Bridge Interface Overview; Table 69 Example: Bridge Table After Computer A Sends A Packet To Computer B; Table 70 Example: Bridge Table After Computer B Responds To Computer A; Table 71 Example: Routing Table Before And After Bridge Interface Br0 Is Created - ZyXEL Communications ZyWALL USG 300 User Manual

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.

Table 69 Example: Bridge Table After Computer A Sends a Packet to Computer B

MAC ADDRESS
0A:0A:0A:0A:0A:0A
If computer B responds to computer A, bridge X records the source address
0B:0B:0B:0B:0B:0B and port 4 in the table. It also looks up 0A:0A:0A:0A:0A:0A in the table
and sends the packet to port 2 accordingly.

Table 70 Example: Bridge Table After Computer B Responds to Computer A

MAC ADDRESS
0A:0A:0A:0A:0A:0A
0B:0B:0B:0B:0B:0B

10.14.2 Bridge Interface Overview

A bridge interface creates a software bridge between the members of the bridge interface. It
also becomes the ZyWALL's interface for the resulting network.
Unlike the device-wide bridge mode in ZyNOS-based ZyWALLs, this ZyWALL can bridge
traffic between some interfaces while it routes traffic for other interfaces. The bridge
interfaces also support more functions, like interface bandwidth parameters, DHCP settings,
and ping check. To use the whole ZyWALL as a transparent bridge, add all of the ZyWALL's
interfaces to a bridge interface.
A bridge interface may consist of the following members:
• Zero or one VLAN interfaces (and any associated virtual VLAN interfaces)
• Any number of Ethernet interfaces (and any associated virtual Ethernet interfaces)
When you create a bridge interface, the ZyWALL removes the members' entries from the
routing table and adds the bridge interface's entries to the routing table. For example, this table
shows the routing table before and after you create bridge interface br0 (250.250.250.0/23)
between ge1 and vlan1.

Table 71 Example: Routing Table Before and After Bridge Interface br0 Is Created

IP ADDRESS(ES)
210.210.210.0/24
210.211.1.0/24
221.221.221.0/24
222.222.222.0/24
230.230.230.192/26
241.241.241.241/32
242.242.242.242/32
In this example, virtual Ethernet interface ge1:1 is also removed from the routing table when
ge1 is added to br0. Virtual interfaces are automatically added to or remove from a bridge
interface when the underlying interface is added or removed.
ZyWALL USG 300 User's Guide
PORT
2
PORT
2
4
DESTINATION
ge1
ge1:1
vlan0
vlan1
ge3
ge4
ge5
Chapter 10 Interface
IP ADDRESS(ES) DESTINATION
221.221.221.0/24 vlan0
230.230.230.192/26 ge3
241.241.241.241/32 ge4
242.242.242.242/32 ge5
250.250.250.0/23 br0
231