OSPF Question

[coutuser]

R1 1.1.1.1
R2 2.2.2.2
R3 3.3.3.3
R4 4.4.4.4

Assume that R2 R3 and R4 are in the network with R2 as DR and R3 as BDR.

I have now added R1 into the network. However, the assignment of DR and BDR is still the same.

I want to make R1 as DR and R2 as BDR without restarting all the routers.

How is this possible?

 

[coutuser]

I dont understand. Do you shut/no shut the loopback interface only? I dont want the physical interface to be down (obviously).

CCNA: establish ospf adjacency so that routers can talk to dr/bdr. dr talks to abr and abr talks to asbr and so on.

CCNP
(1)1???
(2)1 3 ???
(3)13 5 ???
(4) 1 3 7 ???

 

[charliebrown]

seriously wat is ur objective in defining the DR and BDR in a broadcast network? unless it's nbma network where certain router need to be DR in order for adjacency to be formed btw the hub and spokes, then defining the DR makes sense.

 

[hellslayer]

first of all, u need to understand how DR/BDR election works. OSPF has no pre-emption. Priority > router-id.

for ur case, set the priority of the R1 to a higher number.
R1: ip ospf priority 200
R2: ip ospf priority 150

then do a "clear ip ospf process".
simple right?