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MSAN UA5000 Cases
networking of this case, assume that the PADO packet of PVC 0/33 is received first by the
modem, the modem adapts to PVC 0/33 and does not adapt to other PVCs any more.When the
PC of the user sends the PADR packet, only PVC 0/33 is available now. After the PPP packet
exchange, the user authentication packet is sent to the RADIUS server. On the RADIUS server,
the user account is already bound to VLAN 10, and now the user authentication packet sent
through PVC 0/33 carries VLAN ID 20, the 691 error occurs consequently.
2. If the dial-up service is not enabled for the four VLANs but is enabled for only VLAN 10
instead on the BRAS, the BRAS does not respond to the packets sent through the other three
PVCs, and responds with the PADO packet to the packet sent through the correct PVC only.
Therefore, in normal conditions, the user can dial up successfully. If the 678 error occurs in such
a case, check which PVC is currently effective on the modem. If PVC 0/32 (carrying the dial-up
service) is currently not effective, it is natural that the 678 error occurs, because the dial-up
service is not enabled for other PVCs on the BRAS. Before the user dials up, a certain PVC has
received a packet (a broadcast packet or protocol packet from the network) sent from the
DSLAM port. As a result, a link is set up between the modem and this PVC, and the modem
does not negotiate with other PVCs. Hence, the 678 error occurs.
Handling Proces
The solutions to such problems are:
s:
1. On the single-PVC modem, configure only one PVC and delete the other PVCs. For
multi-PVC users, configure the multi-PVC service on the multi-PVC modem.
2. The DSLAM of certain versions supports the deactivating of the PVC. Upgrade the DSLAM
to such a version and deactivate the PVCs that are currently not used.
3. Replace the single-PVC modem with a multi-PVC modem.
Suggestions and
The problems discussed in this case occur in the ONE HOME service of China Telecom. In
Summary:
many areas, the multi-PVC service is configured for users whose modems currently do not
support the multi-PVC service. Because of the implementation mechanism of certain single-PVC
modems, the problems occur. The problems do not relate to the device quality.
1.6
The Loop Detection Function Fails Because the Modem Does Not Transmit the BPDU
Packet for the Loop Detection
The Loop Detection Function Fails Because the Modem Does Not Transmit the BPDU
Title:
Packet for the Loop Detection
ID: SE0000383809
Information
Troubleshooting Cases
Type :
Product Family: Broadband Access
Fault Type: ADSL Access Service
Keywords: Loop detection failure
Permission Level: 03Equipment Users Permission
Phenomenon Descr
Networking: MA5600-S8505-BAS-MAN
iption:
Fault symptom: The S8505 reports an alarm indicating that the loop exists on the port of the
MA5600. The loop detection function is enabled on the MA5600, but no loop alarm is reported.
The user reports that the 678 error is prompted during the dialing.
Alarm Informatio
Null
n:
Cause Analysis: 1. The loop detection function of the MA5600 is not enabled.
2. The loop detection intervals of the MA5600 and the S8505 are different.
3. The S8505 reports a false loop alarm.
Confidential Information of Huawei. No Spreading without Permission
Chapter 1 MA5600 Cases
Quality Level:
C
Product: SmartAX MA5600
7
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