Administrator Guide
Description Behavior at Peer Up Behavior During Run Time Action to Take
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 congured on
one VLT peer
A syslog error message is
generated. The peer with the
VLT congured remains active.
A syslog error message is
generated. The peer with the
VLT congured remains active.
Verify the VLT LAG ID is
congured 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.
Reconguring Stacked Switches as VLT
To convert switches that have been stacked to VLT peers, use the following procedure.
1 Remove the current conguration from the switches. You will need to split the conguration up for each switch.
2 Copy the les to the ash memory of the appropriate switch.
3 Copy the les on the ash drive to the startup-cong.
4 Reset the stacking ports to user ports for both switches.
5 Reload the stack and conrm the new congurations have been applied.
6 On the Secondary switch (stack-unit1), enter the command stack-unit1 renumber 0.
7 Conrm the reload query.
8 After reloading, conrm that VLT is enabled.
9 Conrm that the management ports are interconnected or connected to a switch that can transfer Heartbeat information.
Specifying VLT Nodes in a PVLAN
You can congure VLT peer nodes in a private VLAN (PVLAN). VLT enables redundancy without the implementation of Spanning Tree
Protocol (STP), and provides a loop-free network with optimal bandwidth utilization.
Because the VLT LAG interfaces are terminated on two dierent nodes, PVLAN conguration of VLT VLANs and VLT LAGs are
symmetrical and identical on both the VLT peers. PVLANs provide Layer 2 isolation between ports within the same VLAN. A PVLAN
partitions a traditional VLAN into sub-domains identied by a primary and secondary VLAN pair. With VLT being a Layer 2 redundancy
mechanism, support for conguration of VLT nodes in a PVLAN enables Layer 2 security functionalities. To achieve maximum VLT resiliency,
you should congure the PVLAN IDs and mappings to be identical on both the VLT peer nodes.
1078
Virtual Link Trunking (VLT)