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Tag Archives: networking
Power over Ethernet Issues
With the invention of Power over Ethernet (PoE) bringing up light devices such as VOIP phones and wireless access points has become very easy. Power and data flow over the same cable on various wire pairs. The simplicity is great but the electrical requirements are a bit more particular with PoE. With full Gigabit implementations all wire pairs are required for power and for data transmission. When one pair is not properly terminated strange things happen… Continue reading
Layer 2 to Layer 3 Metro-E Link Migration
Metro Ethernet has made connecting different sites extremely easy for just about any level of admin. The problem is, however, it has also made for some very sloppy setups. It is nearly always a recommended best practice to route WAN links. This is particularly true when the WAN is a bottle neck in terms of throughput. If a LAN is built on Gigabit Ethernet and a Metro-E link between sites is only 40Mbps there is a bottleneck. Often LANs in small to medium sized organizations are way underutilized and this can be gotten away with. Typically the Layer 2 connection would span the 40Mbps link with little trouble. However, as traffic increases, a redundant link is added between sites, or requirements change you can find this design corners you with a need for a better way of controlling traffic flow. Continue reading
Study the CCNA for Free
If you are just getting started in networking many people will recommend knocking out the CCNA certification. I would probably agree with that. Personally, when I got the CCNA I had a networking / systems admin job before hand and did just fine without the cert. The CCNA study, however, gave me the opportunity to focus on the material and to expand a bit outside of what I worked with daily. The CCNA is a prerequisite of a lot of other training courses offered on other Cisco technologies as well. The CCNA, or any certification for that matter, can be … Continue reading
802.1Q Tunneling AKA QinQ
You are probably familiar with VLAN tagging on switch trunks and how it can be used to separate physical infrastructures into multiple logical networks. With the explosive growth of Metro Ethernet connections the ability of site to site layer two connections has now become common. It’s easy for organizations to implement as network admins are already familiar with Ethernet as a LAN protocol. The setup is simple for the customer but a bit more configuration is needed on the service provider’s side if the customer desires VLAN tagged traffic to flow over the site to site link. Lets take a look! Continue reading
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