Option82 class matching problem

[Oleg Gawriloff]

I'll have very simple setup:
L2 switch with Option82 activated
Cisco Router working as DHCP server (client interfacase on which relay 
is configures is 10.254.254.1/32, interface to dhcp server is 
172.16.2.21/24)
ISC DHCP server with 172.16.2.242/24 address. Address 10.254.254.1 is 
accessible from dhcp server.

ISC setup is:
use-host-decl-names on;
ddns-update-style none;
class "p2626-sha19/9"
{
    match if binary-to-ascii (10, 8, ".", option agent.circuit-id)="0.9";
    log(debug,"Class p2626-sha19/9 matched");
}
subnet 172.16.2.0 netmask 255.255.255.0
{ }
subnet 10.254.254.0 netmask 255.255.255.0
{
    authoritative;
    option routers 10.254.254.1;
    pool { range 10.254.254.128 10.254.254.192; allow members of 
"p2626-sha19/9"; }
}

With empty dhcpd.leases file in log I see following:
[root at albatros2 /usr/local/src/dhcp-4.0.0]# dhcpd -cf 
/usr/local/etc/dhcpd.conf -lf /var/db/dhcpd/dhcpd.leases -d vlan0
Internet Systems Consortium DHCP Server V3.0.7
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Wrote 0 leases to leases file.
Listening on BPF/vlan0/00:1e:0b:5a:d4:17/172.16.2/24
Sending on   BPF/vlan0/00:1e:0b:5a:d4:17/172.16.2/24
Sending on   Socket/fallback/fallback-net
DHCPDISCOVER from 00:17:08:47:54:34 via 10.254.254.1: network 
10.254.254/24: no free leases
 Lease for 10.254.254.192 Switch CID: 0.9 Switch RID: 192.168.0.150
Class p2626-sha19/9 matched
DHCPDISCOVER from 00:17:08:47:54:34 via 10.254.254.1
DHCPOFFER on 10.254.254.192 to 00:17:08:47:54:34 (by171tobookhp) via 
10.254.254.1
DHCPREQUEST for 10.254.254.192 (172.16.2.242) from 00:17:08:47:54:34 via 
10.254.254.1: lease 10.254.254.192 unavailable.
DHCPNAK on 10.254.254.192 to 00:17:08:47:54:34 via 10.254.254.1
 Lease for 10.254.254.192 Switch CID: 0.9 Switch RID: 192.168.0.150
Class p2626-sha19/9 matched
DHCPREQUEST for 10.254.254.192 (172.16.2.242) from 00:17:08:47:54:34 
(by171tobookhp) via 10.254.254.1
DHCPACK on 10.254.254.192 to 00:17:08:47:54:34 (by171tobookhp) via 
10.254.254.1

I've really don't understand why its two DHCPDISCOVER (first one with 
'no free leases'), and why after successfull class matching there is 
'lease unavailable' error and DHCPNAK?
Last two entries at dhcpd.leases:
lease 10.254.254.128 {
  starts 2 2008/12/30 14:14:02;
  ends 2 2008/12/30 14:14:09;
  tstp 2 2008/12/30 14:14:09;
  cltt 2 2008/12/30 14:14:02;
  binding state free;
  hardware ethernet 00:17:08:47:54:34;
  uid "\001\000\027\010GT4";
}
lease 10.254.254.128 {
  starts 2 2008/12/30 14:14:18;
  ends 3 2008/12/31 02:14:18;
  cltt 2 2008/12/30 14:14:18;
  binding state active;
  next binding state free;
  hardware ethernet 00:17:08:47:54:34;
  uid "\001\000\027\010GT4";
  option agent.circuit-id 0:9;
  option agent.remote-id c0:a8:0:96;
  client-hostname "by171tobookhp";
}
Is someone can shed some light on this issue and point me to the right 
direction?


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