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The Service Fails When the Switch of Company C Is Interconnected to the HG813e Because of the Incorrect Data Configuration of the Switch

Publication Date:  2012-07-25 Views:  47 Downloads:  0
Issue Description
In the implementation of the EPON service, the MA5680T whose version is MA5680V800R105C32B056 functions as the OLT, the HG813e functions as the terminal, and a low-end switch (2900) of company C is cascaded to the HG813e. A PC is connected to the switch 2900 of company C. When a user accesses the Internet in the dialup mode, the 678 error is displayed, that is, the remote computer does not give any response.
When the Quidway S2000 is used to replace the switch 2900 of company C, the user can access the Internet in the dialup mode normally. 
 
Alarm Information
Null
Handling Process
1. Replace the network cable between the HG813e and switch 2900 of company C and access the Internet in the dialup mode. The fault, however, persists.
2. Change the FE port modes of the HG813e and switch 2900 of company C to self-adaptive and access the Internet in the dialup. The fault, however, persists.
3. Check the configuration of the switch 2900 of company C. The configuration is as follows:
interface FastEthernet0/1
description line to bohao
switchport access vlan 700
interface FastEthernet0/24
description lin to"huawei_2403H"
4. Run the following commands on the switch 2900 of company C:
ZXJF_2900_01(config-if)#switchport mode trunk
ZXJF_2900_01(config-if)#switchport trunk allowed vlan all
The Internet still fails to be accessed in the dialup mode.
5. Run the following commands on the switch 2900 of company C:
ZXJF_2900_01#show arp
00:55:50: %LINK-4-ERROR: FastEthernet0/24 is experiencing errors
ZXJF_2900_01#
00:56:56: %LINK-4-ERROR: FastEthernet0/24 is experiencing errors
00:58:02: %LINK-4-ERROR: FastEthernet0/24 is experiencing errors
Run the following commands on the trunk port:
ZXJF_2900_01(config-if)#switchport trunk encapsulation ?
dot1q Interface uses only 801.1q trunking encapsulation when trunking
isl Interface uses only ISL trunking encapsulation when trunking
ZXJF_2900_01(config-if)#switchport trunk encapsulation dot1q
The HG813e transparently transmits the 802.1 packets only. The trunk port of the switch 2900 of company C, however, transparently transmits packets encapsulated in the dot1q and isl modes. As a result, the interconnection fails. Run the preceding commands on the trunk port of the switch 2900 of company C so that the packets are encapsulated in the dot1q mode. As a result, the problem is solved and the Internet can be accessed in the dialup mode. 
 
Root Cause
1. The network cable between the HG813e and switch 2900 of company C is faulty.
2. The FE port modes of the HG813e and switch 2900 of company C do not match.
3. The data configuration of the switch 2900 of company C is incorrect. 
 
Suggestions
Null

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