Troubleshooting Vlt - Dell Force10 S4810P Configuration Manual

Troubleshooting VLT

Use the following information to help troubleshoot different VLT issues that may occur.
Note: For information on VLT failure mode timing and its impact, contact your Dell Force10
representative.
Description
Bandwidth monitoring
Domain ID mismatch
FTOS Version mismatch A syslog error message is
Remote VLT port
channel status
Spanning tree mismatch
at global level
Spanning tree mismatch
at port level
System MAC mismatch
1094
| Virtual Link Trunking (VLT)
Behavior at Peer Up
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%.
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.
generated.
N/A
All VLT port channels go
down on both VLT peers.
A syslog error message is
generated.
A syslog error message is
generated.
A syslog error message
and an SNMP trap are
generated.
The VLT domain will not
be formed. The VLTi will
be in a down state.
Behavior During Run
Time
A syslog error message
and an SNMP trap is
generated when the VLTi
bandwidth usage goes
above its threshold.
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.
A syslog error message is
generated.
N/A
No traffic is passed on the
port channels.
A one-time informational
syslog message is
generated.
A one-time informational
syslog message is
generated.
A syslog error message
and an SNMP trap are
generated.
Action to Take
Depending on the traffic
that is received, the traffic
can be offloaded inVLTi.
Verify that the domain ID
matches on both VLT
peers.
Follow correct upgrade
procedure for unit with
mismatched FTOS
version.
Use the show vlt detail and
show vlt brief commands
to view VLT port channel
status information.
During run time, a loop
may occur as long as the
mismatch lasts.
To resolve, enable RSTP
on both VLT peers.
Correct the spanning tree
configuration on the ports.
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.