Cisco WS-C1924-EN-DC - 100Mbps Ethernet Switch Manual de usuario descargar pdf (Pagina 35)

Overview 1-35

100BaseT Redundant Backbone with Multiple Switches

Figure 1-11 illustrates how network redundancy provides two advantages:

• A backup path, in the event of a failure in the network

• Load-balancing, when two or more paths to a destination exist and both can be used,

depending on the network load

A 100-Mbps (200 Mbps in full-duplex) redundant backbone is created by connecting

Catalyst 1900 switches to 100BaseT backbone switches or routers, such as Catalyst 5000

switches or Cisco 7000 routers. Each Catalyst 1900 switch connects to the two backbone

devices, shown in the top-left and top-right corners, in a redundant conﬁguration. If

connectivity is lost to one of the backbone routers or switches, the network uses the

redundant connection.

Spanning-Tree Protocol, available only on switches, ensures that only one of the two

connections from each switch is active (the primary link), ensuring that there are no loops

in the network paths. If the primary link fails, the secondary link becomes active.

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Cisco WS-C1924-EN-DC - 100Mbps Ethernet Switch Manual de usuario Pagina 35