The terminology null modem for the situation where two computers communicate directly is so often used nowadays, that most people don’t realize anymore the origin of the phrase and that a null modem connection is an exception, not the rule. One of the main uses of serial communication today where no modem is involved-a serial null modem configuration with DTE/DTE communication-is not so well defined, especially when it comes to flow control. For your information, DTE means data terminal equipment (computers etc.) where DCE is the abbreviation of data communication equipment (modems). The standards show the use of DTE/DCE communication, the way a computer should communicate with a peripheral device like a modem.
The way this type of communication can be performed is pretty well defined in standards. One of the oldest and most widely spread communication methods in computer world. If you experience this issue, a router reload will resolve this problem.Serial communications with RS232. Basically this warning is letting you know that once you remove a logical or sub-interface using the no interface command there is the potential for some of the previous configuration to return when re-creating the same interface. This has been an issue with Cisco IOS for years and it has yet to be fixed. Once you’ve removed the interface you’ll notice a warning that not all config may have been removed and may reappear after reactivating the logical-interface/sub-interface. %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to down %LINK-5-CHANGED: Interface Loopback1, changed state to administratively down % Not all config may be removed and may reappear after reactivating the logical-interface/sub-interfaces
Router(config-if)# no interface loopback 1
Objective 2 request that we remove the Loopback 1 interface, you can remove loopback interfaces by negating the interface command using the no interface loopback # command as shown below As per the objective you’re required to configure the IP address 10.233.21.251/24 on this interface as shown below
%LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to upĪfter the interface is created you’ll notice the interface changes to state up instantly. Configuration shown below Įnter configuration commands, one per line. To create a loopback interface you need to navigate to global configuration mode and execute the command interface loopback # The interface is created automagically.
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