Deployment 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
software versions on the VLT
peers is compatible. For more
information, refer to the Release
Notes for this release.
VLT LAG ID is not congured on
one VLT peer
A syslog error message is
generated. The peer with the
VLT congured remains active.
A syslog error message is
generated. The peer with the
VLT congured remains active.
Verify the VLT LAG ID is
congured 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
conguration 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 dierent nodes, PVLAN conguration 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 identied by a primary and secondary VLAN pair. With VLT being a Layer 2 redundancy
mechanism, support for conguration of VLT nodes in a PVLAN enables Layer 2 security functionalities. To achieve maximum VLT resiliency,
you should congure the PVLAN IDs and mappings to be identical on both the VLT peer nodes.
The association of PVLAN with the VLT LAG must also be identical. After the VLT LAG is congured to be a member of either the primary
or secondary PVLAN (which is associated with the primary), ICL becomes an automatic member of that PVLAN on both switches. This
association helps the PVLAN data ow received on one VLT peer for a VLT LAG to be transmitted on that VLT LAG from the peer.
You can associate either a VLT VLAN or a VLT LAG to a PVLAN. First congure the VLT interconnect (VLTi) or a VLT LAG by using the
peer-link port-channel id-number command or the VLT VLAN by using the peer-link port-channel id-number
peer-down-vlan vlan interface number command and the switchport command. After you specify the VLTi link and VLT
LAGs, you can associate the same port channel or LAG bundle that is a part of a VLT to a PVLAN by using the interface interface
and switchport mode private-vlan commands.
When a VLTi port in trunk mode is a member of symmetric VLT PVLANs, the PVLAN packets are forwarded only if the PVLAN settings of
both the VLT nodes are identical. You can congure the VLTi in trunk mode to be a member of non-VLT PVLANs if the VLTi is congured
on both the peers. MAC address synchronization is performed for VLT PVLANs across peers in a VLT domain.
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Virtual Link Trunking (VLT)