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VLAN Considerations
Issue 2 December 2007 97
Table 12: VLAN Separation Rules
If Then
VLANSEP is “0”, OR the telephone is
not tagging frames,
OR the telephone is
tagging frames with a
VLAN ID equal to
PHY2VLAN.
Frames received on the secondary Ethernet interface
will not be changed before forwarding. For example,
tagging is not added or removed and the VLAN ID
and tagged frames priority are not changed. The
Ethernet switch forwarding logic determines that
frames received on the Ethernet line interface are
forwarded to the secondary Ethernet interface or to
the telephone without regard to specific VLAN IDs or
the existence of tags.
VLANSEP is “1” (On/Enabled) All tagged frames received on the secondary Ethernet
interface are changed before forwarding to make the
VLAN ID equal to the PHY2VLAN value and the
priority value equal to the PHY2PRIO value.
Untagged frames received on the secondary Ethernet
interface are not changed before forwarding.
Tagged frames with a VLAN ID of zero
(priority-tagged frames) will either be:
- forwarded without being changed (preferred), or
- changed before they are forwarded such that the
VLAN ID of the forwarded frame is equal to the
PHY2VLAN value and the priority value is equal to
the PHY2PRIO value.
VLANSEP is “1”
(On/Enabled)
AND the telephone is
not tagging frames,
OR if the telephone is
tagging frames with a
VLAN ID equal to
PHY2VLAN,
OR if the PHY2VLAN
value is zero.
The Ethernet switch forwarding logic determines that
frames received on the Ethernet line interface are
forwarded to the secondary Ethernet interface or to
the telephone without regard to specific VLAN IDs or
the existence of tags.
Frames received on the secondary Ethernet interface
will not be changed before forwarding. In other words,
tagging is not added or removed, and the VLAN ID
and priority of tagged frames is not changed.
VLANSEP is “1”
(On/Enabled)
AND the telephone is
tagging frames with a
VLAN ID not equal to
PHY2VLAN,
AND the PHY2VLAN
value is not zero.
Tagged frames received on the Ethernet line interface
will only be forwarded to the secondary Ethernet
interface if the VLAN ID equals PHY2VLAN.
Tagged frames received on the Ethernet line interface
will only be forwarded to the telephone if the VLAN ID
equals the VLAN ID used by the telephone.
Untagged frames will continue to be forwarded or not
forwarded as determined by the Ethernet switch
forwarding logic.
Tagged frames with a VLAN ID of zero
(priority-tagged frames) will either be:
- forwarded to the secondary Ethernet interface or the
telephone as determined by the forwarding logic of
the Ethernet switch (preferred), or
- dropped.