1. Network topology & system architecture

2. Key features and business

3. The amount of business involved

3. Introduction to the purpose of change

2. Introduction to the scope of change

3. Introduction to change time

4. Introduction to the change process

5. Introduction to the impact of changes

6. Risk analysis of change failure and rollback

1. Change person in charge

2. Change implementer

3. Change verification personnel

4. Business verification personnel

5. Support and security personnel

1. Enterprise WeChat

2. Sunflower

1. Change the designed software tools

2. Mobile phones, walkie-talkies and other communication equipment

3. Designed hardware tools

4. Preparation of spare parts and emergency supplies

1. View system alarm information

2. Check the system operating status

1. Back up configuration files

2. Plan the topology diagram before and after the change

3. Coordinate verification personnel and processes before and after changes

4. Prepare change tools

1. If the change is completed normally, go to 5 for change verification.

2. If an exception occurs after the change, go to 4 to rewind.