Administrator Guide
switchport
channel-member tengigabitethernet 1/18,22
no shutdown
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 76. Troubleshooting VLT
Description Behavior at Peer Up Behavior During Run
Time
Action to Take
Bandwidth monitoring 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%.
A syslog error message
and an SNMP trap is
generated when the VLTi
bandwidth usage goes
above its threshold.
Depending on the traffic
that is received, the traffic
can be offloaded inVLTi.
Domain ID mismatch
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.
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.
Verify the domain ID
matches on both VLT
peers.
Dell Networking Version
mismatch
A syslog error message is
generated.
A syslog error message is
generated.
Follow the correct
upgrade procedure for
the unit with the
mismatched Dell
Networking version.
Remote VLT port channel
status
N/A N/A Use the show vlt
detail and show vlt
brief
commands to
view the VLT port
channel status
information.
Spanning tree mismatch
at global level
All VLT port channels go
down on both VLT peers.
A syslog error message is
generated.
No traffic is passed on
the port channels.
A one-time informational
syslog message is
generated.
During run time, a loop
may occur as long as the
mismatch lasts.
To resolve, enable RSTP
on both VLT peers.
Virtual Link Trunking (VLT) 988