Skip to main content

Best Practices for VLAN Design

Following these General Best practices when implementing VLANs can help to design and implement VLANs in a simple, secure and less troubleshooting-requiring Campus Network.
  • For the Local VLANs model, it is usually recommended to have only one to three VLANs per access module and limit those VLANs to a couple of access switches and the distribution switches.
  • Avoid using VLAN 1 as the “blackhole” for all unused ports. Use any other VLAN except 1 to assign all the unused ports to it.
  • Try to always have separate voice VLANs, data VLANs, management VLANs, native VLANs, blackhole VLANs, and default VLANs (VLAN 1).
  • In the local VLANs model, avoid VTP; it is feasible to use manually allowed VLANs in a network on trunks.
  • For trunk ports, turn off DTP and configure it manually. Use IEEE 802.1Q rather than ISL because it has better support for QoS and is a standard protocol.
  • Manually configure access ports that are not specifically intended for a trunk link.
  • Prevent all data traffic from VLAN 1; only permit control protocols to run on VLAN 1 (DTP, VTP, STP BPDUs, PAgP, LACP, CDP, and such.).
  • Avoid using Telnet because of security risks; enable SSH support on management VLANs.

Popular posts from this blog

How to check Gray-log current running version

If you planning to upgrade your graylog and want to see what your graylog current version is, here is how you can check it. Go to the Graylog Web Interface Click on System/Nodes Under System/Nodes --- Click on the N odes  Scroll down to the ' System ' Here you can see the current version of your graylog server

How to import Putty Saved Connections to mRemoteNG

Just started using mRemoteNG and its being very cool to connect to different remote connection with different protocols e.g Window Remote Desktop, VNC to Linux, SSH, HTTP connection etc. from a single application. As new user I configured some remote desktop connection which was quite easy to figure out. But when I wanted to add SSH connections, it came in my mind to import all of the saved connections in the putty. But I couldn't figure it out how can it be done, though it was quite easy and here are the steps. Open your mRemoteNG Create a folder if you want segregation of multiple networks Create a new connection Enter the IP address of remote server under connection in Config pane Under the config pane, select protocol " SSH version 2 ".  Once you select protocol to SSH version 2 you are given option to import putty sessions, as shown in the snap below. In the above snap, I have imported CSR-AWS session from my saved sessions in Putty.

Connection control operation failed for disk 'ide1:0'

I was getting this error while removing Operating System ISO image mounted on the Virtual Machine. What worked for me, is 1. Uncheck the "Connected and Connect at power on" from Device Status. 2. Then Change the Device type from " Datastore ISO File to Client Device " Radio Button 3. and press OK to save the changes. Note:- I was able to remove the mounted ISO only by directly logging to the ESXi at https://esxi-ip-address/ui where it asks "The guest operating system has locked the CD-ROM door and is probably using the CD-ROM, which can prevent the guest from recognizing media changes. If possible, eject the CD-ROM from inside the guest before disconnecting. Disconnect anyway and override the lock?" You need to select yes to eject the CD-ROM and then remove the ISO file successfully.