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Knowledge Base

ONTs doesnt get IP addresses with option82

Publication Date:  2019-07-09  |   Views:  1520  |   Downloads:  0  |   Author:  v84083177  |   Document ID:  EKB1001924851

Contents
Issue Description Alarm Information Handling Process Root Cause Solution Suggestions

Issue Description



Client want to switch users for DHCP L2 with option82. After they enabled option82 the end users does not get IP.


Alarm Information



 

VERSION : MA5600V800R017C10

PATCH   : SPH202
PRODUCT : MA5683T


Handling Process

 
1. Collect the details on the OLT
(config)#scroll
(config)#display patch all
(config)#display board 0
(config)#display time
(config)#display version
(config)#display current-configuration
(config)#display log all
(config)#display log failure
(config)#display alarm active all
(config)#display alarm history all
(config)#display event history all
(config)#diagnose
(diagnose)%%display reboot-record active
(diagnose)%%display reboot-record standby
(diagnose)%%display reset-record
(diagnose)%%display lastwords current
(diagnose)%%display lastwords history
(diagnose)%%display error standby
(config)#undo scroll

 

2. Make sure that after you configured the OLT, to open Option82 in ONT
InternetGatewayDevice.LANDevice.LANHostConfigManagement.X_HW_DHCPOption82Enable
InternetGatewayDevice.LANDevice.LANHostConfigManagement.X_HW_PPPoEPITPEnable


 
3. Check on OLT the configurations of DHCP Option 82, this option is used to enhance user security:
  • RAIO configuration mode: global
  • RAIO mode: user-defined
  • Ethernet access mode:
    • CID format: eth
    • Subrack ID/slot ID/sub-slot ID/port ID: vlanid
  • xPON access mode:
    • CID format: xpon
    • Subrack ID/slot ID/sub-slot ID/port ID: ontid.vlanid
  • RID format: labels of service ports 
huawei(config)#raio-mode user-defined dhcp-option82 huawei(config)#raio-format dhcp-option82 cid eth anid eth frame/slot/subslot/port:vlanid huawei(config)#raio-format dhcp-option82 cid xpon anid xpon frame/slot/subslot/port:ontid.vlanid huawei(config)#raio-format dhcp-option82 rid eth splabel huawei(config)#raio-format dhcp-option82 rid xpon splabel huawei(config)#dhcp option82 enable
 
From the display information, we found that the OLT -> ONT configuration is ok.
 
 
4. During the checking we identify that DHCP L2 is sending the Discover packet, but is not receiving the DHCP reply. 
5.  Trace the peer side of OLT uplink port on DHCP server  and we identify that no packets are received (Wireshark)
6. Client need to check the configuration on Cisco router, in order to allow packets from DHCP option82 to pass. 
 
 
 


Root Cause

Competitor  by default is not accepting DHCP Discovers which already has option 82 parameters. 
 
 Competitor is dropping them, so you have to configure: ip dhcp relay information trusted to allow them on  
Competitor interface

Solution

We isolate the issue in not between ONT-OLT, the client configured the ip dhcp relay information trusted to allow the DHCP option82 packets on Competitor interface.

Suggestions

1. Make sure that after you configured the OLT, to open Option82 in ONT
InternetGatewayDevice.LANDevice.LANHostConfigManagement.X_HW_DHCPOption82Enable
InternetGatewayDevice.LANDevice.LANHostConfigManagement.X_HW_PPPoEPITPEnable

 

2. Verify if there any products between OLT and DHCP server to allow DHCP option82 to pass.

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