Question - in this configuration I noticed that you used the Looppbacks of the routers but the wildcard to include in the network command seems stange... on R2 you have network 10.7.0.0 0.0.0.255 area 3 (but the router ID which I assume is a loopback is actually 10.7.20.123) so I'm assuming it won't be matched correctly by this wild card (or the connection is still possible due to the fact it's loopback and it's in the hello packets?) It's the same on the R1 router where you have the command of "network 10.3.2.0 0.0.0.255 area 1" but the router ID is 10.3.10.5 which won't be matched. Is this config working simply because the network commands here refer to exit via physical interfaces?
@@vikramsinghshekhawat8567 it should be connected to area 0 in order to reduce the over head for routers in each area. So any changes in any of the areas, the area 0 router(s) will be aware and propagate that information to other routers in different areas, if that was not the case then each router running OSPF has to re run SPF algorithm, which is a overhead.
it is mandatory to have direct connection from other areas to the backbone. to determine the function of of a router in ospf. they are called ABR routers, key responsibility is to exchange routes in the two areas.
Question - in this configuration I noticed that you used the Looppbacks of the routers but the wildcard to include in the network command seems stange... on R2 you have network 10.7.0.0 0.0.0.255 area 3 (but the router ID which I assume is a loopback is actually 10.7.20.123) so I'm assuming it won't be matched correctly by this wild card (or the connection is still possible due to the fact it's loopback and it's in the hello packets?)
It's the same on the R1 router where you have the command of "network 10.3.2.0 0.0.0.255 area 1" but the router ID is 10.3.10.5 which won't be matched. Is this config working simply because the network commands here refer to exit via physical interfaces?
Can we say that it is the connection between two ABR routers ??
Why each area should be connected with area0? Any explanation please
because area 0 is a backbone area so each an every area in ospf must connect to area 0 for communication to be happen throughout the network or in AS
anand ashok ok but why it not communicate with another connected area
@@vikramsinghshekhawat8567 it should be connected to area 0 in order to reduce the over head for routers in each area. So any changes in any of the areas, the area 0 router(s) will be aware and propagate that information to other routers in different areas, if that was not the case then each router running OSPF has to re run SPF algorithm, which is a overhead.
Thanks for explanation
Link is not available
thanks for the explanation
Why should each Area be connected with AREA-0?
it is mandatory to have direct connection from other areas to the backbone. to determine the function of of a router in ospf. they are called ABR routers, key responsibility is to exchange routes in the two areas.
Thank you :)