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dhcpd leases file question

Can someone explain the difference between "starts, ends, tstp, and tsfp"?

/var/lib/dhcp3/dhcpd.leases

Quote:

lease 192.168.1.104 {
starts 2 2008/08/26 04:07:48;
ends 3 2008/08/27 04:07:48;
tstp 3 2008/08/27 04:07:48;
binding state free;
hardware ethernet 00:22...;
}
lease 192.168.1.103 {
starts 0 2008/09/07 23:17:32;
ends 1 2008/09/08 23:17:32;
tstp 1 2008/09/08 23:17:32;
binding state free;
hardware ethernet 00:07...;
}
lease 192.168.1.102 {
starts 4 2008/09/11 23:37:08;
ends 5 2008/09/12 23:37:08;
tstp 5 2008/09/12 23:37:08;
binding state active;
next binding state free;
hardware ethernet 00:1a...;
uid "\001\000....";
client-hostname "Antec2";
}

dhcpd leases file question

starts, ends, tstp and tsfp:

The start and end time of a lease are recorded using the starts and ends statements. The tstp statement is specified if the failover protocol is being used, and indicates what time the peer has been told the lease expires. The tsfp statement is also specified if the failover protocol is being used, and indicates the lease expiry time that the peer has acknowledged.