Network technologies and trends

Jan 24 2016   5:28AM GMT

How to configure Stub Area in OSPF – Series 1?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Routing protocols

In this series of posts lets configure OSPF Stub Area, but before proceeding further lets summarize the below topology

OSPF Topology

  1. Two OSPF Areas, Area 0 and Area 5
  2. R1, R2 and R4 are part of Area 0 and OSPF is configured on the directly connected links on each router ( R1 – R2 link , R1-R4 link)
  3. R4 has four loop back interfaces  loopback 1 ( , loopback 2 ( ,loopback 3 ( and loopback 4 ( ,these loopback interfaces networks are redistributed into OSPF
  4. R2-R3 are part of Area 5, R2 happens to be a ABR
  5. OSPF Area 5 is configured on the interfaces connected between R2-R3.

Currently Area 5 is a normal area and its not been configured as a stub area, currently R2 installs the R4 loopback interface networks as Type 5 LSA and forward the same to Area 5

We can see from the below snap shot R2 received R4 loopback networks as Type 5 LSAs and the routes are installed as Type 2 External OSPF routes


OSPF - R2-2

R3 does installs the R4 loopback networks as Type 2 External OSPF routes and they are received as Type 5 LSAs

R3 -E2 routes

R3 -Type 5


In the next post lets see what will happen when we configure Area 5 as a Stub Area.

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