Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1571)

AMF Introduction and Configuration
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 59.27
Node recovery
Automatic node recovery
Within an AMF network, a node that has failed can be replaced with an unconfigured
device of the same type, and AMF will automatically upgrade and configure the new
device from the most recent backup. Often the replacement device will be a factory
default, brand new “out of the box” device, but it may be that you want to replace the
failed unit with one that has been previously used elsewhere. In this instance it is
necessary to return the replacement device to a “clean” state so that AMF can recognize it
as a suitable replacement, and begin automatic recovery. (See section “A “Clean” node” on
page 28)
When a failed node is replaced with an unconfigured device, AMF immediately disables
forwarding on the device, shuts down all non-AMF ports, and applies the AMF safe
configuration. (See section “AMF safe configuration” on page 31.) AMF then checks
whether any of the AMF master nodes has a valid backup for the replacement node, and if
it finds one it begins to attempt automatic node recovery. Once automatic node recovery
has completed, it will then reboot the replacement node which will then rejoin the AMF
network with identical files and configuration, to the failed node it replaced.
Here is some example console output showing automatic node recovery.
Note This feature is not intended to support the simultaneous recovery of multiple
nodes.
Caution No changes should be made to the device's configuration while a node
recovery is underway. A log message will appear on the console or other
logged in session indicating when recovery has finished (whether successfully
or with errors). This message can also be found by viewing the log with the
show log .
23:03:15 awplus ATMF[863]: ATMF network detected
23:03:15 awplus ATMF[863]: ATMF safe config applied (forwarding disabled)
23:03:25 awplus ATMF[863]: Shutting down all non ATMF ports
23:03:26 x510_1 ATMF[863]: Automatic node recovery started
23:03:26 x510_1 ATMF[863]: Attempting to recover as x510_1
23:03:26 x510_1 ATMF[863]: Checking master node availability
23:03:32 x510_1 ATMF[863]: Master has joined. 2 members in total.
23:03:32 x510_1 ATMF[863]: x908_VCS_2 has joined. 3 members in total.
23:03:32 x510_1 ATMF[863]: x908_VCS_1 has joined. 4 members in total.
23:03:37 x510_1 ATMFFSR[2950]: Retrieving recovery data from master node Master
23:05:18 x510_1 ATMFFSR[2950]: File recovery from master node succeeded. Node will
now reboot
Flushing file system buffers...
Unmounting any remaining filesystems...
Restarting system.