Cisco 1720 Manual do Utilizador descarregar pdf (Página 11)

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LAN and WAN network design, addressing, and

conﬁguration. If vendor support is needed, a phone call to

a single vendor reduces management time and costs.

Figure 5 Hybrid Private/Virtual Private Network

Figure 5 shows a multinational corporation with

headquarters in Frankfurt. Its WAN was initially established

in Europe, with private leased lines connecting headquarters

to branch ofﬁces. This company now migrates some of its

sites to a VPN, starting with its international sites such as

Tokyo, Singapore,and Sydney to save oninternational WAN

costs and to reduce the complexity of leasing lines from

foreign telecom companies. They may either outsource the

entire VPN implementation to a global service provider,

sending trafﬁc over the provider’s shared IP backbone, or

implement on their own by subscribing to a local Internet

access line at each site and conﬁguring IPSec tunnels over

the Internet.

Cisco IOS software provides an end-to-end solution

across this hybrid of private and virtual private networks.

The small branch ofﬁces in Singapore and Sydney each use a

Cisco1720router withanintegratedCiscoIOSFirewall.The

larger branch ofﬁce in Tokyo uses a Cisco 2600 router. All

routers connected to the VPN have encrypted IPSec tunnels

set up to each other.

Remote access for mobile users is also migrated to a

VPN. An employee traveling worldwide can dial into a local

POP and an IPSec tunnel is established from his or her PC to

the Cisco PIX Firewall at the Frankfurt headquarters.

Long-distance dial charges are avoided because trafﬁc is

carried via the Internet or service provider’s shared

backbone. The PIX Firewall is ideal for larger enterprise sites

with requirements for high-bandwidth encryption, most

advanced security features, and fail-over capabilities.

As this company gets more experience with VPNs, it

migrates more and more sites from itsprivate WAN to VPN,

ensuring a smooth transition.

Figure 6 Small Branch Ofﬁce Access

Figure 6 illustrates that the Cisco 1720 router is ideal for

providing Internet and intranet access for small branch

ofﬁces of a corporation—with the most ﬂexibility and

investment protection of any router in its class. The

autosensing 10/100 Fast Ethernet provides the ﬂexibility of

easy migration to Fast Ethernet LANs. The two WAN

interface card slots provide maximum ﬂexibility in choosing

WAN services for current use as well as ﬂexibility to change

services later. The RISC processor and expansion slot for

Cisco 2600

Cisco 2500

Cisco 1720

Sydney

Small Branch

Office

Tokyo

Branch

Office

Paris

Small Branch

Office

London

Branch

Office

Cisco 1720

Singapore

Small Branch

Office

PIX Firewall

Frankfurt

Cisco 7000

Internet

or SP Shared

Backbone

Private

Cisco 1720

17201720

BRI

CiscoView

ISDN

Internet

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