Reference Guide

984 | Virtual Link Trunking (VLT)
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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.
Spanning tree mismatch
at port level
A syslog error message is
generated.
A one-time informational
syslog message is
generated.
Correct the spanning tree
configuration on the ports.
System MAC mismatch A syslog error message
and an SNMP trap are
generated.
A syslog error message
and an SNMP trap are
generated.
Verify that the unit ID of
VLT peers is not the same
on both units and 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;
i.e., 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 software versions on
the VLT peers is
compatible. For more
information, see 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.
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.
Description Behavior at Peer Up
Behavior During Run
Time Action to Take