Hi, thenks for your reply
there is no any relay since it is plain L2 network from the PC to the DHCP server, only betwean LSW3 and LSW1 the customer vlan 10 stacks with the ISP service vlan 500 which is later removed by untag vlan 500 on LSW1 eth0/0/3. then the DHCP request packet with vlan tag 10 comes to R1 eth 0/0/0 where vlan tag 10 terminates eth 0/0/0.10
#
interface Ethernet0/0/0.10
dot1q termination vid 10
ip address 192.168.0.1 255.255.255.0
dhcp select global
#
so the problem using wireshark on Ethernet0/0/0.10 i can see DHCP discover packeges from PC1 arriving but no any replies from R1
if i delete interface Ethernet0/0/0.10
and configure like
nterface Ethernet0/0/0
port lik-type trunk
port trunk allow pass vlan 10
interface vlan-if 10
ip address 129.9.0.1 255.255.255.0
dhcp select global
then it works all right