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VLAN Considerations
Issue 4 August 2006 93
Table 7 provides several VLAN separation guidelines.
Table 7: VLAN Separation Rules
If Then
VLANSEP is “0”
(Disabled),
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” (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.
VLANSEP is “1”
(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.
VLANSEP is “1”
(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.