Westermo RedFox Series - Manual (Page 273)

Westermo OS Management Guide
Version 4.17.0-0
❼ Priority tagged packets, i.e., packets with VID 0, will be associated with the
port’s default VID.
❼ Typically tagged packets (VID in range 1-4094) or priority tagged packets
(VID 0) are only accepted on ports where there is at least on VLAN associated
tagged. In addition, the packet will only be accepted if the inbound port is
associated (untagged or tagged) the VLAN of the packet.
A common MAC address database is used for all VLANs (shared VLAN learning).
13.1.3 Switch default VLAN
In WeOS the VLAN with VID 1 (VLAN 1) is denoted as the switch default VLAN.
Ports not associated with any VLAN (neither untagged nor tagged) will automati-
cally be configured untagged to the switch default VLAN. This could happen when
a port is removed from a VLAN, or when a whole VLAN is removed.
Note
The main purpose of the switch default VLAN is to avoid loss of remote man-
ageability of a switch due to a change in the VLAN configuration. Without
a default VLAN, you risk to lose remote access to the switch if the ports
used to connect to the switch are removed from all VLANs (unintentionally
or deliberately).
With the default VLAN feature, the switch is still manageable via those ports,
given that proper IP and firewall settings are configured for the network
interface associated with the switch default VLAN.
The switch default VLAN cannot be removed. However, it is possible to remove
all ports from the default VLAN by assigning them to other VLANs.
13.1.4 VLAN Priority
It is possible to assign an IEEE 802.1p priority to a VLAN. This feature can be
useful when an operator likes to assign a higher priority to traffic on a certain
VLAN, e.g., a VLAN dedicated for IP telephony.
When a VLAN priority is configured, all packets associated with that VLAN will
be treated according to the given VLAN priority, rather than basing the packet’s
priority on VLAN tag priority, IP ToS/DiffServ or inbound port identifier. For more
information on layer-2 priority, see
section 8.1.4 .
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