Table of Contents
　　
　　Command Descriptions
　　
　　address-violation
　　autobaud
　　back-pressure
　　banner motd
　　bridge (forwarding-time)
　　bridge-group
　　bridge-group (allow-overlap)
　　bridge-group (enable)
　　bridge (hello-time)
　　bridge (max-age)
　　bridge (priority)
　　cdp (advertise-v2)
　　cdp (enable)
　　cdp (holdtime)
　　cdp (timer)
　　cgmp
　　cgmp (hold-time)
　　cgmp (leave-processing)
　　cgmp (remove)
　　cgmp (reserved)
　　clear (cgmp)
　　clear (dns-cache)
　　clear (counters)
　　clear (mac-address-table)
　　clear (uplink-fast statistics)
　　clear (vtp statistics)
　　cluster
　　configure
　　copy (nvram tftp)
　　copy (tftp)
　　copy (xmodem)
　　databits
　　delete (nvram)
　　delete (vtp)
　　description
　　disable
　　duplex
　　ecc
　　enable
　　enable (password)
　　enable (secret)
　　enable (use-tacacs)
　　end
　　exit
　　fddi (authorization)
　　fddi (auth-string)
　　fddi (notify-timer)
　　fddi (novell-snap-translation)
　　fddi (unmatched-snap-translation)
　　hostname
　　interface
　　ip (address)
　　ip (default-gateway)
　　ip (domain-name)
　　ip (http port)
　　ip (http server)
　　ip (mgmt-vlan)
　　ip (name-server)
　　line console
　　login (tacacs)
　　mac-address-table (aging-time)
　　mac-address-table (permanent)
　　mac-address-table (restricted static)
　　menu
　　modem (dialin)
　　modem (init-string)
　　monitor-port
　　monitor-port (monitored)
　　monitor-port (port)
　　multicast-store-and-forward
　　network-port
　　pagp-port-priority
　　parity
　　password-thresh
　　ping
　　port (block)
　　port-channel (mode)
　　port-channel (preserve-order)
　　port-channel (template-port)
　　port secure
　　port secure (clear)
　　reload
　　reload (in)
　　rip
　　service (config)
　　session
　　show (bridge-group)
　　show cdp (interface)
　　show cdp (neighbors)
　　show (cgmp)
　　show cluster
　　show (history)
　　show (interfaces)
　　
　　Command Descriptions
　　This chapter is a command-by-command description of the firmware version 9.00 CLI commands for the Catalyst 1900 series and Catalyst 2820 series switches.
　　address-violation
　　Use the address-violation global configuration command to specify the action for a port address violation. Use the no address-violation command to set the switch to its default value (suspend).
　　address-violation {suspend | disable | ignore}
　　no address-violation
　　Syntax Description
　　suspend Suspend port on address violation. A suspended port is temporarily disabled until a certain number of frames with the proper address is received.
　　disable Disable port on address violation.
　　ignore Ignore address violation.
　　
　　Default
　　The port is suspended on address violation.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　An address violation occurs when a secured port receives a source address that has been assigned to another secured port or when a port tries to learn an address that exceeds the address-table size limit.
　　Example
　　This command causes the switch to disable the port on address violation.
　　hostname(config)# address-violation disable
　　Related Commands
　　port secure
　　show (port system)
　　autobaud
　　Use the autobaud line-configuration command to enable remote baud-rate matching. Use the no autobaud command to disable remote baud-rate matching.
　　autobaud
　　no autobaud
　　Syntax Description
　　This command has no arguments or keywords.
　　Default
　　Remote baud-rate matching is enabled.
　　Command Mode
　　Line configuration
　　Example
　　This example shows how to enable remote baud-rate matching.
　　hostname(config-line)# autobaud
　　Related Commands
　　databits
　　line console
　　modem (dialin)
　　parity
　　show (line)
　　show (terminal)
　　speed
　　stopbits
　　terminal
　　back-pressure
　　Use the back-pressure global configuration command to enable back pressure. Use the no back-pressure command to disable back pressure.
　　back-pressure
　　no back-pressure
　　Syntax Description
　　This command has no arguments or keywords.
　　Default
　　Back pressure is disabled.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　When the back-pressure command is enabled, the switch forces a collision when there is no buffer to receive frames. This collision causes the transmitter to retransmit dropped frames immediately, increasing performance. The command is valid only for a 10BaseT port operating in half-duplex mode.
　　Example
　　This example shows how to enable back pressure.
　　hostname(config)# back-pressure
　　Related Commands
　　configure
　　duplex
　　show (interfaces)
　　show (port system)
　　banner motd
　　Use the banner motd global configuration command to set the message-of-the-day (MOTD) banner. Use the no banner motd command to remove the banner.
　　banner [motd] d message d
　　no banner [motd]
　　Syntax
　　motd Optional command acronym for "message of the day."
　　d Delimiting character---a pound sign (#), for example. Do not use the delimiting character in the banner message.
　　message Message text up to 400 characters or 20 lines.
　　
　　Default
　　No MOTD is set.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　When configuring a multiline banner, the multiline help prompt displays after you enter the first line of the banner:
　　Enter TEXT message. End with the character c
　　
　　where c is the delimiting character you choose.
　　When a MOTD banner is set, it displays at the login screen to the serial port console and all telnet connections (except the rcommand connections from a command switch). The maximum size of the banner is 400 characters or 20 lines, whichever is reached first.
　　Examples
　　This example sets the MOTD banner to Empowering the Internet Generation.
　　hostname(config)# banner motd # Empowering the Internet Generation #
　　
　　This example shows how to set the MOTD banner message with line feeds.
　　hostname(config)# banner #
　　
　　Enter TEXT message. End with the character #.
　　Line 1 is now up.
　　Line 2 is still down.
　　#
　　
　　This example shows how to remove the MOTD banner.
　　hostname(config)# no banner motd
　　Related Commands
　　None
　　bridge (forwarding-time)
　　Use the bridge forwarding-time global configuration command to set the Spanning-Tree Protocol (STP) forward-delay time for a particular bridge group. Use the no bridge forwarding-time command to reset the forward-delay time to its default value.
　　bridge bridge-group forwarding-time time
　　no bridge bridge-group forwarding-time
　　Syntax Description
　　bridge-group Number from 1 to 4.
　　time Number from 4 to 30 seconds.
　　
　　Default
　　The default is 15 seconds.
　　Command Mode
　　Global configuration
　　Usage Guidelines
　　This command is available only when bridge groups are enabled.
　　Example
　　The following example shows how to set the forward-delay time to 10 seconds for bridge-group 1.
　　hostname(config)# bridge 1 forwarding-time 10
　　Related Commands
　　bridge (hello-time

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