NBMA and Hello Message

Unanswered Question
Jul 28th, 2009


In NBMA (non-broadcast multiple access), this communications protocol have no ability for send broadcast or multicast. How it is establish connection with neighbor because (Hello Message) send as multicast.



I have this problem too.
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Giuseppe Larosa Tue, 07/28/2009 - 01:46

Hello Auos,

for example for FR by using frame-relay map command with the broadcast option.

FR or ATM NBMA needs to create a copy of each broadcast/multicast packet for each active PVC DLCI.

OSPF has also network types that don't use at all multicast hellos but in this case neighbor commands are needed in the OSPF process.

Hope to help


Giuseppe Larosa Tue, 07/28/2009 - 03:36

Hello Auos,

yes, I mean OSPF hellos sent as unicast to specified neighbor ip address under router ospf process.

Hope to help



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