Troubleshooting Vlt - Dell S6100 Configuration Manual

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 108. Troubleshooting VLT
Description
Bandwidth monitoring
Domain ID mismatch
Dell Networking OS Version
mismatch
Remote VLT port channel status N/A
Spanning tree mismatch at
global level
Spanning tree mismatch at port
level
System MAC mismatch
Unit ID mismatch
Version ID mismatch
966 Virtual Link Trunking (VLT)
Behavior at Peer Up
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%.
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.
A syslog error message is
generated.
All VLT port channels go down
on both VLT peers. A syslog
error message is generated.
A syslog error message is
generated.
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 is
generated.
A syslog error message and an
SNMP trap are generated.
Behavior During Run Time
A syslog error message and an
SNMP trap is generated when
the VLTi bandwidth usage goes
above its threshold.
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.
A syslog error message is
generated.
N/A
No traffic is passed on the port
channels.
A one-time informational syslog
message is generated.
A one-time informational syslog
message is generated.
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 is
generated.
A syslog error message and an
SNMP trap are generated.
Action to Take
Depending on the traffic that is
received, the traffic can be
offloaded inVLTi.
Verify the domain ID matches on
both VLT peers.
Follow the correct upgrade
procedure for the unit with the
mismatched Dell Networking OS
version.
Use the show vlt detail
and show vlt brief
commands to view the VLT port
channel status information.
During run time, a loop may
occur as long as the mismatch
lasts.
To resolve, enable RSTP on both
VLT peers.
Correct the spanning tree
configuration on the ports.
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.
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'.
Verify the Dell Networking OS
software versions on the VLT
peers is compatible. For more