DHCP Server cannot send option66 on S9300

Publication Date:  2013-01-29 Views:  292 Downloads:  0
Issue Description
S9300 is DHCP server, which version is V100R003. One IP phone connects to S9300. When testing, IP phone can get IP address successfully. But cannot option66 of TFTP. There is windows server 2008 which has no problem.Configuration is below:
ip pool XXXX
vpn-instance XXXX
network mask
option 42 ip-address
option 66 ip-address 

interface Vlanif200
description voip*gw
ip binding vpn-instance XXXX
ip address
vrrp vrid 8 virtual-ip
vrrp vrid 8 priority 105
dhcp select global

interface GigabitEthernet2/0/22
description voip*test
voice-vlan 200 enable
voice-vlan mode manual
port hybrid tagged vlan 200
undo ndp enable
Alarm Information
Handling Process
1. S9300 as a DHCP Server, IP phone can get ip address successfully. It means network is ok.
2. Check configuration of S9300. And find it is normal.
3.Double check on product documentation. S9300 can support Option1、51、50、52、53、54、57、58、59、6、15、3、44、46. For option66, S9300 can reply to client.
4.We captured packets to further analyze. IP phone send option66 to DHCP Server. Compared with Windows Server 2008, we found Windows Server replied packets using ascii. But S9300 replied with IP address. We doubt IP phone cannot recognize the packet.
5.Add below configuration on S9300 and test it is ok.
option 66 ascii
Root Cause
1.Wrong configuration
2.IP Phone setting problem.
3.Network problem
4.Software Problem.