The troubleshooting of Layer 2 issues seems like it may be the easiest, as the information is really taught quite thorough at the CCNA level, however there are some caveats that are potential exam landmines for TSHOOT to avoid on exam day! First I want to start with some verification commands that are critical for … Continue reading TSHOOT – Layer 2 troubleshooting of Trunks, VTP, and VLANs!
The above Topology has been configured for the labbing portion of configuring VTP Authentication, I won't go int every detail, but I will bullet point the basics, before reviewing authentication methods to know for exam day + full explanation of VTP Pruning as it can be a tricky topic if you don't know the mechanisms … Continue reading VTP v3 – Review of v1/v2/v3 basics and updates to v3, an in depth look at VTP Pruning and mechanisms that drive it, and VERY important v3 Auth info and concepts to finish up!
Above is the logical Topology of how I cabled / Trunked the switches, and modes they are in, I'll walk through the changes step by step as I introduce the nuke switch. Advertisements / "Subset Advertisements" and Configuration Revision # Now as previously stated, the highest "Configuration Revision #" in a VTP Domain is considered … Continue reading VTP – Intro to Advertisements and Config Revision #, DEEP DIVE into Cisco “VTP synch issue” and Cisco’s official fixes for it – Important!
So from my edit of the last post, SW1 and SW2 at this point are both again in the same VTP Domain, "CCNP" and are indeed exchanging VLAN information. I am sure you saw throughout the lab, that "Server" mode in "sh vtp status" was always on, because that is the default mode for VTP. … Continue reading VTP – Modes explained, behaviors with different versions, old “sh vtp status” vs new, and very important VTP default info for exam day!
After truly resetting all switches so no VLANs exist outside defaults, no trunks are configured, etc I will build the above Topology through this segment (though I may only work on portions and lead up to the it as a whole at the end). Now for those who haven't tested for CCNA recently, VTP is … Continue reading VTP – Is it on by default? IMPORTANT default behaviors, while demonstrating a simple VTP configuration (and breaking it)!