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It is assumed that you have standard procedures for system maintenance and that the person performing the software upgrade is qualified to perform this procedure. The following should be considered while planning a maintenance window:

  • network activities that are taking place during the software upgrade

  • soak time before beginning a new network change

  • service usage irregularities such as phone-in contests

  • availability of operations staff

  • availability of vendor’s support staff

  • availability of support staff in network operations centers (NOCs) that are connected to your system

  • seasonal issues such as Christmas brown-out periods of network changes

  • NOC expert staff vacation schedules

  • system configuration (mated pair Sonus DSC Platformsystems, see Upgrading Sonus DSC 8000 in a Mated Pair Configuration)

Customer Support provides emergency support to customers who have a support agreement. However, it is recommended that you notify this group about one week prior to planning a maintenance window for a software upgrade. For more information, see  Customer Support.

It is recommended that the NOC tests its maintenance window procedures prior to the software upgrade. This process allows the NOC staff to test the maintenance window procedures and isolate any existing problems prior to the software upgrade. To perform this test in its entirety, notifications may have to be sent to the locations that are affected by the maintenance window.

It is highly recommended that you run a pre-upgrade check while planning the maintenance window to identify and resolve any possible issues that could hinder the software upgrade.

If you have off-site systems for spare hardware purposes, you should consider upgrading these systems as disaster recovery, lab, and training sites. If such a system is available, the training for software upgrade and rollback should take place on this system. Make sure to note the required time for each process.

Example Procedure

The following is an example of a software upgrade document:

Sonus DSC Platform Software Upgrade

CLLI: wesott234top

Maintenance Window Times:

  • Start: 31 October 2016 23:00 EST
  • Late Stop: 1 November 2016 03:00 EST
  • Expected Stop: 1 November 2016 00:30 EST

Note

Expected stop refers to the time when a software upgrade that is executed without any problems should be completed. Late stop refers to the time when an aborted upgrade with software rollback to the previous software version is completed.

The following table provides an example schedule for a software upgrade.

Table : Example Schedule for a Software Upgrade

 
Item Expected Completion
Approval of the maintenance window for software upgrade plan November 15
Notification to connected NOCs1 November 23
Notification to various departments affected by this event (Billing, Marketing, and so on) November 23
Dry-runs in lab Week of November 23
Pre-upgrade Check (on a live system) The pre-upgrade check should be executed several times a few days before the upgrade and immediately before the upgrade.
Backup system November 30, 22:00
Review system status November 30, 22:15
Call NOCs and connected networks2 November 30, 23:45
Perform software upgrade according to Sonus instructions 00:00
Bring up SS7 links on standby Sonus DSC 8000 in the mated pair configuration 00:15
Call NOCs and connected networks 00:30
Review system status and test service 01:00
Backup systems  

1 Providing the NOCs and connected networks one week in advance to the software upgrade gives them an opportunity to advise you of any activities they may have that could hinder the software upgrade.

2 It is recommended that you contact the NOCs and connected networks prior to bringing down the SS7 links. Performing this task generates alarms.

Upgrading Sonus DSC 8000 in a Mated Pair Configuration (PCE is Licensed on the Systems)

If you have a system configuration that comprises a mated pair of DSC Platform which are licensed for PCE, these systems must be upgraded during the same maintenance window.

One of the DSC Platform in the mated pair configuration supports PCE Peer 1 and Peer 2, and the other DSC Platform supports PCE Peer 3 and Peer 4. The DSC Platform that supports PCE Peer 1 and 2 must be upgraded first.

To identify PCE peers

  1. SSH to the DSC Platform.

    ssh root@<ip address of the DSC 8000>

      

  2. Log onto the system.

    User ID: <root>
    password: <root password>

       

  3. Enter the following command at the prompt:

    cat /etc/hosts

      
    The PCE peers and their respective IPs are listed at the end of this file.

     
    Example:

    10.91.2.86  pce1_1

    10.91.4.86  pce1_2

    10.91.2.87  pce2_1

    10.91.4.86  pce2_2

    10.91.2.90  pce3_1

    10.91.4.90  pce3_2

    10.91.2.91  pce4_1

    10.91.4.91  pce4_2

    pce1_1 and pce1_2 are IPs for PCE peer1

    pce2_1 and pce2_2 are IPs for PCE peer2

    pce3_1 and pce3_2 are IPs for PCE peer3

    pce4_1 and pce4_2 are IPs for PCE peer4