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Configuring OSPF 1
- Thread starter FaithH
- Start date
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1
- #2
CCIEWANNABE
MIS
The central concept behind OSPF is internetworks Areas. The areas are used to control traffic flow and filter out unwanted routing table details.
Router(config-router)#network 10.0.0.0 0.255.255.255 area 0
The above in example command put the subnet 10.0.0.0 into ospf area 0. The main benefit of OSPF is redirectin groute updates between areas.
In addition you will need to specify the ranges of IP address and assign area ids
There are three stepsd you need to do
One: get into global Config
Two: Enable OSPF
Three: Define the interface(s) define the area ID for that interface with the command NETWORK address wildcard-mask AREA areea-id
In example for step three:
router ospf 112
NETWORK 172.38.10.0 0.0.0.255 AREA 2
NETWORK 172.40.10.0 0.0.255.255 AREA 3
NETWORK 172.39.30.0 0.0.0.255 AREA 4
NETWORK 0.0.0.0 255.255.255.255 AREA 0
link:
see Implementation and Configuration Route once; switch many
Router(config-router)#network 10.0.0.0 0.255.255.255 area 0
The above in example command put the subnet 10.0.0.0 into ospf area 0. The main benefit of OSPF is redirectin groute updates between areas.
In addition you will need to specify the ranges of IP address and assign area ids
There are three stepsd you need to do
One: get into global Config
Two: Enable OSPF
Three: Define the interface(s) define the area ID for that interface with the command NETWORK address wildcard-mask AREA areea-id
In example for step three:
router ospf 112
NETWORK 172.38.10.0 0.0.0.255 AREA 2
NETWORK 172.40.10.0 0.0.255.255 AREA 3
NETWORK 172.39.30.0 0.0.0.255 AREA 4
NETWORK 0.0.0.0 255.255.255.255 AREA 0
link:
see Implementation and Configuration Route once; switch many
CCIEWANNABE
MIS
in case you have a slow access link. Route once; switch many
CCIEWANNABE does a good job of explaining the configuration side of things.
However,
For routing to work with ospf you must redistribute other routing protocols to it, (or vice versa), understand the concept of hello packets,timers,neighbors the link state database,adjacencies, and how an area can be classified.
The type of media is also VERY important with ospf. For instance using ospf on a NBMA network(think FR) is different than on a a multiaccess(think ethernet) network.
The concepts of stub areas and nssa (not so stubby areas) are important to understand as well and can save you overhead.
OSPF is definitely one routing protocol to read up on before using IMO.
Good Luck
However,
For routing to work with ospf you must redistribute other routing protocols to it, (or vice versa), understand the concept of hello packets,timers,neighbors the link state database,adjacencies, and how an area can be classified.
The type of media is also VERY important with ospf. For instance using ospf on a NBMA network(think FR) is different than on a a multiaccess(think ethernet) network.
The concepts of stub areas and nssa (not so stubby areas) are important to understand as well and can save you overhead.
OSPF is definitely one routing protocol to read up on before using IMO.
Good Luck
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