Friday 23 July 2010

BSCI - Study pointers - OSPF

With my exam fast approaching this post is a simple list of points that for some I'm struggling to commit to memory.

You'll probably cast your eye of these and think 'what's the problem?' or 'D'uh!' but you're not me. And it's only easy if you know the answers.

So here they are:

  • When configuring a virtual link you specify the are to be traversed plus the Router I.D. of the end point.
  •  e.g. - R1(config-router)#area 5 virtual link
  •  Then on remote router: R3(config-router)#area 5 virtual-link
  • When working on a Frame-relay environment you need to enter the network type cmd under the OSPF process:
  • R2(config-router)#ip ospf network non-broadcast
  • At the interface you need to set OSPF priority to prevent DR election on the routers that will not be a DR:
  • R2(config-if)#ip ospf priority 0
  • An INIT state can exist when a router ID has not been seen in a received Hello Packet
  • A Stub area doesn't accept information from outside of the OSPF AS
  • ABR's maintain a separate link-state database for each area they are attached to.

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