Ok...I'm doing this project for my network admin class at school where I have to setup a complete network. Here's the diagram below, all the routers are 2501's except FrankenSwitch which is a 4550 acting as a frame-relay switch, the PIX is of the 501 flavor, the switch is a 1900. The Diagram is not complete but it has everything that pertains to my question:
EDIT: Apparently Geocities doesn't let you link to images. Anyone know of a free service that I can upload my jpg to?
For now I'll just explain it. All the serial links on the internal network are 172.16.248.x /30. The PIX sits on the edge of the network in between the ISP and first router, RtrBelfast. The inside interface of the PIX (E1) is 10.0.1.200/24. The E0 interface on Belfast plugs into the PIX and is 10.0.1.1/24.
Belfast is connected via serial links to Cork and Lemrick. These 3 routers make up OSPF Area 0. Cork is connected via frame relay to Galway, there is a 4550 (FrankenSwitch) acting as a frame-relay switch sitting between Cork and Galway. Galway is a legacy router which only supports RIP. Therefore at Cork I am doing redistribution of OSPF into RIP for Galway to use.
Galway can see the entire 172.16.248.x network. It can ping every other interface on the network. The problem is that I could not get RtrGalway to see the 10.0.1.x network on RtrBelfast or the PIX FwEdge. I was figuring this had something to do with me redistributing OSPF into RIP (which is taking place on RtrCork). I tried just adding the network into RIP but it gave it a metric of 16, so it wouldnt work.
I came across a document saying that when you redistribute OSPF into RIP and you need to advertise a different network, you have to add a static route pointing to 'null0' on whatever device is doing the redistribution, in my case RtrCork. I needed to advertise the 10.x.x.x network, but Cork only has interfaces on 172.16.248.x. So on Cork, I put in the following route, the redistributed statics into RIP:
ip route 10.0.0.0 255.0.0.0 null0
router rip
redist static
This worked. Galway can now see and ping E0 of Belfast and E1 (inside) of the PIX.
The problem is, I dont really understand what I did. It worked, but I dont understand it. I'm wondering if someone can explain to me what I just did, and why I had to do it and if there is another way to do what I did. The Cisco doc's that told me what to do didn't really tell me why, and I'd like to be able to explain to my teacher why I had to do this, and also for my own edification.
Thanks.
EDIT: Apparently Geocities doesn't let you link to images. Anyone know of a free service that I can upload my jpg to?
For now I'll just explain it. All the serial links on the internal network are 172.16.248.x /30. The PIX sits on the edge of the network in between the ISP and first router, RtrBelfast. The inside interface of the PIX (E1) is 10.0.1.200/24. The E0 interface on Belfast plugs into the PIX and is 10.0.1.1/24.
Belfast is connected via serial links to Cork and Lemrick. These 3 routers make up OSPF Area 0. Cork is connected via frame relay to Galway, there is a 4550 (FrankenSwitch) acting as a frame-relay switch sitting between Cork and Galway. Galway is a legacy router which only supports RIP. Therefore at Cork I am doing redistribution of OSPF into RIP for Galway to use.
Galway can see the entire 172.16.248.x network. It can ping every other interface on the network. The problem is that I could not get RtrGalway to see the 10.0.1.x network on RtrBelfast or the PIX FwEdge. I was figuring this had something to do with me redistributing OSPF into RIP (which is taking place on RtrCork). I tried just adding the network into RIP but it gave it a metric of 16, so it wouldnt work.
I came across a document saying that when you redistribute OSPF into RIP and you need to advertise a different network, you have to add a static route pointing to 'null0' on whatever device is doing the redistribution, in my case RtrCork. I needed to advertise the 10.x.x.x network, but Cork only has interfaces on 172.16.248.x. So on Cork, I put in the following route, the redistributed statics into RIP:
ip route 10.0.0.0 255.0.0.0 null0
router rip
redist static
This worked. Galway can now see and ping E0 of Belfast and E1 (inside) of the PIX.
The problem is, I dont really understand what I did. It worked, but I dont understand it. I'm wondering if someone can explain to me what I just did, and why I had to do it and if there is another way to do what I did. The Cisco doc's that told me what to do didn't really tell me why, and I'd like to be able to explain to my teacher why I had to do this, and also for my own edification.
Thanks.
