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• All-routes explorer reduction
• Broadcast rate protection
• IEEE and IBM Spanning-Tree Protocol
Catalyst 3920 Features:
The Catalyst 3920 provides the following features:
• 24 shielded Token Ring ports for 150-ohm STP or 100-ohm UTP connectivity
• 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
• All-routes explorer reduction
• Broadcast rate protection
• IEEE and IBM Spanning-Tree Protocol
Configurations larger than 20 Token Ring LAN segments can be constructed by:
• Adding 4-port copper or fiber Token Ring modules to the Catalyst 3900 expansion slots for up to eight additional Token
Ring ports per switch.
• Connecting Catalyst 3900 to an OC-3c ATM backbone and ATM LAN Emulation.
• Connecting Catalyst 3900s together via ISL for Token Ring transport over Fast Ethernet.
• Connecting two Catalyst 3900 or 3920 switches together using any of the ports on each switch, to form a TokenChannel.
TokenChannels are two to eight parallel links that connect Catalyst 3900 or 3920 switches. TokenChannels provide a
capacity between the two Catalyst 3900 or 3920 switches of up to 128 Mbps in half-duplex (HDX) mode, and up to
256 Mbps if all ports in the TokenChannel are operating in full-duplex (FDX) mode.
• Connecting two Catalyst 3900 or 3920 switches together using the stack port in a back-to-back configuration.
• Connecting up to eight Catalyst 3900 or 3920 switches together using the stack port, and a Catalyst 3020 Matrix.
To aid in network management, the Catalyst 3900 or 3920 also maintain status information and a variety of statistics. Status
information is available for each port and for each TokenChannel, if defined. Statistics are kept by port, by VLAN, and for
the switch as a whole.
The Catalyst 3900 and 3920 also contain an SNMP MIB-II-compliant management agent that allows a customer-supplied
SNMP-based network management system (such as CiscoView) to remotely monitor and control the Catalyst 3900 or 3920.
In addition, the Catalyst 3900 and 3920 provide Switched Port Analyzer (SPAN) support, which allows you to monitor traffic
on any of the Token Ring ports using a customer-supplied monitoring device such as the Network General Sniffer.
If you need to upgrade the Catalyst 3900 or 3920 software, you can upgrade through the same serial port used for
configuration. The code can be downloaded from a customer-supplied programmable workstation using the Xmodem
protocol. Code upgrades can also be accomplished using Trivial File Transfer Protocol (TFTP).
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