Archive for the ‘learning’ Category

Tech Field Day 5 Is Over. Now What?

February 14, 2011 4 comments

I made it back to Nashville before noon on Saturday. A cross country red eye flight with a short layover in Atlanta put me into Nashville just in time. I was able to get a few hours with my kids, dinner with my wife and a bunch of friends from church, followed by dessert and more socializing with all those church friends over at my house. Sunday was full with church, time spent with my father explaining what this San Jose trip was all about(he was very interested in it all), a cub scout hike with my son, and more church. I’m still exhausted. I feel like I haven’t slept in days. I’ve had a nagging cough that air travel made worse and the weather is now 50 degrees warmer than when I left last week to go to California. My co-worker left my company to go work for a well known hardware vendor. His last day was Friday when I was in San Jose. As luck would have it, we had a major data center outage Friday afternoon. I spent the remaining hours in San Jose on the phone and glued to my laptop staring at switch configs. I didn’t get to really say proper goodbyes or even enjoy the final meal with everyone else as I was constantly jumping off and on a conference bridge to deal with the problems in the data center back home. In the end, the problem ended up being something outside of my control, so it was an extra kick in the teeth from the data center gods. In spite of it all, I feel like a million bucks!

Let me tell you why.

1. I love technology. – I love it to the core of my being. There is no greater joy for me than to immerse myself in the 1’s and 0’s of networking and consume mass quantities of information. I’ve never been one to understand people who do what I do for a living and have no real interest in technology outside of 8 to 5 Monday-Friday. Maybe that sounds somewhat elitist. Maybe that’s not a realistic attitude to have. I get paid to learn. That’s the coolest thing in the world. I guess I just recognize that opportunity for what it is and want to be around people who think the same way.

I have been a part of IT groups before where a core group of us had similar attitudes regarding the world of technology. We would feed off of each other and our efficiency and skillsets advanced much faster than all the other environments I have been in where not a whole lot of people shared the same drive and desires. Things change and our careers take us other places. Over time you start to shift back to what is normal for everyone else. You no longer look at Friday afternoon as an inconvenience since you have to put the toys away and go home for 2 days. You no longer wake up Monday morning excited to go into work. For a couple of days last week, I got that spark back.

Now, I don’t want you to think I have a depressing life. I LOVE my life. I love what I do for a living. I love just about everything about my life, and I work in a cubicle! My point, is that I was in the midst of a large group of technology zealots once again. Over the next couple of days, I would either witness or take part in countless discussions regarding networking, storage, virtualization, backups, or systems in general. These were discussions with people who were well versed in their respective areas. People who actually thought about technology as opposed to parroting talking points gleaned from a vendor slide deck. Some of them were published authors. I have a book collecting addiction. Being around authors rates pretty high on my scale of coolness.

2. I love talking to vendors. – My typical exposure to vendors is via their sales channel or third party reseller/integrator. This time, I was able to go straight to the source. I liked the fact that the companies I was exposed to at Tech Field Day 5 ranged from the very large like Symantec and HP, to the very small like Drobo, and Druva. I also saw the companies that fit in between those 2 groups like Xangati, Infoblox, and NetEx. I like talking to the vendors because they all want to differentiate themselves from one another. This means that in general, they have differing points of view as to how to solve a problem. By understanding each vendor’s approach, you can make a more informed decision.

I live on the corporate side of IT. If I make a recommendation in regards to the network, I need to make sure I make the BEST one possible. Yes it takes a lot of time and effort, but choices around hardware and software need to be treated with more care than one uses when selecting which brand of breakfast cereal to buy at the grocery store. I’ll talk to just about any vendor that lives within the network space. No matter how insignificant the product or company may seem, I want to know what it is they do. There is no such thing as being too prepared when it comes to making decisions about your network.

That was Tech Field Day in a nutshell for me. Lots of discussions with my peers and lots of discussions with vendors.  For now, I am still trying to digest it all. Two full days worth of briefings and discussions will take a bit to sink in for me. If anything, I have a sincere desire to shore up my virtualization and storage knowledge. I just have to find the time to fit it in. Networking on its own is enough to keep me busy for years to come!

I met some really great and SMART people at this event. Several of them I already knew from Twitter, and some of them I had read their blogs prior to this event. Others were affiliated with vendors, so I had never heard of them, except for some of the people from the larger companies. My RSS feed list has grown by quite a few entries as a result of this trip.

If I could give any advice in regards to this kind of event, it would be this. Go register to be a Gestalt IT Tech Field Day delegate. Do it NOW. If you love technology, if you love talking about technology, and if you want to mix it up with vendors in their own back yard, this is the event for you. I was taken care of very well by Claire and Steven. Nothing was overlooked. Every single vendor that presented seemed interested in us being there. Nothing was off limits in terms of what you could ask. Of course, there’s no guarantee they are going to answer it. The vendors still have to protect their intellectual property and rightfully so. Never in a million years would I have imagined that I would be able to engage someone like the CEO of Symantec and ask a direct question and get a direct answer. I also wouldn’t have imagined myself ever talking to the CEO and CTO of a company like Druva. I spent at least 15 minutes talking with them about their company, social media, and other similar things at the Computer History Museum. Without a doubt it was one of the high points of my trip to San Jose. I could go on and on about other incidents, but it wasn’t my intention to ramble on in this post.

Oh, and lest I forget to tie into the title of this post I should answer the question: “Now what?” Well, I still have to finish preparing to take the CCIE Route/Switch lab. However, I find myself wanting to give equal time to ramping up in the VMware and storage networking worlds. I spent several days in the midst of some storage and virtualization experts. What can I say? They have made me a convert. Or maybe it’s just that I want to understand a bit more of what they were talking about if I ever run into them again. 🙂 In the near future, I want to write a bit about the various vendors. In particular, I will focus on Xangati, HP, Infoblox, and NetEx. They have more of a network-ish focus and that’s the area I focus on. That’s not to say that I won’t comment on the others. I really enjoyed the data deduplication talk from Symantec!

I cannot say thank you enough to everyone who made this event possible. Stephen Foskett played the role of our fearless leader very well. Claire was the driving force behind the scenes making sure everything went off without a hitch. The audio/visual crew produced some very high quality stuff even in the face of several technological glitches. The vendors were very gracious in hosting all of us. I appreciate their interaction from the presentation standpoint as well as their active Twitter presence. Bonus points to Xangati for the bacon and chocolate espresso beans! As for the delegates, well I am humbled to have been among you. Some of you are used to interfacing with these companies at this level. I personally, am not. I do look forward to reading your writings and hope to run into you again at some point!

As a Tech Field Day delegate for Gestalt IT, my flights, hotel room, food, and transportation were provided by all of the vendors that presented during this event. This was not provided in exchange for any type of publicity on my part. I am not required to write about any of the presentations or vendors. I received a few “souveniers” from the vendors which were limited to t-shirts, water bottles, pens, flash drives, notepads, and bottle openers.

Be A Part Of History

January 27, 2011 Leave a comment

Henry V - Image courtesy of Wikipedia

He that outlives this day, and comes safe home,
Will stand a tip-toe when this day is nam’d,
And rouse him at the name of Crispian.
He that shall live this day, and see old age,
Will yearly on the vigil feast his neighbours,
And say ‘To-morrow is Saint Crispian.’
Then will he strip his sleeve and show his scars,
And say ‘These wounds I had on Crispian’s day.’
Old men forget; yet all shall be forgot,
But he’ll remember, with advantages,
What feats he did that day. Then shall our names,
Familiar in his mouth as household words-
Harry the King, Bedford and Exeter,
Warwick and Talbot, Salisbury and Gloucester-
Be in their flowing cups freshly rememb’red.
This story shall the good man teach his son;
And Crispin Crispian shall ne’er go by,
From this day to the ending of the world,
But we in it shall be remembered-
We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother; be he ne’er so vile,
This day shall gentle his condition;
And gentlemen in England now-a-bed
Shall think themselves accurs’d they were not here,
And hold their manhoods cheap whiles any speaks
That fought with us upon Saint Crispin’s day.

Such are the words that William Shakespeare penned in “Henry the Fifth”. They come from the Saint Crispin’s Day Speech that King Henry V gave prior to the battle of Agincourt in 1415 where the English defeated the French and King Henry ended up with a French princess named Catherine as one of the spoils of war. Although the speech from Shakespeare is made up, it is still a beautiful combination of words that express the pride the English soldiers would feel in the years after the battle. Others might forget what went on, but the soldiers would never forget. They would be a part of history. Which brings me to the point of this post……

The other day Jeremy Stretch mentioned this on Twitter:

“regardless of your thoughts on IPv6 adoption, it’s a pretty interesting time to be a networker”

That’s putting it mildly and it got me thinking about the changes going on in networking these days.

1. IPv6 Transition – Certainly you have heard of IPv6 and the coming IPv4 address exhaustion. If not, you need to get out more.

2. Virtual Networking – With the explosion of vmWare and other virtualization vendors in the past several years, a fair amount of traffic is cruising around “virtual” switches inside physical servers. Guess what? You still have to manage it. You still have to secure it.

3. Wireless Explosion – Everything is wireless today. Cameras, printers, phones, tablets, laptops, and other wireless capable devices are growing in number each year. If you aren’t familiar with wireless, you better be soon.

There’s more. Storage traffic riding over the same wire as voice, video, and data. How about link encryption on your internal switch/router infrastructure? Don’t forget the rush to flatten datacenter networks to L2 courtesy of TRILL or each vendor’s implementation of it.

Some difficult and interesting days lie ahead. Difficult and interesting from the standpoint that we’ll have to implement things that we haven’t been doing for years and years. This is new ground for many of us. With the right amount of due diligence and a couple of heavily padded blocks of time from various consultants, it will all get done. Fast forward to a few years down the road. Like King Henry said in Henry V:

Then will he strip his sleeve and show his scars,
And say ‘These wounds I had on Crispian’s day.’
Old men forget; yet all shall be forgot,
But he’ll remember, with advantages,
What feats he did that day.


And gentlemen in England now-a-bed
Shall think themselves accurs’d they were not here,
And hold their manhoods cheap whiles any speaks
That fought with us upon Saint Crispin’s day.

We’ll all have scars, but they’ll be scars we can be proud of. This is an interesting time to be in networking, but I wouldn’t want it any other way. I foresee changes like these flushing out people who are not ready for the paradigm shifts that are coming or are already here.

New blood will come into the field. You’ll be able to guide them and mentor them and show them your scars from the IPv4, every server was physical, no wireless, TDM PBX, Frame Relay was king days. Then, they’ll produce a fake smile as you bore them with stories of how many CAT5 patch cables you have made in your past career and then they’ll mock you when you’re not around. Kind of like how we mock Thomas Watson and his inability to predict the demand for computers.

Categories: career, learning

Tech Field Day 5

January 19, 2011 2 comments

Tech Field Day

I’ve been fortunate to receive an invite to Tech Field Day 5 out in San Jose, California. The event takes place in February and will bring IT vendors and technical people together to talk about products from the various vendors and their particular vision or strategy for the part of the IT market that they do business in. That’s a nice way of saying that a bunch of people get together to geek out for a few days. While most IT professionals can listen to a variety of vendors talk about their products via the usual sales channels, events like this allow people like myself to visit the vendor on their home turf and ask all kinds different questions in a more relaxed setting.

You can read more about Tech Field Day here.

This particular Tech Field Day will be focused on the datacenter. Considering the bulk of my work focuses around the data center, I cannot stress enough how excited I am to take part in this. This will be a great chance to not only talk directly to vendors like Infoblox and Symantec, but to talk to other IT professionals who bring their own opinions and viewpoints to the table. Since I focus on the network side of the house, it will be great to spend some time with people who focus on virtualization, storage, and the systems side of things.

I plan on writing about my experiences at Tech Field Day 5 and will be active on Twitter as well during my time in San Jose. And of course, in the interest of being completely open and honest:

My travel and living expenses are being covered by the various corporate sponsors. However, I am under no obligation to write anything about the event, and if I do, I am not obligated to make it a positive article. Additionally, there may be some things I hear that are not generally released to the public yet, so I won’t speak about those things until the vendor makes them public.

Categories: career, learning, vendors Tags:

Dealing With Knowledge Gaps

January 6, 2011 2 comments

Inevitably, we are all going to come across things in our jobs that we are deficient in. Maybe we know a little about a certain topic, but we need to know more. Maybe we know absolutely nothing and need a basic introduction to the topic. Regardless, there will come a time in which we need to increase our knowledge and understanding of something in this ever growing world of networking or just IT in general.

The problem as I see it, is how I go about filling in those gaps. When you just start out in the IT world, you may not have a good methodology in which to learn about IT things. If you have been in the industry for a long time, you may already have a good system that works for you. No matter which category you fall into, the fact that you will constantly have to learn is unavoidable. There are NO exceptions to this rule. If you wish to be at the top of your game in IT from a technical standpoint, you must make a habit of constantly learning new things. Failure to do so means that your knowledge will become dated and you will drift off into obscurity working as some corporate slave in a dark and dreary cubicle. This may or may not involve working for the government. 🙂

Now that we have established that static knowledge is a dead end, let’s look at how to ensure we are always at the top of our game. I offer you the 5 step plan. Others have 12 step programs. Maybe some have less. I only have 5. I am all about efficiency…..and my program doesn’t cost you a dime.

1. Examine your current level of knowledge. – How much do you already know about the subject in question? The answer to that question is going to dictate the kind of resources you use. Let’s use BGP for example. If you need to learn about the basics of it, there are a few good books that can handle that. There are also plenty of websites with white papers and blog posts that give a generic overview of BGP. There are some classes out there that will accomplish the same thing. However, there are quite a few books and white papers that will completely blow your mind if you don’t already have a decent understanding of BGP. The service provider side of BGP comes to mind. Enterprises and service providers use BGP in VERY different ways.

2. Find out where the information is. – For starters, you need to identify what kind of learner you are. Some of us are visual learners. Some of us are audible learners. Some of us learn by doing. Perhaps you are a mix of several different methods. Only you know what works best for you. If you need a lot of pictures and the topic is relatively mainstream, maybe a visual CBT(computer based training) course is what you need. If that is the case, I highly recommend you check out CBT Nuggets. If what you are looking for is somewhat more obscure, then I would recommend asking other people who do what you do. There are a variety of resources in which you can ask these questions like LinkedIn, forums, or Twitter. I prefer Twitter because it is a lot quicker. The only possible problem would be having enough people see the request. If you are new to Twitter, or very rarely use it, you may not have many followers who would see your message. Feel free to engage others in a substantive manner and over time your followers will grow. If all you do is tell everyone what you ate for lunch or what the weather is like in your part of the world, you probably aren’t going to get anywhere. If you absolutely refuse to use something like Twitter, then consider posting on Cisco’s forums if your issue is of a Cisco nature or There are other forums out there as well as mailing lists(NANOG comes to mind). All of the major vendors have support forums as well. Keep in mind that you may have to sift through tons of information before you finally find the information you are looking for. There is not always going to be a technical paper or book that explains exactly what you are looking for. Sometimes you have to piece it together from multiple sources. Actually, I would recommend that you use multiple sources unless it is some vendor specific thing that you can only get in one place. I have found out that you cannot trust a single source for 100% accuracy. Not that all sources are wrong, but imperfect human beings write books, white papers, and blog posts. Other imperfect human beings double check these same sources. When the content is of a technical nature, things get missed. This is especially true for the deeper technical things.

3. Execute. – You have all of the appropriate resources identified. Now you just need to get that information into your head. There are no shortcuts. While I wish I could learn kung-fu like Neo did in The Matrix, it isn’t going to happen. You have to put in the time required to absorb all of that information. Sometimes it can be done in a matter of minutes. Sometimes it takes weeks.

4. Ignore any distractions. – In the course of your learning, you are bound to come across something else that is interesting or neat. Resist the temptation to get sidetracked and stay focused on the main thing you are trying to learn. If you want to go back at another time and research the other items that pop up, then make a note of them. By focusing on the main thing you are trying to learn, you have a better chance of retaining information then if you start going in 100 different directions with every new thing that appears.

5. Allow the information to digest. – Sometimes it helps to simply think about things. Just go over it in your head. I tend to do this in conjunction with step 3. If I need to absorb a large amount of information, I like to take it in pieces and digest it little by little. By stopping to sort things out in your head, you can really come to terms with what makes sense and what doesn’t. I am very thankful my current employer allows me the freedom to do this. While it may look like I am spacing out on any given day in my cubicle, lots of times I am just thinking about something I just read or watched. It’s my way of performing a “write memory” on my brain. One of the other things I will do is drive to and from work in complete silence. That really helps because all I have to focus on is not crashing the car, which is relatively simple.

**Note – When asking others about a certain technology or product, do yourself a favor and research it first. Try and figure some things out on your own. This isn’t so much a problem with people who have been in the industry for a number of years as it is with those who have only been in IT for a few years or less. It’s not that people don’t want to answer the question. There will always be someone who will just blurt out an answer. The issue with asking without having done any research on your own is that you miss out on a great opportunity to develop your own research methods. There’s a reason that was created and is often quoted on Twitter. It has been my experience that those who last in IT are the ones that only need a nudge in the right direction. They don’t want their hand held. They just want a sanity check every now and then. The people who never want to put in the time or effort to figure something out and habitually want you to solve their problems are the ones that won’t make it in the long run. Well, they might have a job, but they won’t be anywhere near what they could be if they put forth some effort.

I am not going to make the bold claim that the 5 steps I laid out will work for everyone. They work for me when I follow them, and I don’t always follow them. I find the instances in which I have tried to cram something new into my head without following these steps ends badly. I forget something and have to start all over again. When I take the time to really dig into something and not rush it, it tends to stay with me at least from a conceptual point of view.

Chasing the “Ah-ha!” Moments

December 20, 2010 9 comments

Image courtesy of Wikipedia

Whenever I talk to people who are just getting started in networking, there’s a part of me that wishes I was in their shoes. I say that because I know several of the things they are going to learn or figure out in the next couple of years and I remember having to go through the same process. Before I understood variable length subnet masks(VLSM), the numbers in the subnet mask field of a workstation’s TCP/IP settings didn’t really mean a whole lot to me. If someone used slash notation(ie /24, /16, /27), I had no idea what that meant. Like a lot of people, I relied on someone to tell me what the subnet mask was. However, once I learned about VLSM, it was as if a whole new world opened up. That was one of my absolute favorite “Ah-ha!” moments. You’ve had those yourself haven’t you? It is the point in time in which a certain technical concept just clicks in your head. You go from not really understanding it, to comprehending it. In fact, it’s almost as if that concept is only represented in binary inside your head. You go from a 0 to a 1 with no in between.

As you progress along in networking, more and more of these “Ah-ha” moments come. Unfortunately, over time they become fewer and fewer. That’s not to say that they go away completely. They don’t. They are just harder to come by. I’ve found that I am able to keep a steady stream of these “Ah-ha” moments coming as long as I look at technology without taking anything for granted. What I mean by that is that I don’t assume anything when it comes to trying to understand a protocol or technology. What I “think” I know might actually be wrong. My understanding might only be partial. I have to continually ask “why/what/how/when/where” when dealing with technology.

Let me give you a personal example. I have known for many years that a T-1 is 1.544Mbps in terms of bandwidth. It is comprised of 24 64kb channels. The only problem is that 24×64,000 is 1536000 and not 1544000. Oops. Where did the other 8k go? To further drive this home, a “show interface” on a serial link that is configured as a full T-1 shows the interface bandwidth to be 1536kbps. Why the discrepancy? I could have just moved on and ignored the reason behind the discrepancy. However, by researching the issue and figuring out what the issue with this discrepancy was, I learned a whole lot more about T-1’s. I learned how alarms over the circuit get propagated. I learned what the extended super frame(ESF) actually was. In other words, had I not been curious as to why the math didn’t add up when it came to T-1 bandwidth, I would be far more deficient in the inner workings of the T-1.

In the spirit of chasing the “Ah-ha” moments, take a look at the 4 questions below. Go find the answers if you don’t already know them.

1. Why is MPLS faster than conventional IP based routing?
2. What are the differences between a multi-layer switch and a router?
3. Why do you need different antennas for wireless access points and where would you use each antenna type? Sure, this is rather open ended, but what I am getting at is the radiation pattern of each antenna.
4. How does traceroute really work? Not just the TTL mechanics, but look at the various ICMP type codes as well.

Can you remember the last “Ah-ha” moment you had? If not, why? If so, does it make you want to go out and find more of those moments?

The Many Hats of the Network Engineer

November 18, 2010 8 comments

Remember when the network field wasn’t so complicated? Think back to the early 1990’s. Wireless for enterprise users was in its infancy. Firewalls seemed to be a bit easier to administer. Virtualization was limited to the mainframe community. A T-1/E-1 cost a billion dollars a month and could provide Internet connectivity for thousands of users. Voice was still confined to its own cable plant and the PBX was humming along using TDM. RIPv1 was still pretty popular. Hubs made packet captures easy to obtain, but broadcast storms constantly took down segments of the network. Storage involved connecting an external disk array to a server via a SCSI cable. ISDN was what the rich people used at home for Internet access. You know. The good old days.

Well it seems that a lot has changed since then. While I have no desire to go back to those days, I do miss the simplicity. Or at least what seems simplistic compared to today. Let’s take a look at what your typical enterprise network person has on their plate. Keep in mind that in some environments, these people also have systems related duties such as Active Directory administration, Linux/Unix administration, e-mail, database, etc.

Routing – Static, OSPF, EIGRP, and BGP

Switching – STP and its variants(RST, MST, PVST), Link aggregation(port channels/etherchannels)

Wireless – AP’s(antenna types), controllers, extras(location services, management), 802.11a/b/g/n

Circuits/WAN – T-1’s, DS-3’s/T-3’s, OC-3/12/48(SONET), Metro Ethernet, ISDN(Yes, it’s still out there), FrameRelay(Yep. That one too.), MPLS

Voice – call routing, phone(station) administration, voice mail, conferencing(audio and video), PRI’s, DID’s, signaling, codecs, voice gateways

Other Services – Multicast, load balancing, firewall, IPS, VPN, WAN optimization, content filters(web,e-mail), network management platforms, QoS, packet capture analysis(ie Wireshark,tcpdump), storage networking

Does that about sum it up? Yes, some of those things were being done back in the 90’s and in some cases, even earlier. However, a lot of them are relatively new things. Maybe you don’t have to touch all of those things. Maybe you do. For some of the service provider type things (MPLS, SONET), you may not ever have to administer that end, but if you’re buying those services, you better be familiar with them. Perhaps your organization is large enough to break out the security side of things or the voice side of things. Maybe you have a dedicated storage group that handles the storage network side. If you are lucky, you may even have a dedicated wireless engineer or two depending on the size of your wireless deployment.

It is a monumental task to become proficient in all of those areas, but wait; there’s more. For many people in the network space, they also have to become data center/facility engineers focusing on the following things:

Monitoring – temperature, humidity, water leak, smoke, power load levels

Cooling – BTU calculations, hot/cold aisle design, airflow on hardware

Power – Circuit requirements, UPS requirements, generator requirements

Cabling – Sub-floor, above the rack, CAT-5/6/7 differences, patch panel choices/locations, SM and MM fiber differences

Space Requirements – Rack deployments, 2 post, 4 post, full height, half height

Think that’s all? Well, the past few years have added some additional requirements, and more are coming. Things such as:

Virtualization – It has been around for at least 5 years now in enterprise environments. It’s not going away and without using newer hardware/software from networking vendors, you can’t see what’s going on inside the server farm.

The Return to Layer 2 in the DC – TRILL and every vendor’s particular flavor of it aim to resolve the ineffiencies of Spanning Tree and turn your network switches into an intelligent fabric. This will be similar to what storage networks have today via Fiber Channel.

Consolidation of Storage and Data/Voice Traffic – It happened to voice about 10 years ago. Now it is happening to storage. Everything will be on 1 wire in a matter of years.

Traditional Endpoint Death – No longer will the phone, desktop, and laptop rule the network. Cellular phones, tablets, and other similar compact devices will show up on the wireless networks in even greater numbers than they are today. Congratulations corporate wireless person. You just become a Google, Apple, Microsoft, Blackberry, HP, Cisco, and Avaya engineer for their mobile product set.

IPv6 – And you thought planning IPv4 deployments were interesting? The migrations to IPv6 are going to be interesting. Using NAT and 6to4/4to6 tunnels will become commonplace until the IPv4 is gone. I realize this is already happening/happened in many other parts of the world. However, in the US, there’s still a LOT of work to be done.

Now I realize that nobody is going to be an expert in all of these areas. I also know that many employers are not going to require you to even be familiar with all of these things. With things like hosted data centers, you may not ever have to deal with data center build out. Power and cooling may never be an issue for you. I also know that there are plenty of good consultants out there that specialize in one or more of these areas. Of course, nobody stays at the same company forever, so what you do at company X today doesn’t mean you won’t do a bunch of other things at company Z tomorrow. I guess the point I am trying to make is that our jobs are only going to become more complex in the years to come. The amount of hardware we use may decrease, but the functions within that hardware will increase. I can see a day in which something like WAN optimization is built into the router itself, and I don’t mean via a service module. I mean built into the processors or ASIC’s themselves. Of course, that’s assuming we’re still using TCP at that time. I don’t even want to contemplate what wireless will be like after 802.11n because it makes my head hurt just trying to understand how 802.11n works today with multiple antennas.

Start looking at the blueprint for something like a Cisco CCIE Route/Switch(Insert any other track as well) or Juniper JNCIE exam and you’ll find that it only covers a portion of what you need to know in this day and age. Anyone who has been involved in that process from start to finish knows how much information you have to know to pass. For those who don’t know, it is a TON. Yikes! Still want the job? Maybe becoming a specialist isn’t such a bad idea after all.

ACE Boot Camp – Days 3 and 4

September 28, 2010 Leave a comment

Days 3 and 4 did not disappoint! I don’t know if I stated this in the earlier posts, but the days basically consisted of lecture in the morning and labs after lunch. I REALLY, REALLY enjoyed the lecture portion. Again, I have to state that the instructor was fairly knowledgeable in regards to ACE, so he was able to actually teach instead of regurgitate a slide deck like other classes I have been in. That makes all the difference in the world. As for the labs, I guess they do some good if you have not had much experience with the ACE CLI. We did not do any labs using the built in GUI or ANM. The problem I have with labs is that they are a very canned and controlled environment. You end up just going through the motions without actually soaking up what it is that you are doing. Ideally, the labs would need to be tailored to your environment to have the greatest effect. This of course, is not realistic. Having said that, I am sure there are some people who get something out of it. My opinion was shared by others in the class in regards to the effectiveness of the labs, so I am not the only one who feels this way. However, the effectiveness of the lecture portion completely overshadowed any shortcomings of the lab portion.

In the interest of brevity, I am going to touch on the things I thought were the most interesting, but I don’t want this post to be so long it requires a coffee break to finish.

Route Health Injection – On a simplistic level, RHI allows the ACE to inject a host route into the network. You would use this to advertise the VIP(virtual IP) that clients use to connect to a server farm. If the server farm is not available due any number of issues, the host route can be automatically removed from the route table and not advertised. The alternative is to simply advertise the VIP’s as part of a regular subnet advertisement like you do with any other VLAN or subnet. Again, I am simplifying this and need to point out that this is NOT something that is specific to Cisco ACE. Other vendors implement similar technologies.

KeepAlive-Appliance Protocol(KAL-AP) – There’s a few variations of the Cisco ACE, and one of those is the Global Site Selector(GSS). Its purpose is simply to provide higher level load balancing between data centers. Basically, it is a load balancer of load balancers. By using KAL-AP, the GSS can query VIP’s at multiple data centers and determine which one is the best fit to send traffic to.

There are a couple of things that the ACE 4710 appliance does that the ACE module cannot. I asked the question as to why this is the case and was told that the ACE appliance has different architecture than the module. It has certain functionality that might come to the module at some point, but for now is restricted to the appliance. These extra functions really revolve around the ACE appliance being able to cache certain HTTP objects and speeding up the process of delivering a web page to an end user. A fair amount of detail on this can be found here.

It sure seems as if I cut back on the information from days 3 and 4 when compared to 1 and 2. I did. Although there were plenty of interesting things covered in the past 2 days of class, a lot of those things would take a while to explain and draw out via diagrams. That’s also assuming that I actually understand these things well enough to explain them in depth.

That brings to me to a more philosophical point in regards to the type of niche product that Cisco ACE is. While it would be great if you knew the CLI on ACE backwards and forwards, it really isn’t necessary. What is necessary is an understanding of what a platform like ACE is capable of. I sat in a meeting today in which some developers wanted ACE to perform health checks on a server outside of a load balance pool and use the results of that query to determine whether or not servers should be removed from a load balance pool. Basically, they wanted to do something that ACE is not really designed to do. Spending 4 days in a classroom learning all about ACE gave me the information needed to have a productive meeting with these developers today. I was able to answer their questions and give better guidance than I would have a couple of weeks ago. I don’t know all the commands for ACE. I will still have to use the configuration guides to look things up now and again. The important thing is that I understand the capabilities and limitations of the ACE load balancer a lot better today than I did prior to taking the ACE class. My main goal is to know what it can and cannot do in order to design anything requiring load balancing properly. To me that is more important than memorizing commands.

Categories: ace, cisco, learning, load balancing Tags: , ,