Westermo RedFox Series User Manual
Page 275
Westermo OS Management Guide
Version 4.17.0-0
simplified - once a switch detects that it is connected to another switch, all VLANs
defined on the local switch will automatically be added to that port, see
Future versions of WeOS may include dynamic VLAN support via the standard
IEEE GVRP[
] protocol in addition to AVT.
13.1.7.1
Determining Inter-Switch Ports
To determine if a port on a switch is connected to another switch, AVT will utilise
information from the FRNT and RSTP protocols:
❼ FRNT: If FRNT is enabled on the switch, any port configured as an FRNT port
will be classified as an inter-switch port by AVT. If FRNT is disabled, or if
the FRNT port configuration is changed, AVT will adapt its inter-switch port
classification accordingly. For more information on FRNT, see
❼ RSTP: If RSTP is enabled on a port, AVT will consider the reception of an
RSTP or STP message as a sign that it is connected to another switch on
the receiving port. The port will continue to be classified as an inter-switch
port until the link goes down or until RSTP is disabled on that port. For more
information on RSTP, see
13.1.7.2
Dynamic addition/deletion of VLANs to Inter-Switch Ports
Once a port has been defined as an inter-switch port, that port will dynamically
be associated (tagged) with all VLANs configured on the switch. The exception is
when that port has been configured in association mode forbid on some VLAN(s)
- the port will not be associated with those VLANs.
Further details of the mechanism to associate VLANs dynamically to an inter-
switch port are given below:
❼ Association mode of dynamically added VLANs: All VLANs configured on the
switch will be associated tagged by AVT. This applies even to those VLANs
configured untagged on that port.
shows an example.
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