Release Notes for the
Catalyst 2820 Series
Enterprise Edition Switches
November 24, 1997
These release notes describe the usage guidelines and restrictions for the Catalyst 2820 Series Enterprise Edition Switches, hereafter referred to as the Catalyst 2820 switches.
Use the following manuals in conjunction with this document:
- Catalyst 2820 Series Installation and Configuration Guide
- Catalyst 2820 Modules User Guide
- Catalyst 2820 ATM Modules Installation and Configuration Guide
- Catalyst 2820 Series and Catalyst 1900 Series Enterprise Edition Software Configuration Guide
This section provides guidelines and restrictions for using the Catalyst 2820 switches.
- Make sure that the port monitoring feature (which is used for diagnostics) remains disabled during normal operation. Enabling the port monitoring feature can degrade the performance of the switch.
- You do not need to reset the switch when assigning an IP address to the switch for the first time. When changing the IP address, you must reset the switch so that the new IP address takes effect. To reset the switch, select Reset System from the System Configuration Menu described in the "Out-of Band Management" chapter of the Catalyst 2820 Series Installation and Configuration Guide.
- When the switch initializes after a reset or when a port is assigned a different VLAN membership, the port experiences the complete Spanning-Tree Protocol (STP) transition, as specified by IEEE 802.1D, even if Port Fast mode is enabled. Once the transition is complete, the Port Fast mode setting is enforced. This process ensures that no temporary loop is formed after a reset and allows STP to safely discover the topology of the network.
- While performing a software upgrade, the switch might not respond to commands for as long as 1 minute. This is normal and correct. If you interrupt the transfer by turning the switch off and on, the firmware could be corrupted. If this happens, follow the procedure described in "Using the Diagnostic Console" in the "Troubleshooting" chapter of the Catalyst 2820 Series Installation and Configuration Guide.
- Switch configuration changes take effect immediately. However, the switch does not write changed parameters to permanent storage for up to 30 seconds. If you turn off the switch before the changed parameters are written to permanent storage, the change does not take effect the next time the system is restarted.
- If trunking mode is enabled after the switch initializes, the switch can take up to 5 minutes to automatically learn VTP information from the network.
- Make sure the management VLAN is not pruned if VTP pruning is enabled. You cannot use IP to manage the switch if the management VLAN is pruned. [CSCdj34652]
- To prevent the formation of undetected loops, nontrunk ports assigned to different VLANs must remain unconnected. Use routers to connect devices residing on different VLANs.
- When the trunking capability is enabled on a high-speed port, the port configuration on the following features is ignored, and the default configuration is used:
- VLAN membership configuration for that port
- STP Port Fast mode (default: disabled on high-speed ports)
- The flooding of unknown unicast and unregistered multicast packets (default: enabled)
- Network port configuration (default: no network port is configured)
- When trunking is disabled once again, these port configurations will function as configured.
- If the switch is directly connected to a terminal or terminal emulator rather than to a modem connection, you must configure the switch to the same baud rate and character format as the terminal or emulator.
- If the switch is dialing out, the configured baud rate of the switch does not change. The Match Remote Baud rate option (auto baud) applies only when the switch is answering an incoming call. In addition, the switch matches to a rate less than or equal to the configured rate. Upon disconnecting from a call, the switch reverts to the last configured baud rate.
- If the optional Cisco 600W redundant AC power system (RPS) is the main power source to the switch, the AC power cord must be disconnected from the switch.
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