Layer 2 Network Communication Failures; Layer 2 Communication By Vlans Is Not Possible - Alaxala AX6700S series Troubleshooting Manual

3. Troubleshooting Functional Failures During Operation

3.6 Layer 2 network communication failures

3.6.1 Layer 2 communication by VLANs is not possible

If Layer 2 communication is not possible when VLANs are used, isolate the cause of the problem
according to the failure analysis method described in the table below.
(1) Checking the VLAN status
Execute the
show vlan
the status of the VLAN. The following describes the items that must be checked for each VLAN
type.
(a) Items checked in common for all VLAN types
Check whether the VLAN is configured correctly on the port.
Check whether the correct mode is set for the port. If the expected port does not belong to the
default VLAN (VLAN ID 1), check whether:
• A port VLAN other than VLAN ID 1 is specified for the access VLAN or native VLAN.
• The default VLAN is set in
• The port is specified as a mirror port.
Check whether IEEE 802.1X VLAN-based authentication (static), Web authentication (fixed
VLAN mode), or MAC-based authentication is set only for some of the VLANs configured
for trunk ports.
(b) For protocol VLANs
When you are using a protocol VLAN, execute the
protocol has been configured correctly.
# show vlan
:
VLAN ID:100
Protocol VLAN Information
EtherType:0800,0806
Learning:On
:
(c) For MAC VLANs
When you are using a MAC VLAN, execute the
sure the MAC addresses allowed for communication that uses the VLAN have been set
correctly. In the example below, the value enclosed in parentheses indicates the functionality
used to register the MAC address.
[Functionality]
static
dot1x
: The MAC address is set by Web authentication.
wa
vaa
# show vlan mac-vlan
VLAN ID:100
0012.e200.0001 (static)
0012.e200.0003 (static)
46
command or the
Type:Protocol based
Name:ipv4
LLC:
Uplink-VLAN:
: The MAC address is set in the configuration.
: The MAC address is set by the IEEE 802.1X functionality.
: The MAC address is set by an authentication VLAN.
:
MAC Counts:4
command with the
show vlan
for trunk ports.
allowed vlan
show vlan
Status:Up
Snap-EtherType:
Uplink-Block:
show vlan mac-vlan
0012.e200.00:02 (static)
0012.e200.00:04 (dot1x)
parameter to check
detail
command and make sure the
Tag-Translation:
command and make