AudioCodes Mediant 500L User Manual page 144

Parameter
[DeviceTable_VlanID]
Underlying Interface
underlying-if
[DeviceTable_UnderlyingInterface]
Tagging
tagging
[DeviceTable_Tagging]
MTU
mtu
[DeviceTable_MTU]
User's Manual
Note: Each Ethernet Device must have a unique VLAN ID.
Assigns an Ethernet Group to the Ethernet Device. To configure
Ethernet Groups, see Configuring Ethernet Port Groups on page
140.
Note: The parameter is mandatory.
Defines VLAN tagging for the Ethernet Device.

[0] Untagged = (Default for pre-configured Ethernet Device)
The Ethernet Device accepts untagged packets and packets
with the same VLAN ID as the Ethernet Device. Incoming
untagged packets are assigned the VLAN ID of the Ethernet
Device. The Ethernet Device sends these VLAN packets
untagged (i.e., removes the VLAN ID).

[1] Tagged = (Default for new Ethernet Devices) The Ethernet
Device accepts packets that have the same VLAN ID as the
Ethernet Device and sends packets with this VLAN ID. For all
Ethernet Devices that are associated with the same Ethernet
Group (see 'Underlying Interface' parameter above) and
configured to Tagged, incoming untagged packets received
on this Ethernet Group are discarded.
Note: Only one Ethernet Device can be configured as Untagged
per associated Ethernet Group. In other words, if multiple
Ethernet Devices are associated with the same Ethernet Group,
only one of these Ethernet Devices can be configured to
Untagged; all the others must be configured to Tagged.
Defines the Maximum Transmission Unit (MTU) in bytes per
VLAN (Ethernet Device).
The valid value is 68 to1,500. The default is 1,500.
Note:

MTU is not applicable to SBC Direct Media traffic and to
debug recording traffic.

If your first Ethernet Device is configured with an untagged
VLAN, its MTU value is the maximum MTU that can be
configured for all other Ethernet Devices that are associated
with the same Ethernet Group. In other words, if you
configure additional Ethernet Devices (tagged VLANs) that
are associated with the same Ethernet Group, their MTUs
must be equal to or less than the MTU of the first Ethernet
Device (untagged VLAN). For example, if the untagged VLAN
is configured with MTU of 100 bytes, you can configure a
tagged VLAN with an MTU value of either 100 bytes or less.

If your first Ethernet Device is configured with a tagged VLAN
and you later configure an additional Ethernet Device with an
untagged VLAN that is associated with the same Ethernet
Group, the MTU of the untagged VLAN must be equal to or
greater than the highest MTU value configured out of all the
Ethernet Devices (VLANs) associated with the Ethernet
Group. For example, if VLAN 1 is configured with the highest
MTU (100 bytes) out of all your VLANs, you can configure an
untagged VLAN with an MTU value of either 100 bytes or
greater.
144
Mediant 500L Gateway & E-SBC
Description
Document #: LTRT-10532