This is the retired Shane Killen personal blog, an IT technical blog about configs and topics related to the Network and Security Engineer working with Cisco, Brocade, Check Point, and Palo Alto and Sonicwall. I hope this blog serves you well. -- May The Lord bless you and keep you. May He shine His face upon you, and bring you peace.
Wednesday, June 15, 2016
Cisco R&S: PortFast Tidbit
Just a real quick post, but did you know that, on a Cisco switch, when you configure a voice vlan on a switchport (switchport voice vlan x), that portfast is enabled automatically? Well, that makes sense if you have ever seen an IP phone boot up. But the thing is that if you take that config off, portfast is still enabled. This can cause you an issue if you happen to plug in a switch or something on that port later. The point is that if you unconfigure a voice vlan on your switch, you need to also disable portfast as well. Just FYI.
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