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Release Notes for the Catalyst 1900 and Catalyst 2820 Series Switches, Version 9.00.06
OL-2901-01
Usage Guidelines
• 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
and matches a rate less than or equal to the configured rate. When the call is over, the switch reverts
to the last configured baud rate.
• Be sure that the port monitoring feature (used for diagnostics) is disabled during normal operation.
Enabling the port monitoring feature can degrade the performance of the switch.
• Bridge group configuration is supported on the management console and the CLI, but not on the
switch manager.
• When you have bridge groups enabled, the switch manager displays information only for bridge
group 1.
• Do not connect a port that belongs to more than one bridge group to another port in any of those
bridge groups; this causes a network loop.
• VLAN configuration is supported on the management console and the CLI, but not on the switch
manager.
• Fast EtherChannel configuration is supported on the switch manager and the CLI, but not on the
management console.
• When you have VLANs enabled, the switch manager displays information only for VLAN 1.
• The switch resets when you change from using VLANs to bridge groups and vice versa, and any
configured options revert to the default settings. You will need to reconfigure the options that you
need for VLANs or bridge groups.
Use the System Configuration menu, CLI, or SNMP to change from VLANs to bridge groups and
vice versa.
• When the switch initializes after a reset or when a port is assigned a different VLAN membership,
the port experiences the complete STP transition, as specified by IEEE 802.1D, even if the Port Fast
mode is enabled. When 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.
• If the trunking mode is enabled after the switch initializes, the switch can take up to 5 minutes to
automatically learn VTP information from the network.
• To prevent the formation of undetected loops, nontrunk ports assigned to different VLANs must not
be connected to each other. Use routers to connect devices residing on different VLANs.
• When the trunking capability is enabled on a high-speed port and the default configuration is used,
the port configuration on these features is ignored:
–
VLAN membership configuration for that port.
–
STP Port Fast mode (default: disabled on high-speed ports).
–
Flooding of unknown unicast and unregistered multicast packets (default: enabled).
–
Network port configuration (default: no network port is configured). When trunking is disabled,
the port configurations function as configured.
• Switch configuration changes take effect immediately. However, the switch requires 30 seconds to
write changed parameters to permanent storage. If you turn off the switch too soon, the changes to
the switch configuration are lost the next time the system is restarted.