Users Guide

Description Behavior at Peer Up Behavior During Run
Time
Action to Take
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.
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 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.
Virtual Link Trunking (VLT) 1203