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VLANs
ROS™ v3.5 172 RS400
To ensure the required operation in any possible application scenario and provide full
compatibility with legacy (VLAN-unaware) devices RuggedSwitch
TM
can be configured to work
in a VLAN-unaware mode.
In that mode:
• Frames ingressing a VLAN-unaware switch are not associated with any VLAN
• Frames egressing a VLAN-unaware switch are sent out unmodified, i.e. in the same
untagged, 802.1Q-tagged or priority-tagged format as they were received
6.1.9 GVRP (Generic VLAN Registration Protocol)
GVRP is an industry-standard protocol designed to propagate VLAN information from device to
device. With GVRP, edge switches may be manually configured with all the desired VLANs, and
switches on the network learn those VLANs dynamically. An end node, which is GVRP aware,
can be plugged into any switch and be connected to that end node's desired VLAN.
When a switch sends GVRP BPDUs out of all GVRP enabled ports, GVRP BPDUs advertise all
the VLANs known to that switch (configured manually or learned dynamically through GVRP) to
the rest of the network.
When a GVRP enabled switch receives a GVRP BPDU advertising a set of VLANs, the
receiving port becomes a member of those advertised VLANs and the switch begins advertising
those VLANs out all the GVRP enabled ports (other than the port on which the VLANs were
learned).
To improve network security using VLANs, GVRP enabled ports may be configured to prohibit
learning any new dynamic VLANs but at the same time allowed to advertise the VLANs
configured on the switch.