Users Guide

Description Behavior at Peer Up Behavior During Run Time Action to Take
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.
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; 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
software 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-unit 2), enter the command stack-unit 2 renumber 1.
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.
Virtual Link Trunking (VLT) 893