just fixed the video for this one...enjoy!
OSPF Over Frame-Relay: Point-to-Point
Scenario:
As the senior network engineer for a Dutch fishing company you are responsible for connecting all the different branch offices to the main network. The WAN technology you are using is Frame Relay, and you need to run OSPF over this WAN connection. It's impossible to broadcast on this WAN connection.
Goal:
- The frame-relay switch has been preconfigured for you, as you can see in the topology picture the following PVC's has been configured:
Router Barracuda to Salmon:
Barracuda: DLCI 102
Salmon: DLCI 201
Router Barracuda to Herring:
Barracuda: DLCI 103
Herring: DLCI 301 - Router Barracuda is the "Hub" router and the other 2 routers are the "Spoke" routers.
- Do not change any configuration on the Frame-Relay switch.
- You will need to create sub-interfaces on Router Barracuda.
- Configure the following IP addresses:
Router Barracuda:
S0/0.102: 192.168.12.1 /24
S0/0.103: 192.168.13.1 /24
L0: 1.1.1.1 /24
Router Salmon:
S0/0.201: 192.168.12.2 /24
L0: 2.2.2.2 /24
Router Herring:
S0/0.301: 192.168.13.3 /24
L0: 3.3.3.3 /24 - Configure all serial interfaces for encapsulation Frame-Relay.
- Disable Frame-relay inverse arp on all serial interfaces.
- Use 'clear frame-relay inarp' to make sure the ARP table is cleared.
- Configure the correct DLCI numbers on all routers and make sure you can ping every IP address from router Barracuda.
- Configure the OSPF network type to "point-to-point" on all serial interfaces.
- Configure OSPF on all 3 routers, make sure you have full connectivity. All IP addresses including the loopbacks should be reachable.
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
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Video Solution:
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Comments (12)
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fliprich 2011-01-08 20:01:34Hey, I noticed that this lab works fine without configuring the OSPF network type on the s0/0 interfaces. Is point-to-point a default OSPF network type?
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ReneMolenaar 2011-01-09 18:10:12If you configure a sub-interface for frame-relay you have to specify if you want to use point-to-point or point-to-multipoint.
OSPF point-to-point, point-to-multipoint BC / NBC are compatible with each other since none of them requires a DR/BDR...just need to change the timers to accomplish this.
I'm not sure what the default OSPF network type is, if you type a 'show ip ospf interface x/x' it will show you the network type and timers.
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fliprich 2011-01-09 19:21:14
Oh OK. I got ya.
I checked and it looks like the OSPF network type did default to PTP. Not sure if it would do that on the BC networks but I guess I'll find out in the later labs. Thanks!
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demej 2011-02-17 15:30:55If I might make a Suggestion. . if you want to save some processor and memory the Fame Relay Switch GNS3 provides works greate you can map out all your ports then just attached the routers to the ports.
1>Drag he Frame-Relay switch over and click on it
2>map your ports accordly this case it would be
1:102 - 2:201
1:103 - 3:301nice lab though.
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ReneMolenaar 2011-02-22 15:39:39
Hi Whiterabbit,
The emulated frame-relay switch works pretty good indeed. Good hint for people with slower computers that need the performance
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router_rugby 2011-05-15 20:19:26Noobs like me need a little more than suggestions & hints. [removed]void(0);Does the FRSW just help out in the gns3 process, or can you use it to enhance the performance of a slower computer. I`ve got a couple of clunkers at home that could use some help on the performance end.
I`ve looked around the net and haven`t figured it out yet, so if you`ve got time, a little more direction on this subject would help.
If I figure it out before you get a chance, I`ll post it back here, or is there a more appropriate place it could go?
Great site BTW and I`m digging the labs I`ve been able to get to!
Richard
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ReneMolenaar 2012-04-02 08:56:33
Hi Richard,
Sorry that I never answered this comment before. GNS3 is able to simulate a frame-relay switch and it does exactly the same thing as a Cisco router that is configured as a frame-relay switch.
The only difference is that a router running in GNS3 consumes CPU power and about 150MB of ram. If you have a modern PC with a I5/I7 CPU this really doesn't matter but for those of us that have older hardware and only 1 or 2GB of memory it might be better to use the simulated frame-relay switch in GNS3 compared to running an emulated router.
Rene
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Mike 2012-03-26 18:12:26Hi
Its not bad but noticed it should say Router Barracuda to Herring:
Barracuda: DLCI 103
Salmon: DLCI 301(should say HERRING NOT SALMON)The router numbers are a bit off also when compared to the loopbacks you want setup.
Also seeing as this is a partial mesh with one subnet per VC you should only be using p2p interfaces anyway so there's no need to configure a p2p ospf network.
Not bad though.
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ReneMolenaar 2012-04-02 09:12:55
Hi Mike,
Thanks I fixed the DLCI number.
Be careful with the interfaces/subinterfaces. You could configure everything on the physical interface of router Herring and Salmon but the default OSPF network type is non-broadcast on the physical interface:
Code:
HERRING#show ip ospf interface s0/0
Serial0/0 is up, line protocol is up
Internet Address 1.1.1.1/24, Area 0
Process ID 1, Router ID 1.1.1.1, Network Type NON_BROADCAST, Cost: 64On the sub-interface the OSPF network type is point-to-point. Just keep this in mind when you use the physical interface
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jbhummer 2012-04-28 15:00:29Hi Rene,
I downloaded this lab and its just 4 routers--nothing configured on any of them. Can you check the file.....
Thanks
joe
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ReneMolenaar 2012-05-01 10:22:40
Hi Joe,
There is something in the configs but not too much. The routers only have "encapsulation frame-relay" on the interfaces. I didn't preconfigure the IP address because you'll have to use sub-interfaces. There's also a config for the frame-relay switch in it...
How's the studying going? Making progress?
Rene