OSPF Totally stubby area

- G
- Guan Foo Wah
  
  Contact options for registered users
posted
18 years ago

Mon, Aug 1, 2005 6:42 AM

Hi,

I am studying CCNP BSCI and this is a question where I couldn't find an answer in my BSCI book. Basically, the OSPF totally stubby area is a Cisco specific implementation. If all routers in area 1 including ABR are Cisco routers, then there shouldn't be a problem.

Now what if the ABR is Cisco while some of the routers in area 1 are not cisco? Will the totally stubby area still work as it ment to be?

Thanks.

- R
- Robert Smales
  
  Contact options for registered users
Vote on answer
posted
18 years ago

Thu, Aug 25, 2005 2:51 AM

Not any more, Extreme switches can also do totally stubby areas:

configure ospf area 0.0.0.1 stub nosummary

As can Juniper routers:

edit protocols ospf set area 1 stub no-summaries

Robert Smales

- R
- Robert Smales
  
  Contact options for registered users
Vote on answer
posted
18 years ago

Thu, Aug 25, 2005 2:59 AM

Also, the key point for certification exams, although all routers in a stub area have to be configured with the stub keyword, only the ABR needs to be configured with the no-summary keyword to make the area totally stubby.

So as long as your ABR is Cisco/Extreme/Junos-based, the rest of the routers in the totally stubby area merely have to be rfc-compliant (such as the ex-Unisphere Juniper ERX, which does not appear to support totally stubby areas)

Robert