Enhancements to prefix-limit and accepted-prefix-limit configuration statements, and updates to show bgp neighbor command

The prefix-limit and accepted-prefix-limit configuration statements include the following options: 

• drop-excess -If you include the drop-excess option and specify a percentage, the excess routes are dropped when the number of prefixes exceeds the specified percentage. 
• hide-excess -If you include the hide-excess option and specify a percentage, the excess routes are hidden when the number of prefixes exceeds the specified percentage. The show bgp neighbor command has been enhanced to display the following additional information: 
• Count of prefixes that are dropped or hidden based on network layer reachability information (NLRI) when the maximum allowed prefixes threshold is exceeded. 
• Alerts when a peer starts to drop or hide routes. 
• Configuration details of the prefix-limit and accepted-prefix-limit configuration statements.