Lease file questions

[Ryan McCain]

I'm using DHCPD 3.0.3 on SLES 10.  

My lease times are set as the following:

default-lease-time 86400;
max-lease-time 604800;

In my leases file I see entries that are older than 7 days (604800 seconds):

-SNIP-
lease 172.20.8.181 {
  starts 2 2007/10/30 08:00:00;
  ends 2 2007/10/30 08:02:00;
  tstp 2 2007/10/30 08:02:00;
  binding state free;
  hardware token-ring 52:41:43:42:d9:01;
  uid "\00042d901-RACcc7e02d940";
  client-hostname "42d901-RACcc7e02d940";
}
lease 172.20.8.182 {
  starts 1 2007/10/29 18:02:45;
  ends 2 2007/10/30 18:02:45;
  tstp 2 2007/10/30 18:02:45;
  binding state free;
  hardware ethernet 00:19:b9:d5:64:0b;
  uid "\001\000\031\271\325d\013";
}
lease 172.20.8.239 {
  starts 2 2007/10/30 08:00:00;
  ends 3 2007/10/31 08:00:00;
  tstp 3 2007/10/31 08:00:00;
  binding state free;
  hardware token-ring 52:41:43:42:d9:01;
  uid "\00042d901-RACcc7e02d940";
}
-SNIP-

..I am under the impression that only active leases should be in the leases file.  Am I missing something?

Also, we don't have token ring on our network (at least we shouldn't).  Is there a reason some of the leases are reporting token ring?

Thanks..