Comtech EF Data CDM-840 - Manual (Page 195)

CDM-840 Remote Router Revision 2
Appendix C MN-CDM840
C–3
C .2.3 VL AN Trunking
In a VLAN Trunking topology (Figure C-4), the Hub side equipment functions as a VLAN trunking
interface. You can map Outbound packets (Hub to Remote) to the desired QoS Group (see Sect.
C.6).
By default, the CDM-840 equipment functions as a VLAN trunk and passes all traffic received on
the WAN and Traffic LAN ports. In this mode, you should have a VLAN-enabled Ethernet Switch
at each remote to properly break out the VLAN into the desired network topology.
In addition, you can optionally configure the CDM-840 in Access Mode with a user assigned
VLAN ID (see Sect. C.4).
Figure C-4. BPM with VLANs
C.3 Packet Processing
C .3.1 Traffic Network / E thernet S witch B ehavior
The Advanced VSAT BPM feature functions as a Learning Ethernet Switch when you set the
“Working Mode” to BPM. BPM has the following basic functionality:
• MAC addresses associated with each segment/port are learned by inspecting the source
MAC for packets arriving at each Ethernet port.
• Once the port association for a MAC address is learned, an Ethernet Switch will not
transmit Ethernet packets with that MAC address to other segments/ports.
• Broadcast packets are sent out all interfaces.