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February 18, 1997
These release notes describe the new features, modifications, and known problems in the Catalyst 2820 and the Catalyst 1900 Version 5.33 firmware. This firmware runs on the Catalyst 2820 and the Catalyst 1900 only.
The product documentation for these products is as follows:
Catalyst 2820 Series and Catalyst 1900 Series Installation and Configuration Guide
Catalyst 2820 Modules User Guide
Catalyst 2820 Series and Catalyst 1900 Series MIB Reference Manual
This release adds support for the Cisco Discovery Protocol (CDP), the Cisco Group Management Protocol (CGMP), and Remote Monitoring (RMON).
CDP allows network managers to obtain an accurate picture of the network at any time. By gathering information about the types of devices in the network, the links between those devices, and the number of interfaces within each device, CDP enables network management applications to display a graphical topology map of the network. Detailed information about the connections between devices is also available.
CGMP reduces the unnecessary flooding of IP multicast packets. The switch receives data via the CGMP from a Cisco router that identifies clients that should receive certain IP multicast packets. With this information, the switch limits the transmission of the IP multicast packets to those clients identified by the router.
The Catalyst 2820 and the Catalyst 1900 support four RMON groups as defined by RFC 1757. As recommended by the RFC, default statistics and history rows are created automatically when you start the system. You can obtain information about these four groups using any SNMP management application. The four supported RMON groups are described in Table 1.
| Group Name | Description | |
| Statistics | Collects statistics for a specific interface. For example, you could use this group to determine how many error packets have been seen on a given port. By default, two rows of statistics are established, one for each high-speed port. | |
| History | Collects statistics within a given interval for a specific interface. By default, two rows of history statistics are established for each high-speed port. One row is for a long-term interval of 30 minutes; the other row is for a short-term interval of 30 seconds. | |
| Alarm | Generates an alarm according to user-defined thresholds. You could, for example, set an alarm for those times when CRC errors exceeded a predefined limit. | |
| Event | Generates traps and log entries based on the configuration of alarm entries. | |
The following modifications are included in Version 5.33:
This section applies to users upgrading from firmware Version 5.25 to Version 5.33.
If you have customized any Version 5.25 parameters, the upgrade to Version 5.33 resets these parameters to their factory defaults. These parameters need to be reset to your customized settings after the upgrade. The default values of the configurable parameters in Version 5.33 have not changed from Version 5.25.
The following list contains the parameters and factory defaults of those parameters that return to their factory defaults when you upgrade to Version 5.33 from 5.25.
| Parameter | Default Value |
| Broadcast threshold (BC's received / sec) | 500 |
| Broadcast re-enable threshold | 250 |
| Spanning-Tree Protocol | Enabled |
| Generate alert on address violation | Enabled |
| Action upon address violation | Suspend |
| Switching mode | FastForward |
| Use of store-and-forward for multicast | Disabled |
| Capturing frames to the monitor | Disabled |
| Monitor port assignment | None |
| MIB object sysConfigHigherProtocolMonitor | Disabled |
| Authentication trap generation | Enabled |
| LinkUp/LinkDown trap generation | Enabled |
| Accept upgrade transfer from other hosts | Enabled |
| Action upon exceeding broadcast threshold | Ignore |
| Generate alert when threshold exceeded | Disabled |
| RS232 data bits | 8 |
| RS232 stop bits | 1 |
| RS232 parity setting | None |
| RS232 match remote baud rate (auto baud) | Enabled |
| RS232 auto answer | Enabled |
| MIB object IP time to live | 255 |
| Help level setting of the management console | Novice |
| Overlapping of VLANs permitted | Disabled |
| Capture-time interval for the bandwidth-usage report | 24 hours |
| Status of a SNMP write manager | Enabled |
| Status of a SNMP trap manager | Enabled |
| Management console inactivity timeout | None |
| Password intrusion threshold | 3 attempts |
| Silent time upon intrusion detection | None |
| RS232 baud rate | 9600 |
| Time delay between dial out attempts | 300 seconds |
| Address aging time | 300 seconds |
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