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Unexpected File Transfer Protocol Server Behavior During Unified ISSU
host1#show ftp-server
FTP Server state: enabled, 0 open connections
Statistics since server was last started:
attempts: 3
failed hosts: 0
failed users: 0
Statistics since last system reload:
attempts: 3
failed hosts: 0
failed users: 0
host1#show issu detail
ISSU state:
idle
ISSU description: ISSU is currently idle
criteria met:
No, upgrade error(s) found
running release:
dtnguyen.rel
armed release:
dtnguyen.rel
Copyright © 2010, Juniper Networks, Inc.
You can perform the unified ISSU operation even when the FTP server is enabled on the
router. However, no file transfer process, such as uploading or downloading of files,
creating of directories, or removing of files, can be in progress to enable the unified ISSU
operation to complete successfully.
When you issue the issu initialize command, unified ISSU checks for open FTP connections
or active file transfer sessions. At this stage, existing connections are not terminated and
new connections can also be established. When you issue the issu start command, all
FTP connections, including data and control connections, are disconnected. Although
the listening port is still available at this stage, any attempt to create a new connection
and incomplete file operations on existing connections fail with an appropriate error
message from the FTP server.
The issu start command is not executed if file transfer operations are in progress. You
must issue the ftp-server flush command to forcibly terminate the file transfer process.
When you are prompted to confirm, type y to confirm to close all active file transfer jobs.
CAUTION: Because using the ftp-server flush command causes a forced and
ungraceful termination of all file transfer jobs that are in progress to start the
unified ISSU process, use it only when it is absolutely necessary. We
recommend that you wait for file transfer operations that are in progress to
complete gracefully before you perform unified ISSU, if your situation enables
you to do so.
The following example shows the output of the show ftp-server command in a scenario
where FTP server is enabled, but no open file transfer connections exist.
To display detailed information about unified ISSU status and warnings in addition to
criteria required for unified ISSU and whether the router hardware and software meet
the required criteria, issue the show issu detail command.
Chapter 5: Configuring a Unified In-Service Software Upgrade
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