Learn how a layer two switching loop can disrupt a network at best, and completely halt it at worst. Understand some common ways switching loops form. Explore some common methods to mitigate them once they form. Discover how loops may be avoided all together with some advanced switching features.
- [Instructor] Switching loops are the bane…of every Layer Two network,…and will absolutely ruin your day.…If protection mechanisms don't kick in,…you can expect heavy packet loss if you're lucky.…If you aren't lucky, you can expect…every connected switch to become unresponsive.…Most often, a loop will begin…when a user has a free cable connected to a wall port.…For some reason, when a user sees a dangling cable,…they feel the need to plug it in somewhere,…and that can be another open wall port.…
Loops can also be seen from VoIP phones.…Somes phones have an additional ethernet port…allowing users to piggyback their computers…off of the phone.…If this piggyback port is plugged back into the switch,…it can cause a loop.…When connecting switches together,…if multiple ports are connected…and STP or bonding isn't properly configured,…then a loop can occur.…It may sometimes seem that it's easier…to create loops than to prevent them.…I'll first start by saying…don't use unmanaged switches in your network.…
They provide zero visibility for monitoring…
Even if you're rusty on your OSI model knowledge, this course is invaluable if you're having trouble with your network. It offers a clear, practical troubleshooting guide to narrowing down and solving most problems related to network connectivity.
- Troubleshooting the physical layer: POTS, Ethernet, and more
- Troubleshooting the data link layer
- Troubleshooting the network layer
- Troubleshooting the transport layer
- Troubleshooting Wi-Fi
- Troubleshooting proactively