Cisco VIC-2FXO - 3600 Voice Interface Card-Fxo 2600/3600 Uživatelský manuál stáhnout pdf (Strana 12)

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Inter-VLAN Routing

Virtual LANs (VLANs) enable switches and routers to create

logical topologies over the physical network infrastructure,

allowing any collection of LAN segments within a network to be

combined into an autonomous user group, appearing as a single

LAN. The Cisco 2620 and Cisco 2621 support Cisco’s

Inter-Switch Link (ISL) and 802.1Q protocol available in Cisco

IOS “Plus” feature sets, enabling an end to end VLAN solution

when used in conjunction with the Cisco 2600, 3600, 4000 and

7X00 Series routers and Cisco’s Catalyst 1900, 2820, 2900XL,

and 5X00 Series switches.

VLANs offer several beneﬁts to network managers: reducing

the cost of adds, moves, and changes, improving network

management and bandwidth usage, and providing ﬂexibility,

performance, and security.

Figure 9 depicts a typical VLAN, in which trafﬁc is switched

between LAN interfaces that belong to the same VLAN. Here, the

criteria for VLAN membership is departmental function;

however, users could also be combined in VLAN topologies

based upon a common protocol or subnet address. Regardless of

physical location or interface type, network managers can deﬁne

workgroups based on logical function rather than physical

location through simple port conﬁguration in software. Using

VLAN enabled switches and routers obviate the need for

expensive, time-consuming recabling to extend network

connectivity in LAN environments.

Figure 10 Inter-VLAN Routing

Cisco 3640

with ISL

Cisco Catalyst

5X00 Series

VLAN Switch

Regional Office Branch Office

Cisco 2620 or

2621 with ISL

Cisco Catalyst

1900 Series

VLAN Switch

Intranet

Leased Line

Frame Relay

ISDN

Fast

Ethernet

VLAN

Trunking

1 2 ... 7 8 9 10 11 12 13 14 15 16

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