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The Catalyst 2820 and Catalyst 1900 are members of an extended network system of stackable, modular LAN and WAN products that increases LAN performance, connects remote offices and users, and provides secure Internet access.
The Catalyst 2820 Series and Catalyst 1900 Series switches shown in Figure 1-2 are Ethernet switches that provide flexible, high-speed configurations for workgroup applications. The Catalyst 2820 Series and Catalyst 1900 Series switches offer 24 or 12 switched 10BaseT ports and a mix of modular and fixed high-speed connections.
The Catalyst 2820 Series and Catalyst 1900 Series vary in their port configurations but share the same firmware and many features. The possible port configurations are the following:
The following features are common to all Catalyst 2820 Series and Catalyst 1900 Series switches:
See the "Concepts" chapter for more information about these features. To implement them via out-of-band management or Telnet, see the "Out-of-Band Management" chapter for more information. If you are using SNMP, the "Standard MIBs and MIB Extensions" section in the "In-Band Management" chapter describes the in-band capabilities of the switch.
The 10BaseT ports shown in Figure 1-3 use RJ-45 connectors to connect to single workstations, 10BaseT hubs, or any 10BaseT-compatible device. The attached devices use standard 10BaseT adapters and wiring. The AUI port, located on the back panel, supports an alternative AUI connection for attachment to a thick coaxial, thin coaxial, or a fiber-optic media transceiver.
Catalyst 1900 100BaseT ports are internally switched to all other ports and can be set to full or half duplex. As shown in Figure 1-3, the Catalyst 1900 can have several fixed 100BaseT port configurations:
The Catalyst 2820 (see Figure 1-4) has two high-speed expansion slots that are compatible with Catalyst 2820 field-pluggable modules and provide high-bandwidth connections to backbones, servers, and other high-performance devices. Each expansion slot is internally switched to all other Catalyst 2820 ports.
The Catalyst 2820 Series and Catalyst 1900 Series LEDs enable you to easily monitor network activity and performance. Figure 1-5 and Figure 1-6 show the location of the LEDs.
This LED indicates whether the system is receiving power and functioning properly. Table 1-1 provides a description of the LED colors and their meanings.
| Visual Indication | System Status |
|---|---|
| Off | System is not powered up. |
| Green | System is operating normally. |
| Amber | System is receiving power but is not functioning properly. |
The redundant power system (RPS) LED shows the RPS status, as shown in Table 1-2. When the RPS is in use, turn off the local power supply by unplugging the AC power cord.
| Visual Indication | RPS Status |
|---|---|
| Off | Off or not installed. |
| Green | RPS operational. |
| Flashing green | The RPS and the local power supply are both powered up. Only one power source can be supplying power to a unit. If you are using the RPS, the local power cord of the switch must not be plugged in. If you are using the local power supply, the RPS can be connected but must be powered down. |
| Amber | RPS not operational. |
These LEDs show the status of an inserted module, as shown in Table 1-3. Check the LEDs on the module itself for the module port status. The A and B LEDs correspond to the left and right expansion slots, respectively.
| Visual Indication | Expansion Slot Status |
|---|---|
| Off | No module is in the slot. |
| Green | Module is operational. |
| Flashing green | Module is running POST. |
| Amber | Module failed POST and is not operational. |
Port LEDs indicate one of the following, depending on the setting you selected using the Mode button:
To change the mode being displayed by the port LEDs, press the Mode button, as shown in Figure 1-7, to highlight in sequence each of the possibilities: STAT (port status), UTL (bandwidth utilization), and FDUP (full-duplex status). The selected mode remains lit for 30 seconds before returning to the default mode of port status.
This LED mode shows the status of switched ports, as shown in Table 1-4.
| Visual Indication | Port Status |
|---|---|
| Off | No link. |
| Green | Link present. |
| Flashing green | Activity; port is transmitting or receiving data. |
| Alternating green-amber | Link fault. Error frames can affect connectivity, and errors such as excessive collisions, CRC errors, and alignment and jabber errors are monitored for a link-fault indication. |
| Amber | Port is not forwarding. For example, this could be because the port was disabled by management, suspended due to an address violation, or suspended by STP due to the presence of network loops. |
A port configured for full-duplex operation must be connected to another full-duplex port. You can display the full-duplex status of a port, as shown in Table 1-5, by pressing the Mode button and releasing it when FDUP is highlighted.
| Visual Indication | Full-Duplex Status |
|---|---|
| Green | Full duplex is operational. |
| Off | Half duplex is operational. |
Utilization LEDs show the current and peak bandwidth utilization of the switch. The peak utilization is recorded in the bandwidth-capture interval. The default setting for this interval is 24 hours; it is recorded each night at midnight.
You can change to the utilization mode by pressing the Mode button until UTL is highlighted. Current bandwidth is shown with a series of lit LEDs ending with a rapidly blinking one. Peak bandwidth is indicated by the right-most solidly lit LED.
Change the bandwidth-capture interval with the Bandwidth Usage Report described in the chapter "Out-of-Band Management."
Table 1-6 shows the bandwidth utilization scale for the Catalyst 2820 and Catalyst 1900 with 24 10BaseT ports. Table 1-7 shows the same scale for the Catalyst 1900 version with 12 10BaseT ports.
| Port LEDs | Mbps |
|---|---|
| 1 to 8 | 0.1 to < 6 |
| 9 to 16 | 6 to < 120 |
| 17 to 24 | 120 to 280 |
| Port LEDs | Mbps |
|---|---|
| 1 to 4 | 0.1 to < 1.5 |
| 5 to 8 | 1.5 to < 20 |
| 9 to 12 | 20 to 140 |
The rear panels, shown in Figure 1-8 and Figure 1-9, contains the following components:
You can configure and manage a Catalyst 2820 Series and Catalyst 1900 Series switch using any SNMP-compatible management station, or you can connect an ASCII terminal to the switch via the EIA/TIA-232 (RS-232) port and use the management console. The management console is also accessible via Telnet. SMT-compatible workstations can support installed Catalyst 2820 FDDI modules.
The management console provides a menu-driven interface for configuring and monitoring your network. The application is password-protected and locks out a user who fails to enter the password within a definable number of attempts. In such a case, the network administrator can be alerted via in-band management.
Most of the statistics and information generated by the switch are available through the management console. You can continue to use it even when the network is down.
The Catalyst 2820 Series and Catalyst 1900 Series are fully manageable by any SNMP-compatible management station.
The products support all pertinent SNMP MIB II variables, the IEEE 802.1d bridge MIB, and a comprehensive set of MIB extensions designed for maximum support of the switch's hub and switching capabilities. The Catalyst 2820 also supports the FDDI MIB and the MIB supporting Catalyst 2820 modules.
The Catalyst 2820 and 1900 SNMP MIBs are supplied in ASCII format for compiling into any SNMP network management system using a general MIB browser. You can display switch information from the following network management platforms:
The Catalyst 2820 Series and Catalyst 1900 Series switches must be configured for SNMP management. To do this, you need to assign an IP address to the switch using the menu described in "IP Configuration" in the "Out-of-Band Management" chapter. Although the switch will immediately register the IP address the first time you assign it, if you change the IP address, it does not take effect until after the switch is reset. You can also use the Bootstrap protocol (BOOTP) described in the "Configuring the Switch for SNMP Management with BOOTP" section in the "In-Band Management" chapter.
You can use the CiscoWorks graphical user interface to configure your Catalyst 2820 Series and Catalyst 1900 Series switches and to generate the same statistics that are available through the management console.
A system of routers, switches, and hubs can be combined to create a high-performance network that extends beyond the main office LAN to connect to branch offices, remote sites, mobile users, and the Internet. Figure 1-10 is an application for an extended network system.
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