Day 17 CCNP ENCOR: Can I Build a Collapsed Core With Only Trunks and EtherChannel?

CCNP ENCOR 350-401 v1.2 study with me, Day 17: Saturday lab day for Chapter 5, live in Cisco CML from 5:00 to 8:00 AM Pacific. A small collapsed-core campus: two core switches in the MDF and two closet switches, each closet uplinked to both cores, built from factory defaults. First the trunks: DTP modes, 802.1Q vs ISL, native and allowed VLAN mismatches, and turning DTP off the way production does. Then EtherChannel: an LACP core interlink and PAgP and static closet uplinks, what breaks when members don't match, max links, port and system priority, load balancing, and what happens when a link fails. Monday to Friday 5:00 to about 6:10 AM: 40 minutes reading the Official Cert Guide live, then 20 minutes of lab on what I just read. No exam date until the practice tests say I'm ready. 💬 Study between streams: ask in the chat or comments for an invite to the Network Study Hall Discord. 📋 Board (every session is an issue): https://github.com/users/baltejgiri/p... 💾 Schedule, tracker, labs: https://github.com/baltejgiri/project... ▶️ Playlist:    • Study With Me (CCNP ENCOR)   Music: YouTube Audio Library 0:00 Hello and today's plan 3:44 The job, topology and the trunk standard 14:59 Task 1: VLANs on all four switches 21:29 Task 2: Out of the box, auto + auto 26:59 Tasks 3-4: DTP desirable, n-isl vs 802.1Q 43:59 Tasks 5-6: Static trunk vs auto, DTP off on one side 1:01:56 Task 7: Applying the trunk standard 1:24:29 Tasks 8, 9, 11: Native and allowed VLAN mismatch, nonegotiate 1:40:59 EtherChannel: Building Po1 (LACP), Po13 (PAgP), Po24 (static) 1:56:56 LACP and PAgP neighbors, the STP view 2:06:59 Both sides passive: Po1 goes down 2:14:29 Member mismatch on an LACP bundle 2:22:59 Member mismatch on a static bundle 2:31:59 Max links: lacp max-bundle 2 2:43:59 Choosing the standby link: port and system priority 2:49:59 Wrap-up #ccnp #ccnpencor #studywithme