NBMA and Hello Message

auosdavid2000 · ‎07-28-2009

Hi,

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.

BR,

Auos.

Giuseppe Larosa · ‎07-28-2009

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

auosdavid2000 · ‎07-28-2009

Did you mean Hello Message send it as unicast.

Giuseppe Larosa · ‎07-28-2009

Hello Auos,

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

Hope to help

Giuseppe