networking

Javier Solis

4 minute read

In my previous role, I had the opportunity to wear many hats, including Network Administrator. Our go-to networking vendor before I moved on was Extreme Networks. When I initially started my position, the campus was a Cabletron customer, then Enterasys, and lastly, Extreme Networks (Believe it or not, there’s more than one way when it comes to Network Vendor selection). Now the transitions did come upon company acquisitions. And after each acquisition, we did our due diligence and reviewed…

Javier Solis

4 minute read

You’re probably thinking why are we still talking about NAC? In my opinion, NAC is one of the bests ways to apply dynamic assignment of access control and gain visibility to where devices are connected to the network in real-time in an agent-less fashion. By the way, us networking folks hate agents. We don’t want to be in charge of one more application, especially if its deployed on thousands of machines.

Javier Solis

3 minute read

I recently attended a CWNA course taught by none other than Devin Akin, wireless guru and co-founder of CWNP. During the course I was reminded about how attenuation can become your best friend when building high density Wi-Fi networks.

Javier Solis

2 minute read

I came across a scenario where a user had two data centers in different locations connecting back to the same ISP via BGP. These two data centers would be advertising a unique /24 at each site. However, the user also wanted to advertise the other DC’s /24, but not in an active state for failover. Being that the user was connecting back to the same provider AS, I decided to test using the BGP MED (Multi Exit Discriminator) attribute to determine which /24 would be the preferred route from the…

Javier Solis

5 minute read

As a systems engineer for Extreme Networks, I like to get as much hands-on lab gear that I can within a reasonable budget. I have quite a large lab setup at home as you can see.

Javier Solis

5 minute read

If you make your way into the world of networking, you’re bound to come across a decision path on how you should handle network expansion. Should your default method always be to extend or stretch your layer 2 bridge domain? The root of the answer can be found when discussing the why. Let’s take a look at some of the use cases I’ve come across within enterprise network environments: Device Requirement Device “A” needs to communicate with device “B” and those two devices are “required” to live on…

Javier Solis

3 minute read

We recently upgraded some of our WAN link bandwidth capacity from 1Gbps to 10Gbps to decrease transfer rates of backups across our two data centers. Traffic between each site encrypts with Checkpoint physical open appliances. The upgrade to the WAN links involved installing 10Gbps Intel NICs in our Checkpoint open servers. Once all the pieces were in place, I started to test everything using iperf3.

Javier Solis

3 minute read

Some of my most visited posts seem to be on brocade switching configuration/commands, so I decided to put together our standard list of commands for some Extreme Networks switches we use. These commands can be used on the B5, C5, K series, 7100 series, and S Series Extreme Networks switches. These switches run the EOS network operating system. Extreme networks product line moving forward will be purely EXOS (ExtremeXOS operating system). Therefore the following commands will become legacy, but…

Javier Solis

3 minute read

We recently starting having issues with a building reporting that icmp stopped responding on a distribution router and some access switches behind the router. Some routing interfaces would respond, but the management VLAN interface wouldn’t. Further troubleshooting showed that the CPU processes on the router comprised of two Extreme Networks 7100 series switching running OSPF climbed up to 80100% utilization. The “show logging buffer” revealed massive amounts of host-dos ARP attack…

Javier Solis

3 minute read

Being a network administrator/engineer typically requires typing in ssh consoles to get things going. At some point, being able to automate tasks or being able to manipulate configurations based on a certain outcome will become necessary. I’ve gathered a few thoughts on real world views to network automation. The buzzword floating around for this topic is NetDevOps.