Administrator Guide

Congure the port channel to an attached device.
Verify that the port channels used in the VLT domain are assigned to the same VLAN.
Verifying a Port-Channel Connection to a VLT Domain (From an Attached Access Switch)
On an access device, verify the port-channel connection to a VLT domain.
Troubleshooting VLT
To help troubleshoot dierent 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 22. Troubleshooting VLT
Description Behavior at Peer Up Behavior During Run Time Action to Take
Bandwidth monitoring 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%.
A syslog error message and an
SNMP trap is generated when
the VLTi bandwidth usage goes
above its threshold.
Depending on the trac that is
received, the trac can be
ooaded inVLTi.
Domain ID mismatch
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.
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.
Verify the domain ID matches
on both VLT peers.
Dell Networking OS Version
mismatch
A syslog error message is
generated.
A syslog error message is
generated.
Follow the correct upgrade
procedure for the unit with the
mismatched Dell Networking
OS version.
Remote VLT port channel
status
N/A N/A Use the show vlt detail
and show vlt brief
commands to view the VLT
port channel status
information.
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
PMUX Mode of the IO Aggregator
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