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Practice with OSPF

Posted on 2005-03-21
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Last Modified: 2010-04-17
I have two spare 2501s in my internal LAN not doing anything. I would like to use them to practice OSPF on.

Can anyone give me any recommendations on how to begin the process?
I"m assuming I'll need a few PCs behind each router


RouterA--------PPP----------RouterB
PC                                      PC

config# router ospf
config-router# ????


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Question by:dissolved
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4 Comments
 
LVL 43

Expert Comment

by:JFrederick29
ID: 13593116
Basic configs to get you started:

If using a single area:

RouterA:

int e0
ip address 10.0.0.1 255.255.255.0
no shut

int s0
ip address 192.168.0.1 255.255.255.252
clock rate 2000000 (if DCE end of serial cable)
no shut

router ospf 1
network 10.0.0.0 mask 0.0.0.255 area 0
network 192.168.0.0 0.0.0.3 area 0

Router B:

int e0
ip address 10.0.1.1 255.255.255.0
no shut

int s0
ip address 192.168.0.2 255.255.255.252
no shut

router ospf 1
network 10.0.1.0 mask 0.0.0.255 area 0
network 192.168.0.0 0.0.0.3 area 0

If using multiple areas:

RouterA:

int e0
ip address 10.0.0.1 255.255.255.0
no shut

int s0
ip address 192.168.0.1 255.255.255.252
clock rate 2000000 (if DCE end of serial cable)
no shut

router ospf 1
network 10.0.0.0 mask 0.0.0.255 area 1
network 192.168.0.0 0.0.0.3 area 0

Router B:

int e0
ip address 10.0.1.1 255.255.255.0
no shut

int s0
ip address 192.168.0.2 255.255.255.252
no shut

router ospf 1
network 10.0.1.0 mask 0.0.0.255 area 2
network 192.168.0.0 0.0.0.3 area 0

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Author Comment

by:dissolved
ID: 13593480
Thanks! What is the significance of "areas?"
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LVL 43

Accepted Solution

by:
JFrederick29 earned 2000 total points
ID: 13593540
To seperate a large network into smaller "areas".  It helps cut down on routing table size.  It makes a large network more manageable.  With a good IP addressing strategy and summarization, a very large network can be very efficient.  Routers in an area will only know about the other internal routers in the same area, for inter-area traffic, the Area Border Router is used to get to the other areas.
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Author Comment

by:dissolved
ID: 13594565
You rule!
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