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Configuration procedure
To enable LLDP to automatically discover IP phones:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enable LLDP to automatically
discover IP phones.
voice vlan track lldp Disabled by default.
IMPORTANT:
• When the switch is enabled to automatically discover IP phones throu
h LLDP, you can connect at mos
five IP phones to each port of the switch.
• You cannot use this function together with CDP compatibility.
Configuring LLDP to advertise a specific voice
VLAN
Voice VLAN advertisement through LLDP is available only for LLDP-enabled IP phones. If
CDP-compatibility is enabled, this feature is also available for CDP-enabled IP phones. For more
information about CDP compatibility, see "Configuring LLDP."
Configuration guidelines
Use this feature in one of the following scenarios:
• Decrease the voice VLAN processing delay in an IRF fabric.
On an LLDP-enabled port, LLDP advertises the voice VLAN information to the IP hone connected to
the port. When a packet arrives on the port, the switch compares the source MAC address against
its voice device OUI list. If a match is found, the switch learns the MAC address in the voice VLAN,
and promotes the forwarding priority for the packet. Because this process is completed in software,
in an IRF fabric, MAC address learning and synchronization of the learned MAC address entry to
all member devices introduces an undesirable delay. Directly specifying the voice VLAN to be
advertised by LLDP enables the IRF fabric to learn and synchronize MAC address entries faster in
hardware.
• Avoid configuring the voice VLAN function on a port.
Figure 50 sh
ows the procedure of voice VLAN advertisement through LLDP.
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