| PendingTransaction (uint32_t tid, const Mrib& mrib, bool is_insert) | PendingTransaction | 
Constructor to insert or remove a MRIB entry.
Parameters:
| tid | the transaction ID. | 
| mrib | the MRIB entry to insert or remove. | 
| is_insert | if true, then insert the entry, otherwise remove it. | 
| PendingTransaction (const MribTable& mrib_table, uint32_t tid) | PendingTransaction | 
Constructor to remove all entries.
| uint32_t	 tid () | tid | 
[const]
| const Mrib&	 mrib () | mrib | 
[const]
| bool		 is_insert () | is_insert | 
[const]
| bool		 is_remove_all () | is_remove_all | 
[const]
| void		 update_entry_vif_index (uint32_t vif_index) | update_entry_vif_index |