Download ppt - 1 © 2004, Cisco Systems, Inc. All rights reserved. Wireless LAN bridge

1© 2004, Cisco Systems, Inc. All rights reserved.

Wireless LAN bridge


Bridge basicsBridge basics

• Wireless bridge :work at data link layer (layer 2 of OSI model)

• Wireless bridge: is a device that connect two or more networks that may use the same or different data link layer protocol located in different buildings.

• Keep traffic separated on both sides of the bridge.

• Deliver high data rate .

• Transmit packet simultaneously without causing Transmit packet simultaneously without causing collision.collision.


Types of WLAN bridgeTypes of WLAN bridge

1- Basic Ethernet – to - wireless

Connect directly to a single device by an Ethernet port , then provide Connect directly to a single device by an Ethernet port , then provide wireless connection to an access pointwireless connection to an access point

The single device such as (printer, PC) has Ethernet port and no wireless NIC.

This offer substitute for a radio NIC.

2- Work group bridge

Connecting of wireless network to large wired network.

-Work group bridge act as wireless client on the wireless LAN and then interfaces to a wired network

-- The advantages of Work group bridge is offering high management and security.

-The disadvantages of work group bridge is tاhe higher price.


Types of WLAN bridgeTypes of WLAN bridge

3-Access Point (AP) / Wireless bridge3-Access Point (AP) / Wireless bridge

Some access point can be configured as a bridge.

-Can be operate:

-1- Point – to – point

-2- Point- to – multipoint

-Advantages of wireless bridge

-1- Very practical

-2- Extend the range of existing WLANs

-3- Easy to configure


Point – to – point wireless bridgePoint – to – point wireless bridge

-If there is a company contain of two buildings, the two buildings are separated by a road

-The options for connecting any two building with network link include .

1-Direct connect private cabling (like fiber)1-Direct connect private cabling (like fiber)

When using fiber cables and connect it under road it costs higher price.

2- Leased line telecom2- Leased line telecom

It works good but with higher cost and limited bandwidth.

3- Wireless technology3- Wireless technology

It is the excellent choice .


Point – to – point wireless bridgePoint – to – point wireless bridge

Point -to -Point (PTP) BridgingPoint -to -Point (PTP) Bridging::

A point to point topology is the simplest to configure and connects two A point to point topology is the simplest to configure and connects two networks in two separate locations, normally a remote building or networks in two separate locations, normally a remote building or warehouse, via one wireless bridge in each location.warehouse, via one wireless bridge in each location.


Point-to-point configuration

•When using point-to-point wireless bridges, two LANs can be located up to 40 km (25 miles) apart.Obstacles such as buildings, trees, and hills will cause communication problems.


Point – to – point wireless networkingPoint – to – point wireless networking

Advantages of Point – to – point wireless bridge :Advantages of Point – to – point wireless bridge :

1- Good bandwidth (11 – 54 mbps) that run most application.

2- Cheap.

3- Portable

The wireless equipment be moved when you leave.

Disadvantages of Point – to – point wireless bridge:Disadvantages of Point – to – point wireless bridge:

1- Reliability problem.

2- Must have wireless expertise


Point – to – multipoint wireless bridgePoint – to – multipoint wireless bridge

•Point – to – multipoint wireless bridgePoint – to – multipoint wireless bridge : the solution for

creating a wireless Ethernet like multiple location .

•A point to Multipoint topology wirelessly connects multiple locations together allowing them to share the same network resources.

• The bridge at the main, central, location is called the root bridge or base station bridge and all data passing between the wireless bridge clients must pass through the root bridge first.


Point-to-multipoint configuration

Non-root Non-root

root

•For multipoint bridging, an omni directional antenna is typically used at the main site. •Directional antennas are used at the remote sites.•Traffic from one remote site to another will be sent to the main site and then forwarded to the other remote site. •Remote sites cannot communicate directly with one another. •Line of sight must be maintained between each remote site and the main site.


Point – to – multipoint wireless bridgePoint – to – multipoint wireless bridge

These point-to-multipoint networks are used in wireless internet service providers (WISP), large corporate campuses, distribution facilities, school districts, public safety applications and many others

Advantages:

Low costHigh speed

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Root modes

• Cisco Aironet access points and bridges have two different root modes, in which to operate the following:

Root = ON —

The bridge or AP is a root.

If it is a bridge, then it is called the master bridge.

Root = OFF —

The bridge or AP is not a root, non-root.


What do I need to build a Point to Point Bridge Link?What do I need to build a Point to Point Bridge Link?

Line of sight between the two locations. A site survey is recommended before installation. Select a wireless bridge: Here are some things to consider when selecting a wireless bridge :

Distance: Distance will determine what gain antenna will be required . Wireless protocol: Do you want to use a bridge base on 802.11 standards . Frequency

Indoor or Outdoor: Indoor wireless bridges are less expensive . An outdoor bridge can be placed right next to the antenna and therefore cuts down on the amount of cable you need to buy. Select a wireless antenna: If the bridge you selected does not already have an integrated antenna you will need to choose one now.

antenna cables to get you connected and protected.


Connecting to the bridgeConnecting to the bridge

When the bridge is powering up there are three LEDs:Green LED : indicate normal activityRed LED : the unit isn’t operating correctlyAmber LED: indicate error or warning

Ways of configuration :Ways of configuration :

1- Configuring using GUI (1- Configuring using GUI (through web browser)through web browser)

2- Configuring using CLI2- Configuring using CLI

3- 3- Accessing through telnetAccessing through telnet