What causes line protocol down?

What causes line protocol down?

The line protocol being down indicates a clocking or framing problem. Probable reasons for this are encapsulation and clock rate mismatches. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command.

What are two possible causes if a serial interface is up and the line protocol is down?

if the Line status is up,a protocol status of down usually is caused by mismatched data link layer configuration For an example serial interfaces has their combination when one router has configured to use PPP(Point_to_Point Protocol) and other remains the default HDLC (Higher_level Data Link Control) configuration and …

What is the reason that the interface status is administratively down line protocol down?

The CLI status output “Serial0/0/0 is administratively down, line protocol is down” means that either the router interface is configured with the “shutdown” interface configuration command or a duplicate IP address exists. If there are duplicate addresses, resolve the conflict by changing one of the IP addresses.

How can I make a simple network?

In Part 1, you will cable the devices together according to the network topology.

1. Step 1: Power on the devices. Power on all devices in the topology.
2. Step 2: Connect the two switches.
3. Step 3: Connect the PCs to their respective switches.
4. Step 4: Visually inspect network connections.

What type of interface has no physical port associated with it?

loopback interface
The loopback interface is a logical interface internal to the router. It is not assigned to a physical port and can therefore never be connected to any other device. It is considered a software interface that is automatically placed in an “up/up” state, as long as the router is functioning.

What do you do for the interface showing administratively down?

You can mark an interface administratively down with the “shutdown” command, and turn it on with the “no shutdown” command. If an interface is shut down, it will display administratively down when using the “show interface” command. REMEMBER TO DO A “NO SHUTDOWN” COMMAND WHEN YOU HAVE CONFIGURED A DEVICE….

What are line protocols?

line protocol A formally specified set of possible bit sequences that will guarantee that two ends of a communication link will be able to pass information between them in an understandable way. A number of standards have been devised for the implementation of such protocols.

Why do you enter the no shutdown command Cisco?

The no shutdown command enables an interface (brings it up). This command must be used in interface configuration mode. It is useful for new interfaces and for troubleshooting. When you’re having trouble with an interface, you may want to try a shut and no shut.

Why is fastethernet0 / 0 line protocol down?

In my experience when a cable is not plugged in the Ethernet/Fast Ethernet will show to be line up line protocol down, which is the exact symptom that you report. I suspect that if someone physically checks the connection that they will find that the interface is not connected to a switch or anything.

Why is my Cisco Ethernet up and down?

Cisco ethernet interfaces are normally down / down if they don’t have a link. If you’re seeing up / down, the most likely causes are: is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?

Why is the line Protocol on my router down?

CLICK HERE to learn more details 05-09-2011 02:06 AM 05-09-2011 02:06 AM The line protocol is still down. I already did a “no shutdown” command on serial 2/0 interface of the router. I can’t ping to the IP address on the serial interface. I’m using Cisco Packet Tracer 5.3.1 Interface IP-Address OK? Method Status Protocol

How is line protocol down ( Cisco packet tracer )?

Re: Line Protocol is down (Cisco Packet Tracer) If you connected a DCE cable to an interface, then no matter what, that interface must provide clocking and in turn be of type DCE. See the below. Interface Ser0/0/0 is connected to a DCE cable, therefore provides clocking and is defined as type DCE.