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Description Behavior at Peer Up Behavior During Run
Time
Action to Take
that the MAC address is
the same on both units.
Unit ID mismatch
The VLT peer does not
boot up. The VLTi is
forced to a down state.
A syslog error message
is generated.
The VLT peer does not
boot up. The VLTi is
forced to a down state.
A syslog error message
is generated.
Verify the unit ID is
correct on both VLT
peers. Unit ID numbers
must be sequential on
peer units; for example,
if Peer 1 is unit ID “0”,
Peer 2 unit ID must be
“1’.
Version ID mismatch A syslog error message
and an SNMP trap are
generated.
A syslog error message
and an SNMP trap are
generated.
Verify the Dell
Networking OS versions
on the VLT peers is
compatible. For more
information, refer to the
Release Notes for this
release.
VLT LAG ID is not
configured on one VLT
peer
A syslog error message
is generated. The peer
with the VLT configured
remains active.
A syslog error message
is generated. The peer
with the VLT configured
remains active.
Verify the VLT LAG ID is
configured correctly on
both VLT peers.
VLT LAG ID mismatch
The VLT port channel is
brought down.
A syslog error message
is generated.
The VLT port channel is
brought down.
A syslog error message
is generated.
Perform a mismatch
check after the VLT peer
is established.
Reconfiguring Stacked Switches as VLT
To convert switches that have been stacked to VLT peers, use the following procedure.
1. Remove the current configuration from the switches. You will need to split the configuration up for
each switch.
2. Copy the files to the flash memory of the appropriate switch.
3. Copy the files on the flash drive to the startup-config.
4. Reset the stacking ports to user ports for both switches.
5. Reload the stack and confirm the new configurations have been applied.
6. On the Secondary switch (stack-unit1), enter the command stack-unit1 renumber 0.
7. Confirm the reload query.
8. After reloading, confirm that VLT is enabled.
9. Confirm that the management ports are interconnected or connected to a switch that can transfer
Heartbeat information.
980
Virtual Link Trunking (VLT)