OSPF Virtual-links and tunnels

Hi All,

I have a question regarding the virtual link and tunnels. When we have to
use tunnel beside those listed here?
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example0918
6a00801ec9ee.shtml#using

I have made a setup as below:

R6--A0--SW1--A0--R3--A345--R5--A345--SW2--A24--SW4--A234-SW3--A234--R2

A - abbreviation of word Area

In this setup to have full connectivity I had to:
1. Setup a virtual link between R3 and SW2 using Area 345 as Transit Area.
2. Setup a tunnel between SW2 and SW4 and put it into the Area 234.

Is there any other solution in such scenario to have full connectivity
between R6 and R2? For example using only virtual-links?

Regs,

-- 
-=[ Greg Cegielski ]=- 
Blogs and organic groups at http://www.ccie.net