https://supportforums.cisco.com/t5/lan-switching-and-routing/can-t-delete-line-2/td-p/2148623?dtid=osscdc000283请参考这个说明,line 2无法被删除;
This line cannot be removed. Line 2 is reserved for 2nd core console for all of the ISR G2 platforms. The line is used to provide a console to the embedded service engine on these platforms.
Conditions: The addition of this line will be seen on all ISR G2 routers if the version being run has the code which added the console for the second core.
Workaround: There is no workaround and this line cannot be removed.
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