Flap and MBB counter for LSP

The show mpls lsp extensive command introduces the following two counters for LSP on primary routing engine only:

• Flap counter - Counts the number of times an LSP flaps down or up.
• MBB counter - Counts the number of times an LSP incurs MBB.

The clear mpls lsp counters command resets the flap and the MBB counter to zero.