Devolo dLAN 200 DSpro, Руководство пользователя

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Auto-configuration
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devolo dLAN 200 DSpro Manual
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38
Once the dLAN 200 DSpro adapter has received the translation table and does
not need to configure anything with regards to VLANs, it can complete the fol-
lowing steps: DHCP, TFTP and configuration.
12.7.3 OVLAN Configuration and Root Interface
The basic OVLAN configuration in Wisconsin avoids the visibility between cus-
tomers connected to the end user nodes in a simple way. All of the customer
data packets in the same LV cell are tagged with the Rootpath OVLAN. This tag
is the only allowed tag in the entire path to the backbone. In the path from the
backbone to the customers, the packets are tagged with the ALL_VLAN tag
(4095) in equipment that is connected to the backbone, and no tag is allowed
in this path. However, packets with the ALL_VLAN tag are not filtered.
An example of the basic OVLAN configuration is shown in Figure 14. OVLAN
filtering is done with egress lists. The lists are shown between {…}. The root
interfaces lists are always filled with the Rootpath OVLAN, while the other inter-
faces are void allowed lists (only packets with the ALL_VLAN tag are allowed).
The result is that only the depicted downstream and upstream paths are allo-
wed.
The root interface is discovered automatically as the root port of the spanning
tree protocol,
so it is mandatory to have the STP enabled for the OVLAN to
work . When a node is going to be the root node (the HE in the figure for
instance) the root interface must be specified inside the autoconfiguration file.
It will always be one of the external interfaces.