Administrator Guide

Description Behavior at Peer Up Behavior During Run
Time
Action to Take
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 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.
VLT LAG VLAN mismatch A syslog error message is
generated.
A syslog error message is
generated.
Verify that the VLAN
configuration is same for
the VLT lags on both
peers.
Specifying VLT Nodes in a 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 different nodes, PVLAN configuration of VLT VLANs
and VLT LAGs are symmetrical and identical on both the VLT peers. PVLANs provide Layer 2 isolation between
Virtual Link Trunking (VLT) 989