Use clear ospf processto implement the change

1.
respectively; connect PC lab network port to the same switch, port 2,4,6,8, respectively. (port 1 2 for R1 and PC1, port 3 4 for R2 and PC2, port 5 6 for R3 and PC3, and port 7 8 for R4 and PC4) Connect fa0/1 of R1, R2, and R3 into another switch, as shown in the picture. Turn on routers, erase startupconfig and reload. 2. On each router, configure the following: 21 host name as shown and privileged password as cisco (enable secret cisco) 22 interface address as shown in the diagram (LAN, WAN and Loopback) 23 disable auto DNS request (no ip domainlookup) 24 telnet password cisco (pass cisco ; login) 25 logging message synchronization on console and telnet session (logg sync) 26 console session no time out; telnet session time out 20 minutes show ip int br and show cdp nei to check your result.
3.

7.	show ip ospf nei, find the DR:____________________ BDR:_______________________ At this point, please ask the proctor to disable your OSPF connection on the second switch, except R4. Remove routerid command and remove loopback 0 interface from your configuration.

What is the default route of your router?________________ why?____________________________

DR:_______________________ BDR:___________________________

10. Save your configuration to NVRAM and tftp server. (ping to check connectivity before tftp) 11. debug ip ospf adj and debug ip ospf events
Change interface status/info and implement the change to see the result.

Note: You might need to save your configuration and reload the router to make the change effective.