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admin 06-14-2009 11:25 PM

Challenge: How are routes propagated in OSPF Transit Area?
 
According to the following diagram,virtual link was configured on R4.4.4.4 and R5.5.5.5 to set up a connection between area 3 and area 0. Area 1 is a transit area

What would be the path from 50.5.5.5 (Area 3) of R5.5.5.5 to 1.1.12.1 (Area 0) of R1.1.1.1?

A) Red Path: R5.5.5.5 > R4.4.4.4 > R1.1.1.1
B) Blue Path: R5.5.5.5 > R4.4.4.4 > R3.3.3.3 > R2.2.2.2 > R1.1.1.1
http://www.netbraintech.com/share/ho...ansit_area.gif
To view the answer, please click Here

redouane 10-31-2013 12:07 PM

Re: Challenge: How are routes propagated in OSPF Transit Area?
 
The packets go through the path : R5.5.5.5 > R4.4.4.4 > R1.1.1.1

redouane 10-31-2013 12:26 PM

Re: Challenge: How are routes propagated in OSPF Transit Area?
 
The packets go through the Path: R5.5.5.5 > R4.4.4.4 > R1.1.1.1 because the lowest cost of the route through this path, if you check the routing table of R4.4.4.4,it has a best route toward the subnet 1.1.12.0 through R1.

NetBrainTAC 11-01-2013 02:55 AM

Re: Challenge: How are routes propagated in OSPF Transit Area?
 
Hi redouane,

You are correct, the correct path is R5.5.5.5 > R4.4.4.4 > R1.1.1.1.

By default for Cisco routers, the OSPF Area Transit Capability feature is enabled. Allowing OSPF Area Border Router (ABR) to discover shorter paths through the transit area for traffic forwarding that would normally need to travel through the virtual-link path.

For more details, feel free to check out the answer page.

Quote:

Originally Posted by redouane (Post 22649)
The packets go through the Path: R5.5.5.5 > R4.4.4.4 > R1.1.1.1 because the lowest cost of the route through this path, if you check the routing table of R4.4.4.4,it has a best route toward the subnet 1.1.12.0 through R1.



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