Monday, March 4, 2019

Cisco recommended IOS randomly adding "voice vlan" to config

Just a warning since I haven't seen it documented in the release notes;

IOS version: 16.3.7

Switch Platform: 3850-12X48U-S double stacked

After the upgrade from 16.3.5b to 16.3.7, all switchport access ports went into err-disable mode. I rebooted the switch, and took off all "switchport port security" and "port security mac address sticky" and it seemed to have resolved the issue. I did notice as well that on random switchports that this displayed "switchport port-security mac-address sticky x.x.x.x voice vlan". I've never had VoIP phones configured and never added in that command myself.



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