01-18-2013 01:23 AM - edited 03-04-2019 06:45 PM
Hello All.
does OSPF only work on point-to-point links? i have OSPF configured on some links which are not on point-to-point links but OSPF is not forming neighbor relations but with routers on point-to-point links OSPF is working fine. what is it?
Thanks
01-18-2013 01:25 AM
Hi,
With right configuration, OSPF will work on any link (P2P or broadcast). Can you share the cofiguration?.
-Nagendra
01-18-2013 07:11 AM
By default ospf running over point-to-point links use multicast hellos to form the neighbor relationship. My guess is that you need a neighbor statement under the ospf process. As some link types by default dont send the multicast hellos
The configuration needed depends on the network type of the links. Here is a quick break down of the different network types and requirements.
01-18-2013 07:31 AM
Are you using the following command in your point to multipoint link configurations?
ip ospf network point-to-multipoint
This will need to be entered at every link location.
This may help with your current problem.
01-18-2013 12:37 PM
HI,
Opsf can be defined with different types which can be configured with the default hello times for neighbor establishment.
Dr/BDR election - dyanmic discovery of neighbour multiple routers in subnet
Broadcast networks ( ethernet) yes yes yes 10 sec hello / 40 sec dead
NBMA networks ( frame-relay) yes n/a yes 30 sec hello / 120 sec dead
Point -to-point n/a yes n/a 10 sec hello / 40 sec dead
Point-to-multipoint n/a yes yes 30 sec hello / 120 sec dead
Point-to-multipoint non-broadcast n/a n/a yes 30 sec hello / 120 sec dead
Virtual link n/a n/a n/a
Also these are compatible
Point -to-Point & Point-to-Multipoint
Point -to-Point & Point-to-Multipoint non-broadcast
( required to change hello value to same)
Broadcast & non-broadcast
Also all the above fit into one of two network types:
Transit networks have two or more attached router - packets that pass through "transit"
Stub network have a single attached router - packets have source or destination addresses belong to it.
res
Paul
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide