ISIS: Intermediate System-Intermediate System, similar to OSPF as pre-cursor with less options, not IP protocol rather part of CLNS Stack, enabling basic process, remember enabled interface by interface, looked at net statement, confusing at first but ok after going through it a couple of times. Comprises the area id, system ID and end selector [or selector byte depending on which text you’re reading]. Now both IE & Ipexpert workbooks indicate you are provided with the relevant details such as “use NET address 49.00AA.0000.BBBB.BBBB.00 where AA is the BGP AS number and BBBB.BBBB is the routers loopback address” so we simply have to apply the numbers provided in the lab to the net statement – care is required. Knowing how to apply level 1 and level 2 and why, how to ensure interfaces do not participate [passive cmd] – know how to do a couple of these things more than one way as constraints can be applied such as do not use is-type or do not use route-map. How to apply security and manipulate performance, etc.
Verification is done with show commands such as sh clns nei, sh isis database, sh isis area-tag topology and of course – Golden Moment [as NMC say] or my reasoning is Checkpoint – Ping Interfaces!
Note: Has anyone else noticed how slow UniverCD is since they changed it last year – it honestly takes an additional 30 seconds minimum per lookup – Average 10 lookups per lab attempt?
Final Note: An IE Customer A. Joe Mann passed CCIE SP last week and hinted over at the IEWB-SP forum [see links at right] that ISIS is heavily hit! – I’m gonna read my notes again!!!!