| Interest Operation Code |
| Input: Interest, Face |
| Output: void |
| delete expired entries of PIT; // call DeleteEntryOfPIT( ); |
| set -Flag = 0; // forwardingFlag |
| for each index from Seg to Seg + Seg −1 |
| generate Interest such that |
| Interest.name == Interest.name and |
| Interest.Seg == Interest.Seg; |
| find an entry () of PIT relevant to Interest; |
| if there is no, add a new entry to its PIT for Interest; |
| else |
| if Face isn’t in .face, add Face to .face; |
| if .Flag > 0 and .Flag == 1, set .Flag = 0; |
| else stop handling Interest; |
| |
| find an entry () of CS relevant to Interest |
| if there is , then |
| transmit through .face; |
| if .Flag == 1, then set .Flag = 1. |
| else delete from PIT; // general Interest |
| |
| else set -Flag = 1; |
| if .Flag > 0 and .Flag == 0, set -Flag = 1; |
|
| find a proper forwarding face referring to FIB table; |
| if Seg == 1, forward Interest through the face; |
| else if -Flag == 1, forward Interest via the face; |
| else stop handling Interest; |
