[OSL | CCIE_RS] Lab 27 - OSPF for Area 115

[Michael Senno]

I had some problems with Area 115. I believe that a virtual link can NOT use another virtually linked area as a transit since the v-link makes it a stub. Therefore area 115 would not be able to use Area 15 as a transit, since area 15 is already using a virtual link.  The lab gets around that by putting Cat 1 into Area 1 through VLAN 40, however this is not specifically allowed in the lab. The PG does explicitly say that you can't just add it to the IPExpert VLAN though (Area 0). Why can you do one and not the other? Then, after you do put Cat1 into Area 1 and make the v-link, why do you still need a v-link from r2? Can't Cat 1 act as the virtual link to attach both Area 15 and 115? It appears there is someway that OSPF prevents that, is there somewhere to get a better explanation on this? I believe the issue may be which router r5 and r6 views as the ABR to the transit area, but not sure and also wondering if that would be the same problem for the other v-link?   I'm assuming this has something to do with the fact Cat1 is injecting an default-cost of 14 instead of 15 (its a hop further I guess). Is a GRE tunnel possible for this scenario?   Please advise. This seems to be a good learning opportunity.     Michael J. Senno   [EMAIL PROTECTED] IM: [EMAIL PROTECTED] mobile: 917-273-1169   Add me to your address book... Want a signature like this?