OSPF Network Types: Non-Broadcast Multicast
At the point when you assemble a steered network utilizing OSPF as your directing convention of decision you need to think about the way that OSPF will consequently recognize the Layer 2 embodiment type and take on one of 6 different ways to work on that connection.
The first of these 6 practices which we will cover is OSPF Non-Broadcast mode
This Non-Broadcast mode is the default express that OSPF will set an interface to when you execute the order “exemplification outline hand-off” on a sequential interface.
OSPF will consider this media like some other transmission media like Ethernet.
NBMA mists are generally implicit a center and talked geography. PVCs are spread out in a fractional cross section and the actual geography doesn’t give the multi access that OSPF accepts is out there.
OSPF in this mode will endeavor to likewise choose a Designated Router and a Back Designated switch. The choice of the DR and BDR the can turn into an issue on the grounds that the DR and BDR need to have full actual availability with any remaining OSPF switches that exist in the Non-Broadcast organization. In the event that you have a center and talked network were one switch has Frame Relay PVC’s to each spoke then coherently you would design 안전놀이터 the Hub to be the DR and the spokes not to view themselves as a component of the political race process. To do this you should arrange the spokes with the accompanying order: (Assuming we are utilizing the actual interface)
interface sequential 0
ip ospf need 0
On the Hub switch to play it safe set the accompanying order with the goal that it will end up being the DR. (Expecting we are utilizing the actual interface)
interface sequential 0
ip ospf need 255
OSPF won’t send any Multicast traffic over the Non-Broadcast media and because of this you should design the DR with (And BDR on the off chance that you have one)a static rundown of any remaining switches appended to the Non-Broadcast organization, in the model underneath our neighbors are 10.1.1.2 and 10.1.1.3.
To do this you should utilize the accompanying order:
switch ospf 1
neighbor 10.1.1.2 10
neighbor 10.1.1.3 10
The “survey span” is the measure of time a NBMA interface holds up prior to surveying (sending a Hello) to a probably dead neighbor. The neighbor order applies to switches with a capability of being DRs or BDRs (interface need not equivalent to 0).