# OSPF Point-to-Point Network Type over Frame-Relay
**URL:** https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921
**Category:** Lessons Discussion
**Created:** [December 22, 2016, 1:05am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921 "2016-12-22T01:05:51Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [December 22, 2016, 1:05am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/1 "2016-12-22T01:05:51Z")
This topic is to discuss the following lesson:
> **[OSPF Network Type Point-to-Point over Frame-Relay](https://networklessons.com/ospf/ospf-network-type-point-to-point-over-frame-relay)**
>
> This lesson explains the OSPF point-to-point network type on a frame-relay network. This is one of the many network types OSPF supports.
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [October 13, 2013, 4:48pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/2 "2013-10-13T16:48:06Z")
Keep in mind that the physical interface for frame-relay is always non-broadcast.
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### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [April 30, 2014, 3:26pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/3 "2014-04-30T15:26:13Z")
Hi Rene!
I´ve tried the way you said but it didn´t work! So i google it and found a command
Spoke(config-if)# ip ospf network broadcast, after that it worked!
---
### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [May 1, 2014, 11:08am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/4 "2014-05-01T11:08:36Z")
Hi Gabriel,
OSPF network broadcast will work but it’s normally used for frame-relay point-to-multipoint topologies like in [this example](https://networklessons.com/ospf/ospf-network-type-broadcast-over-frame-relay "OSPF Broadcast Network Type"). For frame-relay point-to-point it’s best to use the point-to-point or point-to-multipoint network type.
On the other hand, you can make all the OSPF network types work on any given topology…
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [May 19, 2014, 2:19am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/5 "2014-05-19T02:19:04Z")
Hi Rene!
correct ur code plz!
it needs:
`Spoke(config-if)# ip ospf network point-to-point`
and without this,
` #show ip ospf neighbor`
doesnt show anything.
for example I used it in my code and just after that:
```
Router(config-if)#
00:26:29: %OSPF-5-ADJCHG: Process 100, Nbr 192.168.2.1 on Serial2/0 from LOADING to FULL, Loading Done
```
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [May 23, 2014, 2:59pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/6 "2014-05-23T14:59:05Z")
Hi Sarah,
Take a close look at the syslog message of your OSPF neighbor, you are running OSPF on the physical interface. By default OSPF configures the physical interface as “non-broadcast”. If you use a point-to-point sub-interface, OSPF will automatically configure it as the point-to-point network type 🙂
Rene
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [May 23, 2014, 6:34pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/7 "2014-05-23T18:34:58Z")
ok thanks Rene, I didn’t know this.
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [August 27, 2014, 1:19pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/8 "2014-08-27T13:19:06Z")
Hey Rene! Congrats on your splendid easy-to-remember OSPF network types. My question is this: why would you wanna use any of these network types? Are there preferable ones over others? Are there any tech limitations between SP’s?
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [August 28, 2014, 8:00am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/9 "2014-08-28T08:00:02Z")
Hi Apostolis,
Nowadays you really don’t have too worry much about these network types on a real network. For a point-to-point link you can just use “point-to-point” and for Ethernet just use the “broadcast” type. The others are more for networks like frame-relay but you won’t see that much anymore…
Rene
---
### Author:  [@system](https://forum.networklessons.com/u/system)
#### Post date: [September 30, 2014, 6:43pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/10 "2014-09-30T18:43:03Z")
Just get CCNA today !
Thanks René
---
### Author:  [@johnfrades](https://forum.networklessons.com/u/johnfrades)
#### Post date: [August 3, 2015, 5:38am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/11 "2015-08-03T05:38:37Z")
thanks for this awesome lesson and breakdowns of network types, i understand them clearly.
Just a question, what does multipoint on subinterface do? like “int s1/0.111 multipoint” is it the same with point-to-multipoint?
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [August 3, 2015, 8:14pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/12 "2015-08-03T20:14:04Z")
Hi John,
By default the physical interface for frame-relay is always point-to-multipoint. If you only have point-to-multipoint then there’s no need to use the sub-interface.
If you have a combination of point-to-point and point-to-multipoint then you should create sub-interfaces, one for point-to-point and another for point-to-multipoint.
Rene
---
### Author:  [@hussien.samer](https://forum.networklessons.com/u/hussien.samer)
#### Post date: [September 3, 2015, 2:35pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/13 "2015-09-03T14:35:23Z")
Hi Rene,
You mentioned that Point-to-Point Connection also Can be used for single IP subnets ? How can this happen ? I think we have overlabs with sub-interfaces ? or I’m wrong ?
Can you please explain what do you mean at this point ?
hussein sameer
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 3, 2015, 7:52pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/14 "2015-09-03T19:52:12Z")
Hi Hussein,
Point-to-point is used when you have one subnet per PVC, unlike point-to-multipoint where you can have one subnet for multiple PVCs.
What do you mean with the overlapping sub-interfaces? we don’t have any here 🙂
Rene
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### Author:  [@hussien.samer](https://forum.networklessons.com/u/hussien.samer)
#### Post date: [September 3, 2015, 8:11pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/15 "2015-09-03T20:11:45Z")
Hi Rene,
At the beginning of lesson you mentioned that we have to know four things about OSPF point-to-point :-
1- Automatic neighbor discovery so no need to configure OSPF neighbors yourself.
2 - No DR/BDR election since OSPF sees the network as a collection of point-to-point links.
3 - Normally uses for point-to-point sub-interfaces with an IP subnet per link.
4 - Can also be used for single IP subnets.
I did not understand the last one ??
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 3, 2015, 8:17pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/16 "2015-09-03T20:17:08Z")
Hi Hussein,
I just reworded it as it sounds a bit confusing. What I meant is that you can use OSPF point-to-point as well on frame-relay topologies where you have multiple PVCs and only one subnet.
Rene
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### Author:  [@hussien.samer](https://forum.networklessons.com/u/hussien.samer)
#### Post date: [September 3, 2015, 8:34pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/17 "2015-09-03T20:34:29Z")
Thanks Rene I got it now
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [September 17, 2015, 2:37pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/19 "2015-09-17T14:37:47Z")
Hi Ajith,
The reason we use frame-relay here is because it’s a CCNP ROUTE topic.
On Ethernet interfaces, it’s much simpler…the default OSPF network type is “broadcast” and there’s not really a reason to change it. If it’s an Ethernet link between two routers then you could change it to point-to-point since there’s no reason to have a DR/BDR election there.
Rene
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### Author:  [@jmwalker24](https://forum.networklessons.com/u/jmwalker24)
#### Post date: [January 31, 2016, 9:47pm UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/21 "2016-01-31T21:47:13Z")
Rene – in my class I have to discuss OSPF over Frame Relay. Im having a hard time grasping this. Specifically - I have to discuss a single subnet for every PVC – or – a single subnet for all routers using point to point subinterfaces associated with each PVC. So my understanding is….
“Single subnet for all routers” – uses Point to Multi-Point (point to point subinterfaces) –. It’s the Point to Mulit-Point Broadcast and Point to Multi-Point NON Broadcast that is throwing me. I understand Frame Relay is a NonBroadcast MultiAccess (NBMA)…. So what is Point to Multipoint Broadcast?
“Single subnet for all routers using point to point subinterfaces associated with each PVC” - is this point-to points?
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### Author:  [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [February 1, 2016, 10:55am UTC](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921/22 "2016-02-01T10:55:29Z")
Hi Jason,
When configuring frame-relay, we have two options:
- [point-to-multipoint](https://networklessons.com/frame-relay/how-to-configure-frame-relay-point-to-multipoint/)
- [point-to-point](https://networklessons.com/frame-relay/how-to-configure-frame-relay-point-to-point/)
The links above will show you a configuration example for each. The main difference is that point-to-multipoint uses a single subnet for all PVCs while point-to-point uses a different subnet for each PVC.
Now when it comes to OSPF, this can be confusing yes…here are all network types:
- [non-broadcast](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-non-broadcast-network-type-over-frame-relay/)
- [broadcast](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-broadcast-network-type-over-frame-relay/)
- [point to multipoint](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-point-to-multipoint-network-type-over-frame-relay/)
- [point to multipoint non-broadcast](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-point-to-multipoint-non-broadcast-network-type-over-frame-relay/)
- [point-to-point](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-point-to-point-network-type-over-frame-relay/)
One of the main differences between broadcast/non-broadcast and the point-to-multipoint network types is the next hop that we use, take a look here:
[OSPF network types IP next hop](https://networklessons.com/cisco/ccie-enterprise-infrastructureospf-next-hop-ip-address-with-different-network-types/)
Frame-relay is NBMA but with the correct frame-relay maps, we can “emulate” broadcast traffic so that you can forward multicast/broadcast traffic on the PVCs.
Rene
[Next page](https://forum.networklessons.com/t/ospf-point-to-point-network-type-over-frame-relay/921.md?page=2)