Zyxel ZyWALL-USG50 Router Manual PDF (Setup & Configuration Guide)

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Chapter 11 Interfaces

ZyWALL USG 50 User’s Guide

256

11.7

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.

Table 64

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

MAC ADDRESS

PORT

0A:0A:0A:0A:0A:0A

2

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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.

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 connectivity 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 lan1 and vlan1.

In this example, virtual Ethernet interface lan1:1 is also removed from the routing

table when lan1 is added to br0. Virtual interfaces are automatically added to or

remove from a bridge interface when the underlying interface is added or

removed.

Table 65

Example: Bridge Table After Computer B Responds to Computer A

MAC ADDRESS

PORT

0A:0A:0A:0A:0A:0A

2

0B:0B:0B:0B:0B:0B

4

Table 66

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

IP ADDRESS(ES)

DESTINATION

IP ADDRESS(ES)

DESTINATION

210.210.210.0/24

lan1

221.221.221.0/24

vlan0

210.211.1.0/24

lan1:1

230.230.230.192/26

wan2

221.221.221.0/24

vlan0

241.241.241.241/32

dmz

222.222.222.0/24

vlan1

242.242.242.242/32

dmz

230.230.230.192/26

wan2

250.250.250.0/23

br0

241.241.241.241/32

dmz

242.242.242.242/32

dmz

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11.7.1

Bridge Summary

This screen lists every bridge interface and virtual interface created on top of

bridge interfaces. To access this screen, click

Configuration > Network >

Interface

>

Bridge

.

Figure 164

Configuration > Network > Interface > Bridge

Each field is described in the following table.

Table 67

Configuration > Network > Interface > Bridge

LABEL

DESCRIPTION

Add

Click this to create a new entry.

Edit

Double-click an entry or select it and click

Edit

to open a screen

where you can modify the entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL

confirms you want to remove it before doing so.

Activate

To turn on an entry, select it and click

Activate

.

Inactivate

To turn off an entry, select it and click

Inactivate

.

Create Virtual

Interface

To open the screen where you can create a virtual interface, select an

interface and click

Create Virtual Interface

.

Object References

Select an entry and click

Object Reference

s to open a screen that

shows which settings use the entry. See

Section 11.3.2 on page 230

for an example.

#

This field is a sequential value, and it is not associated with any

interface.

Status

This icon is lit when the entry is active and dimmed when the entry is

inactive.

Name

This field displays the name of the interface.

IP Address

This field displays the current IP address of the interface. If the IP

address is 0.0.0.0, the interface does not have an IP address yet.

This screen also shows whether the IP address is a static IP address

(

STATIC

) or dynamically assigned (

DHCP

). IP addresses are always

static in virtual interfaces.

Member

This field displays the Ethernet interfaces and VLAN interfaces in the

bridge interface. It is blank for virtual interfaces.

Apply

Click

Apply

to save your changes back to the ZyWALL.

Reset

Click

Reset

to return the screen to its last-saved settings.

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11.7.2

Bridge Add/Edit

This screen lets you configure IP address assignment, interface bandwidth

parameters, DHCP settings, and connectivity check for each bridge interface. To

access this screen, click the

Add

icon at the top of the

Add

column in the

Bridge

Summary

screen, or click an

Edit

icon in the

Bridge Summary

screen. The

following screen appears.

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Chapter 11 Interfaces

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260

Figure 165

Configuration > Network > Interface > Bridge > Add

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