So, it’s been over a week since my last lab attempt and I have had plenty of time to reflect. I will say that I underestimated the troubleshooting section considerably. My advise is when you hit a difficult question, do not linger on it, move on and try to come back if you have time. It’s hard to assess which tickets are the challenging ones without a little investigation. I will say that if you cannot solve the ticket within 10-15 minutes… MOVE ON. Next…
Experience telepresence with your family/friends/coworkers. Try our free Jabber Video client today. HD video camera recommended. https://www.ciscojabbervideo.com/home http://www.cisco.com/en/US/prod/collateral/ps7060/ps11303/ps11310/ps11328/data_sheet_c78-628609.html Jabber Video system requirements Windows Windows 7, Vista, or XP (SP 2 or newer), with: • OpenGL 1.2 or newer • For 720p HD calls, Intel Core2Duo @ 1.2 GHz or better • For VGA calls, Intel Atom @ 1.6 GHz or better Webcam (built-in or external; you’ll need an HD webcam for the other side to see you in HD) Broadband…
Preface: To clear old entries in the multicast table, use “clear ip mroute *”. This command usually will allow changes to be sync:ed, but not always. In the worst case scenario, you may have to reload the device. Modifications to a working multicast environment is not recommended if you cannot interrupt traffic forwarding. Be sure to schedule maintenance window in a REAL production environment. PIM: Signaling protocol that uses the unicast routing table to preform RPF checks. Dense mode: Flood to all multicast enabled interfaces and downstream routers prune…
Braveheart spoof by Cisco marketing. http://www.cisco.com/go/rightnetwork
Enjoy this short (3min) cartoon. Link to YouTube Video
So, first a little history on Spanning tree protocol (STP). Based on an algorithm created by Radia Pearlman in 1985. http://en.wikipedia.org/wiki/Radia_Perlman Became a standard IEEE protocol in 1990. Still widely deployed. Flavors of spanning tree. 802.1d (ieee), 802.1w (rapid), and 802.1s (mst). Evolution of STP, Cisco vPC (2-way non blocking, still requires STP) and Fabric Path (eliminates STP completely). TRILL is a standardized version of Fabric Path. Both TRILL and Fabric Path utilize a link state protocol (IS-IS) as their loop prevention method. Specific Cisco enhancement to 802.1d (prior to 802.1w):…
Cisco impresses with UCS: If you’re tempted to think of Cisco‘s Unified Computing System (UCS) as just another blade server — don’t. In fact, if you just want a bunch of blades for your computer room, don’t call Cisco — Dell, HP, and IBM all offer simpler and more cost-effective options. But, if you want an integrated compute farm consisting of blade servers and chassis, Ethernet and Fibre Channel interconnects, and a sophisticated management system, then UCS might be for you….