Westermo RedFox Series - Manual (Page 276)

Westermo OS Management Guide
Version 4.17.0-0
VLAN 1
(untagged) VLAN3
(untagged) VLAN2
(untagged)
1/1 1/2 2/1 2/2 2/3 2/4 2/5 2/6 2/7 2/8
Switch A
(AVT and RSTP enabled)
VLAN 1
(untagged) VLAN3
(untagged) VLAN2
(untagged)
1/1 1/2 2/1 2/2 2/3 2/4 2/5 2/6 2/7 2/8
Switch B
(AVT and RSTP enabled)
VLAN3
(untagged) VLAN2
(untagged) VLAN3
(untagged) VLAN2
(untagged) VLAN 1
(untagged) VLAN 1
(untagged)
a) before connecting the switches
b) after connecting the switches
1/1 1/2 2/1 2/2 2/3 2/4 2/5 2/6 2/7 2/8
Switch B
(AVT and RSTP enabled)
1/1 1/2 2/1 2/2 2/3 2/4 2/5 2/6 2/7 2/8
Switch A
(AVT and RSTP enabled)
VLAN 1, 2 and 3 (all tagged)
Figure 13.3: Using Adaptive VLAN trunking (AVT) to dynamically add VLANs to
inter-switch ports.
Note
As AVT only considers the VLANs configured on the (local) switch when
adding VLANs to an inter-switch port, the operator of the LAN infras-
tructure should ensure that all switches have the same set of VLANs
defined. Otherwise the VLANs forwarded by different switches will be
inconsistent, resulting in lack of full connectivity on some VLAN(s).
❼ Removing dynamically added VLANs: When a port loses its status as inter-
switch port, all VLANs dynamically added to that port will be removed. The
port will then only be associated with the VLANs it has been configured with,
and with association mode (tagged or untagged) according to the configu-
ration.
❼ Prohibiting that a VLAN is added to a port: It is possible to prohibit that
some VLAN(s) is dynamically added to a port even when AVT is enabled.
276 ➞ 2015 Westermo Teleindustri AB