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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