Mypower
S4100
Troubleshooting
Maipu Confidential & Proprietary Information
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14
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124
Common Vlan Troubleshooting
Fault 1: The port type is TRUNK and permits one VLAN, but does not
forward the packets of the VLAN.
Possible Reasons
Judging Methods and Solutions
The VLAN is not created.
Use the show command to view whether the VLAN exists. If
no, use the vlan XX command to create the Vlan.
ACL is applied on the VLAN
and the packet forwarding is
disabled.
Use the show acl command to view whether the ACL is
applied on the VLAN. If yes, cancel the ACL or set the rule to
permit the packets to pass.
Fault 2: The port is configured with one MAC VLAN or IP VLAN or
PROTOCOL VLAN, but it does not take effect.
Possible Reasons
Judging Methods and Solutions
1
．
mac vlan or ip vlan or
protocol vlan is
enabled on the port,
but the rules of mac
vlan or ip vlan or
protocol vlan are not
set globally.
Use the show mac-vlan and show ip-subnet-vlan, show
protocol-vlan commands to view whether the corresponding
rules are set up.
2
．
The port is not
configured to the
corresponding VLAN of
mac vlan or ip vlan or
protocol vlan.
Use the show vlan command to view whether the port
belongs to the corresponding VLAN of mac vlan or ip vlan. If
no, add the port to the corresponding VLAN.
3
．
The packets forwarded
by mac vlan and ip
vlan, protocol vlan do
not match the set
rules.
The global configuration only supports the untag rule, while
the mac-vlan or ip-sub-vlan or protocol vlan packets those
need to be forwarded by the port are tag packets. As a result,
the mac-vlan or ip-sub-vlan or protocol vlan does not take
effect.
Fault 3: Hybrid port cannot switch with TRUNK port.
Possible Reasons
Judging Methods and Solutions
The hybrid port cannot be
directly switched to Trunk
port.
When switching the two port modes, you first need to switch to
the access port, and then switch to the hybrid or trunk.
