Vlan Ingress And Egress Rules; Forbidden Ports List; Vlan-Aware Mode Of Operation - RuggedCom RuggedBackbone RX5000 User Manual

26. Virtual LANs
Frames transmitted out of the port on all VLANs other than the port's native VLAN are always sent
tagged.
Sometimes it may be desirable to manually restrict the traffic on the trunk to a specified
group of VLANs; for example, when the trunk connects to a device, such as a Layer 3
router, that supports a subset of the available VLANs. To prevent the trunk port from being
a member of the VLAN, include it in the VLAN's Forbidden Ports list.
Port Type VLANs Supported
Edge
Trunk All Configured
Table 26.1. Port Types

26.1.5. VLAN Ingress and Egress Rules

Ingress Rules
The VLAN ingress rules are applied to all frames when they are received by the switch:
Frame received
This does not depend on ingress port's VLAN
configuration parameters
VLAN ID associated with the frame
Frame dropped due to its tagged/untagged format
Frame dropped, if frame associated with VLAN not configured
(or learned) in the switch
Frame dropped, if ingress port is not a member of the VLAN
the frame is associated with
Table 26.2. Ingress Rules
Egress Rules
The VLAN egress rules are applied to all frames when they are transmitted by the switch:
Frame sent
Egress port type
Edge
Trunk
Table 26.3. Egress Rules

26.1.6. Forbidden Ports List

Each VLAN can be configured to exclude ports from membership in the VLAN.

26.1.7. VLAN-aware Mode of Operation

The native operation mode for an IEEE 802.1Q compliant switch is VLAN-aware. Even if a specific
network architecture does not use VLANs, ROX™ default VLAN settings allow the switch still to
ROX™ v2.2 User Guide
PVID Format
Untagged
1 (Native)
Configured
Tagged
Tagged or
Untagged
On egress port's
native VLAN
According to the egress port's
"PVID Format" parameter
Usage
VLAN Unaware networks – All frames are sent and received
without the need for VLAN tags.
VLAN Aware networks – VLAN traffic domains are enforced
on a single VLAN.
Switch-to-Switch connections – VLANs must be manually
created and administered or can be dynamically learned
through GVRP.
Multiple-VLAN end devices – Implement connections to end
devices that support multiple VLANs at the same time.
Untagged
Tagged (VID=0)
PVID
No
N/A
N/A
On other VLAN
Port is a member
of the VLAN
N/A (frame is dropped)
Tagged
266
Tagged
Priority
(valid VID)
PVID VID in the tag
No No
N/A Yes
N/A No
Port is not a
member of the VLAN
dropped
RuggedBackbone™ RX5000