I'm currently going through the CCNA troubleshooting pt 3 video discussing etherchanneling and trunking. In the video it is discussed that etherchanneling doesn't work for trunks when you have 3 switches set-up in a triangle (timestamp 46:15 - 46:45). I'm curious as to why it wouldn't work? It is my understanding you can have up-to 8 ports grouped into various etherchannels, so what would prevent me from grouping up 4 ports (2 trunking channel-groups of 2 ports)? I would appreciate any explanation, or if anyone could point me to appropriate (hopefully online) reading.