2Parametersmaster: Specifies the internal transmission clock (the master clock mode).slave: Specifies the line clock (the slave clock mode).DescriptionUse the clock command to specify the clock signal to be adopted by the current ATM interface.Use the undo clock command to restore the default.By default, an ATM interface uses line clock signal (slave).When two routers are connected back-to-back through ATM interfaces, you must configure the clockmode to master on one side and to slave on the other side.NOTE:• To have an ATM interface work in master clock mode, make sure that the clock modes of all the ATMinterfaces sharing the same slot are set to master.• The effect of this command applies to both ATM main interface and subinterface. However, thecommand is available only in ATM main interface view.Related commands: display atm interface.Examples# Specify interface ATM 3/1/1 to operate in master clock mode. system-view[Sysname] interface Atm 3/1/1[Sysname-Atm3/1/1] clock masterdisplay atm interfaceSyntaxdisplay atm interface [ atm { interface-number | interface-number.subnumber } ] [ | { begin | exclude |include } regular-expression ]ViewAny viewDefault level1: Monitor levelParametersinterface-number: Number of an ATM main interface.interface-number.subnumber: Number of an ATM subinterface, in the range of 0 to 1023.interface-number is the number of the ATM main interface.|: Filters command output by specifying a regular expression. For more information about regularexpressions, see Fundamentals Configuration Guide.begin: Displays the first line that matches the specified regular expression and all lines that follow.exclude: Displays all lines that do not match the specified regular expression.include: Displays all lines that match the specified regular expression.