Configuring Voice VLANs 37 C H A P T E R 3 Prerequisites for Voice VLANs 37 Restrictions for Voice VLANs 37 Information About Voice VLAN 38 Voice VLANs 38 Cisco IP Phone Voice Traffic 38 Cisco IP Phone Data Traffic 38 Voice VLAN Configuration Guidelines 39 How to Configure Voice VLANs 40 Configuring Cisco IP Phone Voice Traffic 40 Configuring the Priority of Incoming Data Frames 42 Monitoring Voice VLAN 43 Where to Go Next 43 Additional References 44 Feature History for Voice VLAN 44 Configuring VLAN Trunks 45 C H A P T E R 4 Information About VLAN Trunks 45 Trunking Overview 45 Trunking Modes 45 Layer 2 Interface Modes 46 Allowed VLANs on a Trunk 46 Load Sharing on Trunk Ports 47 Network Load Sharing Using STP Priorities 47 Network Load Sharing Using STP Path Cost 47 Feature Interactions 47 Prerequisites for VLAN Trunks 48 Restrictions for VLAN Trunks 48 How to Configure VLAN Trunks 49 Configuring an Ethernet Interface as a Trunk Port 49 Configuring a Trunk Port 49 Defining the Allowed VLANs on a Trunk 51 Changing the Pruning-Eligible List 52 Contents VLAN Configuration Guide, Cisco IOS XE 17.16.x (Catalyst 9300 Switches) ix