Black Box LRU4240 - Manual (Page 60)

48 SALES: 0870 90 10 750 Dual Trunk E1 Router User’s Guide
Dual Trunk E1 Router
Whenever a packet destined to a particular MAC address is received, the MAC port map table is
consulted, if an entry exists then that packet is transmitted or forwarded on that port. If there are no
entry and the packet is received on the Ethernet port, it is forwarded on all the network ports.
Incoming packets from the network ports are forwarded over the Ethernet port.
NOTE: Current software release does not implement Spanning Tree algorithm to control and eliminate bridging loops.
You will need to avoid bridging loops in your network topology.
Managing the unit in Bridging mode
In bridging mode the unit’s Ethernet port IP address is considered the unit IP address, it is the only
valid IP address. IP traffic coming from the LAN or the WAN with the destination IP address set to
the unit IP address will be processed by the unit as management traffic.
VLAN Forwarding support
The bridge forwards VLAN tagged frames transparently between the LAN and the WAN interfaces.
If the unit ”Management VLAN ID” is set to disabled, IP packets with the destination IP address
matching the unit IP address will be considered as management traffic regardless of the frame’s
VLAN ID value.
Management VLAN ID
To manage the unit with specific VLAN setting, you will need to set the unit “Management VLAN
ID” and “Management VLAN priority” from menu-$A or using the command line interface.
In this case, management traffic is identified by matching the VLAN ID with the unit’s
Management VLAN ID, and the destination MAC address with the Ethernet port MAC address, or
the destination IP address with the unit’s port IP address.
Bridging Application Examples
WAN Gateway for IP VPN Application
Connect to your IP VPN over fractional to full E1 circuit using PPP or Frame Relay. For higher
bandwidth bond the two E1 links using MLFR or MLPPP, provided your Service Provider supports
Multilink Frame Relay or MLPPP services.
The external VPN appliance connected to your LRU4240 initiates and terminates tunnels. The
LRU4240 functions as a gateway to your WAN and transfers IP packets at E1 or dual E1 wirespeed.
Point-to-point LAN Extension
Connect two remote LANs over fractional to full E1 circuits transparently using PPP, or Frame
Relay on a single DLCI. For higher bandwidth bond the two E1 links using MLPPP or MLFR on
Menu-0A.
Multipoint Bridge example
Connect multiple remote LANs over a Frame Relay network. For higher bandwidth bond the two
T1/E1 links using MLFR, provided your Service Provider supports Multilink Frame Relay services.