Populating the topology set

Upon receiving a TC message, the TC repository is updated as follows:

• If no entry is registered in the TC repository on the address of the originator, one is created with validity time and ANSN set according to the TC message header.
• If an entry is registered in the TC repository on the address of the originator and with ANSN lower than the received ANSN, then that entry is updated according to the received TC message.
• If an entry is registered in the TC repository on the address of the originator with an ANSN equal to the received ANSN, then the validity time of the entry is updated.