Enterasys Networks CSX7000 Manual do Utilizador descarregar pdf (Página 310)

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101

USER’S GUIDE

310 CyberSWITCH

Bridge to Bridge Environment

As shown in the picture above, when a remote LAN is connected with bridge devices, the DHCP

server and clients communicate with each other as if they were on the same LAN. This is one

example configuration of how DHCP can be used to accomplish the dynamic IP address

assignment to the remote IP devices. (Note: This topology works without enabling any additional

DHCP/BOOTP features.)

Router to Bridge Environment

Although the bridge to bridge environment is a simple way to deploy the dynamic IP address

assignment using DHCP, it has some disadvantages. The major disadvantage is a broadcast storm.

Since all remote LANs are connected through bridge devices, all broadcast traffic will be forwarded

from one remote LAN to all the other LANs, and from a central LAN to all other remote LANs. This

is especially undesirable in the environment where there are many remote LANs.

To solve this problem, IP routing should be turned on at the central site. Enabling routing at the

central site will prevent the broadcast traffic from traveling all over the wide area network.

Unfortunately, this also keeps DHCP messages from being exchanged, as they are transmitted in

the broadcast packets. The DHCP Relay Agent resolves this situation, allowing only DHCP

messages to be forwarded without letting all other broadcast traffic get through.

CSX5500 Using bridging

CSX1200 Remote Bridge

DHCP Client

DHCP

DHCP Server

B25B27

B26B28

WORKGROUP REMOTE ACCESS SWITCH

B29

E1 ONLYB-CHANNELS

LAN

10BASE-TRXTXSERVICE

B31

B30 L1

B21B23

B22B24

B17B19

B18B20

B13B15

B14B16

B9 B11

B10B12

B5 B7

B6 B8

B1 B3

B2 B4

POWER

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Enterasys Networks CSX7000 Manual do Utilizador Página 310

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