Siemens RX1500

Chapter 5
Setup and Configuration
RUGGEDCOM ROX II
User Guide
726 Ingress and Egress Rules
The switch can 'pass through' traffic, forwarding frames received on one trunk port out of another trunk port. The
trunk ports must be members of all VLANs that the 'pass through' traffic is part of, even if none of those VLANs
are used on edge ports.
Frames transmitted out of the port on all VLANs other than the port's native VLAN are always sent tagged.
NOTE
It may be desirable to manually restrict the traffic on the trunk to a specific 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 LANs. To prevent the trunk port from being a member of the VLAN, include it in the VLAN's
Forbidden Ports list.
For more information about the Forbidden Ports list, refer to Section 5.35.1.5, “Forbidden Ports List”.
Port Type VLANs Supported PVID Format Usage
Untagged VLAN Unaware Networks: All frames are sent and received without
the need for VLAN tags.
Edge 1 (Native)
Configured
Tagged VLAN Aware Networks: VLAN traffic domains are enforced on a
single VLAN.
Trunk All Configured Tagged or Untagged 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.
Section 5.35.1.4
Ingress and Egress Rules
Ingress and egress rules determine how traffic is received and transmitted by the switch.
Ingress rules are applied as follows to all frame when they are received by the switch:
Frame Received
a
Untagged
Priority Tagged
(VID = 0)
Tagged (Valid VID)
VLAN ID associated with the frame PVID PVID VID in the Tag
Frame dropped due to its tagged/untagged format No No No
Frame dropped if the frame associated with the VLAN is not
configured (or learned) in the switch
Yes
Frame dropped if the ingress port is not a member of the VLAN the
frame is associated with
No
a
Does not depend on the ingress port's VLAN configuration parameters.
Egress rules are applied as follows to all frames when they are transmitted by the switch.
On Other VLAN
Egress Port Type On Egress Port's Native VLAN
Port Is a Member Of the VLAN
Port Is Not a
Member Of the VLAN
Edge Dropped
Trunk
According to the egress port's
PVID Format parameter
Tagged Dropped