Ospf

controlcontrol Member Posts: 309
Hi All,

Came across this when reading up on OSPF (which is still very new to me)

"When designing an OSPF backbone area, you should make sure there is little or no possibility of the backbone area being split into two or more parts by a router or link failure. If the OSPF backbone is split due to hardware failures or access lists, sizeable areas of the network will become unreachable"

Does anyone have a diagram that visualises the statement? I'm having a hard time trying to understand what the above means.

Comments

  • martell1000martell1000 Member Posts: 389
    i guess they mean something like that

    where the failure of one link would leave 2 seperate groups of routers
    And then, I started a blog ...
  • controlcontrol Member Posts: 309
    Ah I see. So we would be talking about the middle link in this case?
  • martell1000martell1000 Member Posts: 389
    yes - if this one goes down you area is beeing split in half.
    And then, I started a blog ...
  • njktnjkt Member Posts: 31 ■■□□□□□□□□
    What would be the optimal design in this case then?
  • Greenmet29Greenmet29 Member Posts: 240
    I'd imagine a design that is completely redundant.
  • martell1000martell1000 Member Posts: 389
    which would be called a "full mesh" but you will never see this if you have more than 3 or 4 routers in an area. it always depends on your budget and on the topology. just keep in mind that you dont have a design where a singe link outage leads to a seperation. in other words: do not chain routers - use star or ring topologys if possible.
    And then, I started a blog ...
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