What Cisco switch feature allows IP phones to be automatically placed into a separate VLAN from data traffic?
- private VLANs
- auxiliary VLANs
Auxiliary VLANs allows IP phones to be automatically placed into a separate VLAN from data traffic. The information the phones need regarding this voice VLAN is provided by the switch. This allows the data and voice traffic to use the same physical topology but remain logically separate. The following is an example of the commands that should be executed on the switch to instruct it to provide this information to the IP phone by CDP:
Switch> (enable) set port auxiliaryvlan 2/1-3 222
This command creates the auxiliary VLAN 222 and adds ports 2/1 to 2/3 to the VLAN.
Private VLANs are not used for voice traffic. Private VLANs are secondary VLANs created by an administrator that are not accessible by other secondary VLANs.
Marking is the process of setting the Class of Service (CoS), IP precedence, or DSCP of a packet to a specific value that will provide appropriate QoS throughout the network. It is not involved in separating voice and data traffic.
Auto QoS is a method of configuring commonly used QoS features on a Cisco switch with a single command. It is not involved in separating voice and data traffic.
Layer 2 Technologies
Configure and verify VLANs