OpenFlow Overview and Videos

OpenFlow has really gotten the buzz over the last 12-18 months. More and more companies and customers are not only getting bit by the bug, but they are loving it. For me, I am VERY interested in it. On the up-side, you can do unique things with the network, that has never been done before...Solving challenges that used to be botchy hacks and tweaks to current protocol configurations.  Perhaps the disadvantage is, it can create un-necessary complexity if not carefully thought out. It captures my 3 most greatest passions: Networking: Routing, switching, load-balancing… Everything t...
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Peak10 Nashville Expansion and DR

Peak10 Datacenter is expanding it's Nashville co-location again.  Currently, they have 2 locations in Nashville, so called NAS1 and NAS2.  Together, they create approximately 25,000 square-feet of 24/7 access to cooling, storage, and co-location data services.  Their new expansion will add an additional 15,000 square-feet of datacenter goodness to Nashville, bringing Peak10 to a total of approximately 40,000+ square-foot footprint. It's no secret how I feel about Peak10, and their superb customer service and technical talent, as mentioned in a previous post.  And when I...
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HP fills the Top of Rack switch gap with 5900 switches

  HP has finally filled in the dark void in their networking product lines.  They have the datacenter and campus level switches, but hasn't had an offering in the Top-of-Rack product space, until now.  On Wednesday, HP unveiled the 5900 series switches aimed directly to top-of-rack uses.   The 5900 is a high-density 24- or 48-port 10Gb switch.  The 48-port switch (5900AF) also includes 4 x 40Gb interfaces for demanding applications, and also supports the new IRF (Intelligent Resilient Framework) specification allowing up to 4 5900's to be managed as a s...
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HP Delivers Stacking for 3800 Switches

  I was recently shown the HP 3800 switches, and their stacking technology.  The 3800-series are gigabit switches with 24 and 48 port models with PoE and 10Gb/SFP uplinks.   What is unique about these switches, is that not only do they support up to 5 fully meshed switches, but HP claims to have larger thoroughput with each link over Juniper and Cisco's line.  For example, Cisco claims to have 16Gbps bi-directionally through each port, giving total bandwidth up to 32Gbps across the stack.  Juniper claims to have 32Gbps per port, with a total bandwidth of 64...
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Cisco – ip default-route VS ip route

ip default-route vs ip route Ran into a small problem yesterday, where a sub-contractor dispatched a technician to provision a new DSL line (on a Cisco 851) for me at one of our retail stores. It really was not a huge change. Mostly, just changing the ip address and default route. After 3 hours, the technician calls me back saying it’s not working, and if I gave him the right information. Not arguing, seeing as how I can screw-up a mechanical pencil, I check my information, and all seems right. I webex into his laptop, and requested him to console to the router. After doing a &ls...
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Is Cisco Losing in Switching/Routing?

I'll start off by saying, I'm not an analyst.  I'm not going to quote or link you to analytical articles or mention Gartner's Quadrants (oh crap, I just did!).  What I am going to write about, is my personal opinions on where Cisco is going with their data networking in the enterprise, and why.  I do make many generalizations in this post, so please comment on your thoughts. First off, 4 years ago, Cisco was number 1 in any kind of enterprise switching and routing market (for the most part).  Even though there were other vendors in the industry, you boug...
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The ASA version of PIX ‘alias’ command

I finally figured out, albeit late, on how to do the old "PIX" 'alias' command on a Cisco ASA. For those that remembered, the 'ALIAS' command would basically do a DNS rewrite.  If you have a webserver on your DMZ with a static ip on an outside address, your internal users wouldn't be able to access it.  DNS would return your outside IP, but because the address is on the outside interface, your users are coming in on an inside interface, and it wouldn't access it. So, you would use the 'alias' command to basically tell the PIX to "rewrite" the DNS response address to the DMZ add...
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How I use Juniper 4200 for Servers

I love my Juniper switches.  I've been using Cisco for years, but the Junos system just rocks.  Add to that, their Virtual Chassis system, and I've been very pleased on the results.  I wanted to put together a quick post on how I use the 4200's in a server environment.  See the image for reference:   Basically, because each switch is connected via "Virtual Chassis", they operate as a single switch.  So, for each of my VMWare hosts, or physical servers, I build a link aggregation (some call it teaming, etherchannel, or 802.3ad) to different switches.  Beca...
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Accessing Cisco ASA using SSH

So, I purchased a Cisco ASA 5505 to build a VPN Tunnel from a remote office to my main office. Really simple to do, when you are using Easy VPN . Anyway, I wanted to turn on SSH. So, I enabled SSH on the ASA, and tried to access it: [apaxson@netutil ~]$ ssh -l username 1.2.3.4 ssh_exchange_identification: Connection closed by remote host   Hmmmm..... let's do a debug, and see what happens: asa# debug ssh Device ssh opened successfully. SSH0: SSH client: IP = '1.2.3.10' interface # = 1 SSH: unable to retrieve default host public key. Please create a defauth RSA key pair ...
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