3Com 2928 User Guide - Page 200
If Link Aggregation Control Protocol LACP is enabled on a port, the voice VLAN function cannot
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z In automatic voice VLAN assignment mode, a hybrid port can process only tagged voice traffic. However, the protocol-based VLAN function requires hybrid ports to process untagged traffic. Therefore, if a VLAN is configured as the voice VLAN and a protocol-based VLAN at the same time, the protocol-based VLAN cannot be associated with the port. z At present, only one VLAN is supported and only an existing static VLAN can be configured as the voice VLAN. z If Link Aggregation Control Protocol (LACP) is enabled on a port, the voice VLAN function cannot be enabled on it. z After you assign a port working in manual voice VLAN assignment mode to the voice VLAN, the voice VLAN takes effect. 1-19
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1-19
In automatic voice VLAN assignment mode, a hybrid port can process only tagged voice traffic.
However, the protocol-based VLAN function requires hybrid ports to process untagged traffic.
Therefore, if a VLAN is configured as the voice VLAN and a protocol-based VLAN at the same time,
the protocol-based VLAN cannot be associated with the port.
At present, only one VLAN is supported and only an existing static VLAN can be configured as the
voice VLAN.
If Link Aggregation Control Protocol (LACP) is enabled on a port, the voice VLAN function cannot
be enabled on it.
After you assign a port working in manual voice VLAN assignment mode to the voice VLAN, the
voice VLAN takes effect.