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Chapter 7 Interfaces
ZyWALL 110/310/1100 Series User’s Guide
159
7.8 Bridge Interfaces
This section introduces bridges and bridge interfaces and then explains the screens for bridge
interfaces.
Bridge Overview
A bridge creates a connection between two or more network segments at the layer-2 (MAC
address) level. In the following example, bridge X connects four network segments.
When the bridge receives a packet, the bridge records the source MAC address and the port on
which it was received in a table. It also looks up the destination MAC address in the table. If the
bridge knows on which port the destination MAC address is located, it sends the packet to that port.
If the destination MAC address is not in the table, the bridge broadcasts the packet on every port
(except the one on which it was received).
In the example above, computer A sends a packet to computer B. Bridge X records the source
address 0A:0A:0A:0A:0A:0A and port 2 in the table. It also looks up 0B:0B:0B:0B:0B:0B in the
table. There is no entry yet, so the bridge broadcasts the packet on ports 1, 3, and 4.
MD5
Authentication
Key
This field is available if the Authentication is MD5. Type the password for MD5
authentication. The password can consist of alphanumeric characters and the
underscore, and it can be up to 16 characters long.
Related Setting
Configure WAN
TRUNK
Click WAN TRUNK to go to a screen where you can set this VLAN to be part of a WAN
trunk for load balancing.
Configure Policy
Route
Click Policy Route to go to the screen where you can manually configure a policy
route to associate traffic with this VLAN.
OK Click OK to save your changes back to the ZyWALL.
Cancel Click Cancel to exit this screen without saving.
Table 53 Configuration > Network > Interface > VLAN > Create Virtual Interface (continued)
LABEL DESCRIPTION
Table 54 Example: Bridge Table After Computer A Sends a Packet to Computer B
MAC ADDRESS PORT
0A:0A:0A:0A:0A:0A 2