Advertising the voice VLAN information to IP phones

Figure 52 shows the workflow of advertising the voice VLAN information to IP phones.

After receiving the voice VLAN information, the IP phone automatically completes the voice VLAN configuration.

• If the voice VLAN configuration is based on the received LLDP-MED TLVs or CDP packets, the IP phone will send out packets tagged with the advertised voice VLAN ID. The voice packets will be forwarded in the voice VLAN.

  For more information about configuring LLDP or CDP, see "Configuring LLDP or CDP to advertise a voice VLAN." For more information about LLDP and CDP compatibility, see "Configuring LLDP."

• If the voice VLAN configuration is based on the authorization VLAN information, the IP phone will send out packets tagged with the advertised authorization VLAN ID. The voice packets will be forwarded in the authorization VLAN.

  For more information about advertising the authorization VLAN information to IP phones, see "Dynamically advertising an authorization VLAN through LLDP or CDP." For more information about authorization VLANs, see Security Configuration Guide.

• If the voice VLAN configuration is based on the voice VLAN information of the accessing port, the voice traffic from the IP phone will be forwarded in the voice VLAN of the accessing port. Whether the voice packets are tagged depends on the voice VLAN configuration of the accessing port. For more information about configuring a voice VLAN on a port, see "Configuring a voice VLAN on a port."