Asking the proctor questions isn't a bad thing. It's better to get clarification than to make potentially incorrect assumptions.
Some things are definitely not as clear as they could be. If you're not specifically told how to establish reachability, then adding a network to a routing protocol would be acceptable. Just because a section says to redistribute from RIP to OSPF, it doesn't mean you can't also redistribute from OSPF to RIP, assuming that is not expressly prohibited. As far as reachability is concerned, some practice lab writers tend to go overboard when using static routes or default originate. In my opinion, they should only be used as a last resort. Other than a situation like an OSPF stub area (or odr), there usually is not any reason to send a 0/0 route to get the desired reachability. Version 10 clears up a lot of tasks like this one. Marvin Greenlee, CCIE #12237 (R&S, SP, Sec) Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: [EMAIL PROTECTED] _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roger RPF Sent: Thursday, June 19, 2008 6:51 AM To: 'OSL CCIE Routing and Switching Lab Exam' Subject: [OSL | CCIE_RS] LAB26: IPv6 Part again.... Hi ipexpert, I'm sorry to say that, but the Ipv6 part in LAB26 is very unclear and the instructions are to "rare". If the real lab would be like this, I would have to sit beside the proctor to ask questions all the time...hehehe 1. eBGP between R2 and R8. The PG uses a static route on R8, which violates the initial task. How should we get the R7-R8 network into OSPFv3 to bring eBGP up? Well, since not explicitly forbidden, I configured OSPF area 567 on that link. Maybe a ipv6ip tunnel would also work. BGP comes up but I get the following error: R8(config-router)# *Jun 19 09:17:52.643: %BGP-6-NEXTHOP: Invalid next hop (0.0.0.0) received from ::1:AC11:1902: martian next hop Why that? I can reach the next hop and I can also ping the ipv6 address of the ebgp neighbor...I have no idea 2. On R6 we need to redistribute from Ipv6 RIP to OSPFv3, the same on R2. I guess the idea is to reach from RIP on R6-R9 the networks on RIP R1. Well, since we only have to do one way redistribution this does not work. The PG originates on R6 a default route (general task says not to use default routes), so RIP knows the way out bot on R2 there is nothing like this and it wouldnt work. We would also have to generate a default route into RIP. Or we could do two way redistribution, but would this violate the task??? I really hope that this ipv6 stuff will be more clear in version 10! The rest of this lab is pretty cool, only the ipv6 part makes it very confusing... regards Roger
