast like:
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