Studying OSPF and I think I'm going crazy, I reading the Cisco Press book and the links off the Cisco.com site. Here are some questions that I have after reading the material:
- I keep reading that OSPF will flood the area with LSA's after an update or change and then is says that it will only send LSA's to the DR and BDR. Which is it?? Does it send LSA to neighbors or only to DR's?
"OSPF uses flooding to exchange link-state updates between routers. Any change in routing information is flooded to all routers in the network."
- What is exactly in an LSA(doesn't matter which type)? If someone has some info on this I would really like to read it, along with other OSPF packet types (DBD, LSR, LSU, LSA TYPES, etc...) I haven't found to much information on them.
- The cost of an interface is based on the bandwidth; does the router use the bandwidth command to retrieve this information?
- Now for the question that I'm having the biggest issue with. When routers are on a multi-access network and they have multiple neighbors do they stop at a 2WAY state with all other neighbors except the DR and BDR which they are full? And by doing this they will only create adjacencies with the DR and BDR? So when a router boots up for the first time its not going to send its directly connected neighbors its topology table since it has to go through the DR?