37display interface loopbackSyntaxdisplay interface loopback [ brief [ down ] ] [ | { begin | exclude | include } regular-expression ]display interface loopback interface-number [ brief ] [ | { begin | exclude | include } regular-expression ]ViewAny viewDefault level1: Monitor levelParametersinterface-number: Loopback interface number, which can be the number of any existing loopbackinterface. With this argument, this command displays information about a specified loopback interface.brief: Displays brief interface information. If you do not specify this keyword, this command displaysdetailed interface information.down: Displays information about interfaces in the DOWN state and the causes. If you do not specifythis keyword, this command displays information about interfaces in all states.|: Filters command output by specifying a regular expression. For more information about regularexpressions, see the 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.regular-expression: Specifies a regular expression, which is a case sensitive string of 1 to 256 characters.DescriptionUse the display interface loopback command to display information about a loopback interface. If youdo not specify the interface-number argument, this command will display information about all theexisting loopback interfaces.• If you do not specify the loopback keyword, this command displays information about all interfaceson the device.• If you specify the loopback keyword without the interface-number argument, this command displaysinformation about all created loopback interfaces.Related commands: interface loopback.Examples# Display information about interface Loopback0. display interface loopback 0LoopBack0 current state: UPLine protocol current state: UP (spoofing)Description: LoopBack0 InterfaceThe Maximum Transmit Unit is 1536Internet protocol processing : disabledPhysical is LoopbackLast clearing of counters: Never
