If I am not mistaken you will need to set it to 3 not 2. I think the reason is when the phone first boots up it thinks it is in the access vlan so with a PC connected as well that takes the 2 allowed. Then when the phone and switch realize it is a phone it tries to add the MAC address for the VoIP side but it has 2 already so it err-disables.
When you enable port security on an interface that is also configured with a voice VLAN, you must set the maximum allowed secure addresses on the port to at least two plus the maximum number of secure addresses allowed on the access VLAN. When the port is connected to a Cisco IP phone, the IP phone requires up to two MAC addresses. The address of the IP phone is learned on the voice VLAN, and it might or might not be learned on the access VLAN. Connecting a PC to the IP phone requires additional MAC addresses.
yes we can do like this but i have noticed if we will allow maximum three and using sticky command.after few seconds access vlan will be associated with 1 mac and data vlan with 1 mac so then i can connect 1 more pc which will allow me to do that as it will allow for 1 more mac .I don't want that thing to happen.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
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