Network technologies and trends

Jan 26 2016   5:16AM GMT

How to configure OSPF Totally Stubby Area in Cisco Routers- Series 1?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Tags:
areas of use
Cisco
Cisco Routers
Loopback
OSPF
OSPF protocol

In this series of posts lets configure OSPF Totally Stubby Area, but before proceeding further lets summarise the below topology

OSPF Totally Stubby Area

  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 happened 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 totally stubby area,  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, also we could see the interface connecting R1-R4 are also advertised as Type 3 LSA

R2 - R4 route

R2 - type 5

R3 sees R4 loopback interfaces network as Type 5 LSA and R1-R4 , R1-R2 links network 192.168.14.0/29 , 192.168.12.0/29  as Type 3 LSAs

R3 LSA table

In next post lets see by what impact Area 5 will have especially after configuring it as  OSPF Totally Stubby Area.

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