Troubleshooting Vlt - Dell Z9000 Configuration Manual

Troubleshooting VLT

To help troubleshoot different VLT issues that may occur, use the following information.
NOTE: For information on VLT Failure mode timing and its impact, contact your Dell Networking
representative.
Table 59. Troubleshooting VLT
Description
Bandwidth monitoring
Domain ID mismatch
Dell Networking OS
Version mismatch
Remote VLT port
channel status
Spanning tree mismatch
at global level
Spanning tree mismatch
at port level
System MAC mismatch
Virtual Link Trunking (VLT)
Behavior at Peer Up
A syslog error message
and an SNMP trap is
generated when the
VLTi bandwidth usage
goes above the 80%
threshold and when it
drops below 80%.
The VLT peer does not
boot up. The VLTi is
forced to a down state.
A syslog error message
and an SNMP trap are
generated.
A syslog error message
is generated.
N/A
All VLT port channels go
down on both VLT
peers. A syslog error
message is generated.
A syslog error message
is generated.
A syslog error message
and an SNMP trap are
generated.
Behavior During Run
Time
A syslog error message
and an SNMP trap is
generated when the
VLTi bandwidth usage
goes above its threshold.
The VLT peer does not
boot up. The VLTi is
forced to a down state.
A syslog error message
and an SNMP trap are
generated.
A syslog error message
is generated.
N/A
No traffic is passed on
the port channels.
A one-time
informational syslog
message is generated.
A one-time
informational syslog
message is generated.
A syslog error message
and an SNMP trap are
generated.
Action to Take
Depending on the traffic
that is received, the
traffic can be offloaded
inVLTi.
Verify the domain ID
matches on both VLT
peers.
Follow the correct
upgrade procedure for
the unit with the
mismatched Dell
Networking OS version.
Use the show vlt
detail and show vlt
brief commands to
view the VLT port
channel status
information.
During run time, a loop
may occur as long as
the mismatch lasts.
To resolve, enable RSTP
on both VLT peers.
Correct the spanning
tree configuration on
the ports.
Verify that the unit ID of
VLT peers is not the
same on both units and
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