Hi, can you clarify this:
An exercise states:
"Imagine one of the WAN links on an OSPF
network has gone down, causing a topology
change. What's the reaction
to maintain route consistency
when OSPF notices a change in the
Answer: When a link changes state, a link-state advertisement (LSA) concerning that link (route)
is created by the device that detected the change and propagate to all neighboring devices using a special multicast address. This is
Does the Router which notices the link state change actually floods the network, or in reality the router sends the new LSA to the DR; then the DR would send out the LSA to all other routers in the network ? Thanks for your great help !
Yes, the LSA will be flooded out all OSPF interfaces on detecting link state change. One of the requirements of OSPF is all the routers within an OSPF area has to have an identical database.