Juniper QFabric QFX3000-G Hardware Documentation page 909

Troubleshooting QFX3100 Director Device Isolation
Problem
Resolution
Copyright © 2018, Juniper Networks, Inc.
Description: Both connections between the QFX3100 Director devices are broken so that
one of the Director devices in a Director group becomes isolated from the group.
The redundant patch cables interconnecting the Director devices are critical links required
for the operation of the Director group. The two inter-Director device links must remain
connected when the Director devices are online. After the Director devices are installed
and the Director group is active, if a single inter-Director device link loses and regains its
connection, the operation of the Director group remains intact. However, the loss of both
inter-Director device links causes one Director device to isolate itself from the Director
group.
WARNING: Do not reconnect the inter-Director patch cables before properly
restarting the isolated Director device. Restarting the active Director device
instead of the isolated Director device can result in both Director devices
rebooting, with a subsequent data loss.
Environment: This problem occurs between the two QFX3100 Director devices found in
QFabric systems.
Symptoms: Symptoms of this problem include an unscheduled rebooting of one of the
Director devices.
Determine Which Director Device Is Isolated
Before restoring the inter-Director device links, determine which one of the Director
devices is in isolation.
To locate an isolated Director device, use one of the following methods:
Review logs or management tools for standard SNMP traps issued from the Director
group before the Director device became isolated.
If eth-2/6 links are down, the Director group cannot communicate. Normally, one of
the devices reboots.
If both eth-2/6 and eth-7/8/9 links are down, the Director device is isolated from
the control plane and is not providing fabric services.
Issue
show fabric session-host
Use the CLI to determine the serial numbers of the active Director device.
Issue the
show fabric session-host
root@qfabric>show fabric session-host
Identifier: 0281042010000013
Chapter 57: Restoring QFX3100 Volumes
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command.
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