VRF Selection Error

C.

The command "no vrf selection source 172.16.0.0 255.255.0.0 vrf VRF1" is used to remove a VRF selection entry for a specific source IP address range and VRF instance. However, the error message indicates that the command failed to execute successfully.

Let's examine each answer option to determine which action caused the error message:

A. the entry of an inconsistent IP address and mask for VRF Selection - This option suggests that the error is caused by an invalid IP address or subnet mask. However, the command syntax for VRF selection requires a valid IP address and subnet mask, so this option is unlikely to be the cause of the error.

B. an attempt to configure a VRF instance on an interface that already has VRF Selection configured - This option suggests that the error is caused by attempting to configure a VRF instance on an interface that already has VRF selection configured. However, the command in question is used to remove a VRF selection entry, not configure one. Therefore, this option is unlikely to be the cause of the error.

C. an attempt to remove a VRF Selection entry that does not exist - This option suggests that the error is caused by attempting to remove a VRF selection entry that does not exist. This is a plausible explanation for the error message, as the command is used to remove an existing VRF selection entry. If the entry does not exist, the command would fail to execute.

D. an attempt to configure a VRF Selection table that does not exist - This option suggests that the error is caused by attempting to configure a VRF selection table that does not exist. However, the command syntax is used to remove an existing VRF selection entry, not create a new one. Therefore, this option is unlikely to be the cause of the error.

In conclusion, the most likely cause of the error message is option C: an attempt to remove a VRF selection entry that does not exist.