Concept Guide

Congure the backup link.
Congure the VLT interconnect (VLTi).
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.
Conguring Virtual Link Trunking (VLT Peer 2)
Enable VLT and create a VLT domain with a backup-link VLT interconnect (VLTi).
Dell_VLTpeer2(conf)#vlt domain 999
Dell_VLTpeer2(conf-vlt-domain)#peer-link port-channel 100
Dell_VLTpeer2(conf-vlt-domain)#back-up destination 10.11.206.23
Dell_VLTpeer2(conf-vlt-domain)#exit
Congure the backup link.
Congure the VLT interconnect (VLTi).
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 38. 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
298 PMUX Mode of the IO Aggregator