Friday, July 23, 2010

CCNP - ENTERPRISE - OSPF - Area Types - Totally Stubby Area (Dude!)

Totally Stubby Area - Cisco Proprietary, reduces the Routing Table further.

  • Blocks external Type5 LSA's, Summary Type3 LSA's, and ASBR Type4 LSA's
  • Totally Stubby Area only recognises intra-area routes and the default route
  • ABR's inject the default route in to the Totally Stubby Area
  • Each area router picks the closest ABR as its DFG
Configure a Totally Stubby Area
1) Configure OSPF as usual
2) Define the area to be Totally Stubby, as a Stub on all routers in the area, using the cmd:
R4(config)#router ospf 1
R4(config-router)#area 4 stub

3) On the ABR configure Area 3 to be Totally Stubby:
R5(config)#router ospf 1
R5(config-router)#area 4 stub no-summary

On the ABR the Routing Table will not change.
On the Totally Stubby router the routing table should only see routes in it's area and a default route to the ABR.

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