Just because one method is chosen, does not mean that is the only possible method.
The proctor guide EXPLICITLY states that EITHER stub or NSSA could be used: "... Area 78 cannot allow Type 5 LSA’s, so that means it will be a stub area of some kind. Reading ahead to section 5.4 we notice that R8’s interfaces may need to be added into OSPF via redistribution. So this would make Area 78 a Not-So-Stubby-Area (NSSA). Alternatively, we could use the “ip ospf 1 area” command to add all of R8’s interfaces to OSPF and leave Area 78 as a “stub” area with the “area 78 stub” command. In this example, I’ve accommodated both options and used “area 78 nssa” (mainly for those of you who redistributed to meet the objectives). This is the kind of situation where asking the proctor could be helpful – I’d recommend asking whether they “require redistribution or the ‘ip ospf area’ command”. If they specify one, do it - if they don’t care go with what’s easier for you. ..." Section 5.4 also states that all remaining connected networks should be redistributed into a routing protocol. If networks are redistributed into OSPF on R8, that makes R8 an ASBR. 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] Progress or excuses, which one are you making? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Suresh Mishra Sent: Friday, June 27, 2008 4:04 PM To: OSL CCIE Routing and Switching Lab Exam Subject: [OSL | CCIE_RS] Vol2 -LAb-7 OSPF Stub issue Hello all The task 3.6 configures area 78 as NSSA area to eliminate type 5 LSAs. It gives reference to TASK 5.4 for that in which it is said that all the ASBRS should be able to redistribute with other routing protocols. However, in this LAB neigther router R8 or R7 is configured as ASBR and are not running any other routing protocol. In that case a regular STUB area will do. Why do we need to configure NSSA? Thanks Suresh
