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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