Cisco WS-C3020 Manual de usuario descargar pdf (Pagina 2)

2 Cisco Product Catalog, July, 2001

All-routes explorer reduction provides trafﬁc control for networks with multiple user rings connected to dual-backbone

segments. With this feature, when a client station sends an explorer frame, the switch forwards a copy of only one frame if

it has not already been seen by the switch on any of its other ports. Therefore, in a dual-backbone conﬁguration, each user

ring receives only two copies of the broadcast. In this way, the client stations still learn backup paths to their servers, and the

user rings are protected from unnecessary broadcast trafﬁc. User-conﬁgurable broadcast thresholds are provided to protect

end systems from excessive explorer trafﬁc. Priority queues within the switch ensure that delay-sensitive trafﬁc, such as

multimedia applications, are forwarded ﬁrst.

The Catalyst 3900 provides a wide range of options for a high-speed, scalable interconnection between switches. The ATM

OC-3c uplink offers ATM Forum-compliant LAN Emulation 1.0. In addition, a frame-based alternative to ATM is provided

by an ISL uplink that enables Token Ring transport over Fast Ethernet. A third alternative, available with the TokenChannel

feature, allows you to group up to eight ports together as one logical port for up to 256Mbps of bandwidth between switches.

Figure 21-4: Catalyst 3900 Front View

Figure 21-5: Figure 8-11: Catalyst 3920 Front View

Key Features and Beneﬁts

Catalyst 3900 Features:

The Catalyst 3900 has the following features:

• 20 shielded Token Ring ports for 150-ohm STP or 100-ohm UTP connectivity

• FlexSlot accommodating two expansion modules or one double-wide module for future expansion

• Nine-pin EIA/TIA-232 interface for local console or modem connectivity

• Support for the following bridging modes: SRS, SRB, SRT

• Adaptive cut-through switching

• Automatic 4, 16, and 32 Mbps speed adaptation

• Automatic shared and dedicated adaptation (DTR)

• Two priority queues for multimedia trafﬁc

• TokenChannel switch interconnect

• MAC address and protocol (DSAP/SNAP) ﬁlters

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Cisco WS-C3020 Manual de usuario Pagina 2

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