The Dialup Of The Subscribers Connected To The Ma5600 Fails Due To The Incorrect Setting Of The Broadcast Suppression On The Convergence Switch - Huawei MA5600 Manual

MSAN UA5000 Cases
Total: 2
Note : F--Frame, S--Slot, P--Port(or Virtual Port, such as IMA GROUP,
VLAN ID etc.), The VPI is access-end VLAN ID in VDSL port
6. Encapsulate the port as bridge mode, and the service port can be deleted successfully.
MA5600V3R2D260(config)#encapsulation 0/0/4 vpi 0 vci 35 type bridge llc
Set encapsulation type successfully
Suggestions and
Null
Summary:
1.9 The Dialup of the Subscribers Connected to the MA5600 Fails Due to the Incorrect
Setting of the Broadcast Suppression on the Convergence Switch
The Dialup of the Subscribers Connected to the MA5600 Fails Due to the Incorrect Setting
Title:
of the Broadcast Suppression on the Convergence Switch
ID: SE0000374652
Information
Troubleshooting Cases
Type :
Product Family: Broadband Access
Fault Type:
Keywords: Broadcast suppression, PADI, 678
Permission Level: 04Common Users Permission
Phenomenon Descr
Networking: MA5600---Convergence switch---BRAS
iption:
Symptom: Around 7 p.m. when a large number of subscribers go online, the 678 error is
displayed for the subscribers connected to the MA5600. The services of the subscribers online,
however, are in the normal state.
Alarm Informatio
Null
n:
Cause Analysis: The cause of the "678 the remote PC has no response" error is that the PC does not receive the
PADO packets from the BRAS within a period of time after transmitting the PADI packets. Any
faulty segment of the link between the PC and the BRAS can cause the 678 error when the PADI
packets cannot be transmitted to the BRAS or the PADO packets transmitted from the BRAS are
lost. Therefore, when the 678 error is displayed, the link between the PC and the BRAS needs to
be checked segment by segment to locate the fault.
Handling Proces
1. When the 678 error is displayed, the services of the subscribers online are in the normal state.
s:
Ping the N2000 BMS from the device. It is found that the packets are not lost on the N2000
BMS. It indicates that the physical link is normal.
2. Check the data configuration of the MA5600. It is found that no ACL is bound to the
upstream port and the script of this MA5600 is the same as the scripts of other normal MA5600s.
Therefore, it can be determined that the data configuration of this MA5600 is correct.
3. Check the configuration of the convergence switch. It is found that the port of the MA5600 is
configured with "broadcast-suppression 1", which indicates that when the broadcast packets
occupy more than 1% of the total port bandwidth, the excessive broadcast packets will be
discarded. During the peak hours, the bandwidth occupied by various broadcast packets
(including the normal ARP request packets, PADI packets and the packets transmitted by the PC
after being infected with viruses) exceeds 1% of the total bandwidth. As a result, the PADI
packets transmitted by the new dialup subscribers are discarded, which results in the dialup
failure. Disable the broadcast suppression on the port of the convergence switch, and it is found
that the fault is rectified.
Confidential Information of Huawei. No Spreading without Permission
Chapter 1 MA5600 Cases
Quality Level:
C
Product: SmartAX MA5600
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