Westermo RedFox Series - Manual (Page 277)

Westermo OS Management Guide
Version 4.17.0-0
This feature is useful when the unit acts as a routing switch, where traffic
between some ports should be routed rather than switched.
To prohibit that a VLAN is dynamically added to a port, that port should be
configured with association mode forbid on that VLAN.
As of WeOS version v4.17.0 the forbid association mode only hinders a
port to be added to a VLAN dynamically via AVT. Ports not configured un-
tagged/tagged with any VLAN will still be mapped to the switch default VLAN
(VLAN 1), irrespective if that port is configured as forbid on VLAN 1. For more
information about the switch default VLAN, see
section 13.1.3 .
13.1.7.3 Prohibit disabling of Inter-Switch Ports
A port determined as inter-switch port by AVT will not be possible to disable by
management (Web, CLI, SNMP, etc.). This feature is added in order to avoid
unintentional loss of connectivity to the switch.
13.1.8 MAC forwarding database
WeOS switches maintain a MAC forwarding database holding information about
where to forward packets for each known MAC address. As of WeOS v4.17.0 a
single MAC forwarding database is used for all VLANs, referred to as shared VLAN
learning in [
14 ].
13.1.8.1 Managing Unicast MAC addresses
When the switch comes up, it will not know which stations are attached to its
ports. The switch inspects the destination MAC address of each incoming packet
without finding a match in the forwarding database - unknown unicast MAC ad-
dresses will be broadcasted on all ports of the associated VLAN.
The switch will automatically learn the location of stations in the LAN, by inspect-
ing the source MAC address of each incoming packet. Once it knows on which
port a certain MAC address resides, all future packets to that station will be for-
warded only onto that port.
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