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

Tags:
Loopback
LSA
OSPF
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 (10.0.1.1) , loopback 2 (10.0.2.2) ,loopback 3 (10.0.3.3) and loopback 4 (10.0.4.4) ,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

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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