Netbrain
Home NetBrain Product One-Skill-at-a-Time Search Mark Forums Read
Go BackThe Net-BrainerOne-Skill-at-a-Time Challenge: How are routes propagated in OSPF Transit Area?

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-15-2009, 12:25 AM
admin admin is offline
Administrator
 
Join Date: May 2009
Posts: 59
Default 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

To view the answer, please click Here
Reply With Quote
Old 10-31-2013, 01:07 PM
redouane redouane is offline
 
Join Date: Oct 2013
Posts: 2
Default 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

Last edited by redouane; 10-31-2013 at 01:27 PM.
Reply With Quote
Old 10-31-2013, 01:26 PM
redouane redouane is offline
 
Join Date: Oct 2013
Posts: 2
Default 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.
Reply With Quote
Old 11-01-2013, 03:55 AM
NetBrainTAC NetBrainTAC is offline
Administrator
 
Join Date: Dec 2012
Posts: 467
Default 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 View Post
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.
Reply With Quote
Reply

Bookmarks

Tags
one-skill-at-a-time, OSPF

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Forum Jump

All times are GMT -4. The time now is 05:26 AM.
Powered by vBulletin
Copyright 2000-2010 Jelsoft Enterprises Limited.
Copyright 2009 NetBrain, Inc. All rights reserved.