OSPF Question

[laxmicisco]

if there are 2 routers are connected with each other over Fiber cable from sfp ports then what kind of network they should called as in OSPF segment ??

Thanks

[balaji.bandi]

it should be point to point, since it is connected to back to back. there is no other device to participate between. 

[jalejand]

By deafult, these will be Broadcast OSPF network type.
Transit network for the OSPF perspective, as 1 neighbor has been discovered on it, LSA type 2 Generation is created.

Tunnels, Serial interfaces, Virtual-Links are considered P2P by definition.
If these two routers are expected to be P2P, you can configure these as P2P network type, reducing the ammount of information on database and the number of lookups that OSPF needs to do for SPF.

[Joseph W. Doherty]

As SFPs are usually "seen" as Ethernet, by default, it would be treated like a copper Ethernet segment, which works, but normally you would manually define it as p2p (same as you should for a similiar copper Ethernet segment).