CCIE: STP (802.1d)

CCIE: STP (802.1d)

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):…

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CCIE: 802.1q (QinQ tunneling/802.1ad)

CCIE: 802.1q (QinQ tunneling/802.1ad)

One of my personal favorite L2 subjects to discuss. When I was at the service provider this was a very cost effective Metro solution to extend customer VLANs. No routing protocols on the CPE and no expensive EoMPLS hardware required from the SP perspective. Simple and effective. You will hear many names for the outer tag (S-TAG, metro tag, etc…) just remember that the outer tag is the unique SP ID for that customer and the inner tags are the…

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CCIE: VTP or not to VTP, that is the question.

CCIE: VTP or not to VTP, that is the question.

In *most* productions networks device limitations (VLAN,TCAM entries) must be taken into consideration. This is one of the downsides of using VTP. All switches will get the entire database regardless if they have local assignments or even are in the transit L2 path. Transparent mode and manually creating the necessary VLANs may be your best option. Switches to not create a STP instance for unnecessary VLANs thus conserving resources and CPU cycles. If you are using VTP be sure to enable pruning to conserve bandwidth…

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Transformer Prime to get ICS on the 12th!!!

Transformer Prime to get ICS on the 12th!!!

Most of you that know me are well aware about my excitement for the Asus Transformer Prime this month. I have been waiting since the announcement for a tablet utilizing the Tegra 3 (Quad Core) mobile chipset. Now I find out even better news today thanks to Engadget. ICS will be release on the 12th! Man this is double awesomeness. Share your thoughts. Will ICS work well on a tablet? Should it have dual modes/personalities to detect phone vs. tablet…

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Happy New Year!!!

Happy New Year!!!

Welcome 2012! Wishing everyone a healthy, joyous, and blessed new year. I really don’t like new year resolutions but, this year has to be the year I pass the CCIE lab. <GRIN> -shaun

Cisco Impresses with UCS

Cisco Impresses with UCS

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….

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OSX (10.6) High CPU Usage

OSX (10.6) High CPU Usage

I was having issues with my battery life and identified a process called “MRT” that was constantly running at 50+% CPU utilization. Check out the following article on how to remedy this issue.  It worked for me and I’m enjoying much better battery life. Link to CNET (external) article. -shaun