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Overview:
Feature 1404 "Graceful Upgrade IMG software in SS7 Network" adds to the IMG the ability to easily upgrade the IMG System Software in a Network that consists of an SS7 Primary Node, SS7 Secondary Node, and SS7 Remote Nodes. Previously, upgrading system software would require bringing all the nodes down at once, upgrading software, reconfiguration, and then start processing calls again. Feature 1404 adds the ability to upgrade the software in each individual IMG in a step by step process which will limit the number of calls lost during this process. Feature 1404 supports upgrading the IMG for up to two CI (Controlled Introduction) releases back. For example, anyone running software 10.5.0 or 10.5.1 can take advantage of this feature when upgrading to 10.5.2 software. The procedure below explains the steps required to accomplish the upgrade with a minimal amount of downtime.
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Important Note: If upgrading from 10.5.0 the graceful upgrade procedure requires both servers to be reset at the same time. For more information, see the heading 'Step 4 - SS7 Primary/Secondary Node Software Upgrade' steps 6 and 7 below. |
Related Topics:
IMG 1010 - Graceful Upgrade Manager
SS7 Network Diagram:
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Procedure:
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In ClientView go to File > Save Configuration File. This will save the latest configuration file that will be used to re-configure the IMG. Once saved shut down the ClientView application by selecting File > Exit.
Shut down GCEMS application by double clicking on the desktop icon StopGCEMS.
Once these two applications have been closed then the newest versions of these applications can be loaded. Go to ftpBuilds folder and install the latest versions of IMG and IMGUserInterface which were just transferred. For information on installing these two files refer to IMG 1010 - Installing GCEMS Software
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IMPORTANT NOTE!!! - When loading the newest version of IMG software (IMG_10.5.x.xxx.bin) the installation script will ask the following: !!! Select 2 - No as shown in the screen capture above. By doing this, GCEMS will not create a config_backup_<Timestamp> file. See screen capture above. |
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If loading the System Software to the IMG 1010 using just the SD Card, the time it takes to load the file into the IMG is much longer than if loading through an FTP Server. The additional time for loading can cause an error messages like the following to occur: SS7 Server(s) never came up. Click Cancel to investigate in Main Window. To avoid seeing these error messages during the upgrade process, the NODE_RESET_WAIT_TIMER environment variable needs to either be added or modified. Follow the steps below to modify.
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If loading the system software file using FTP functionality on the GCEMS server, modify the links located in the /home/excelsw/ftpBuilds folder so that FTP will load the newest software once the upgrade process is started. This can be done using lnimg (link img) script or manually using the ln -sf command. For information on changing the links refer to IMG 1010 - Configure GCEMS and Start Linux Services
If, however, the System Software File is being loaded using the SD Card, the bootup.cfg file on the SD Card must be modified. Refer to IMG 1010 - Downloading System Software from SD Card
Once the links have been updated, the GCEMS and ClientView applications can be restarted. Follow instructions below.
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Right Click on the Logical IMG object and select New Graceful Upgrade Manager.
The Graceful Upgrade Manager will get created with information about the current SS7 Network. For more information on this pane, see IMG 1010 - Graceful Upgrade Manager
Disable any backup nodes that would be part of an N+1 Setup.
Optional:
Before starting the upgrade process, note that there is an optional step that can be performed that will allow you to gracefully take the standby Out of Service ensuring there are no more calls being processed before proceeding. To accomplish this, Right Click on the node in the Graceful Upgrade Manager table and select Graceful Out Of Service.” See IMG 1010 - Graceful Shutdown of IMG for more information on the Feature.To begin the upgrade process the "Upgrade SS7 Nodes" button will need to be pressed. This will bring up a dialog box that will allow you to reset the SS7 Standby Node.
Once you are ready to start the procedure, click the "Upgrade SS7 Nodes" Button in the Graceful Upgrade Manager Pane. The following dialog box will appear. Read the dialog and verify you have accomplished everything in the dialog box.
Once satisfied everything in dialog box list has been accomplished, hit the "Reset Standby" button.
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In the Object Table under the Graceful Upgrade Manager pane, select a remote node. Right Click and select "Graceful Out of Service" as shown below. See Graceful Shutdown of IMG link above for more information.
Allow the node to finish processing calls and go Out Of Service.
Once Out Of Service, select the remote node from the Object Table as shown above and select "Reset Node". The node will now reset and load latest revision software loaded earlier and ClientView will re-configure remote node and start to process calls again.
Continue upgrading remote nodes until all remote nodes have been upgraded.
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Once finished upgrading the software on all nodes within the Logical Node Group, you can now upgrade the nodes outside the Logical Node Group. These nodes will not be part of the Object table and would have to be upgraded using the "Clear Software" command. See IMG 1010 - Clearing Software from IMG for information on accomplishing this.
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