Definition of the dual-controller active-active working mode

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Definition of the dual-controller active-active working mode:
FAQ-What is active-active working mode for dual controllers

Other related questions:
Dual-controller active-active mode
Dual-controller active-active mode (also called as the active-active working mode): Both controllers are simultaneously active and concurrently process I/O requests initiated by application. If one controller fails or becomes offline, the other takes over services without affecting its own services. The active-active mode ensures robust system reliability using controller redundancy. In addition, this mode provides advantages, such as balancing service load, boosting system performance, and improving resource utilization.

Work mode of active and standby MPUs on S series switches
MPU is a mandatory card for switches. Each switch must be configured with one or two MPUs. When only one MPU is configured for a switch, the MPU can be installed in either MPU slot of the switch. When two MPUs are configured, they work in hot standby mode to improve system reliability. The two MPUs monitor each other. If the active MPU fails, the standby MPU changes to active state to ensure non-stop services.

What is operating mechanism of the U1900s working in active/standby mode?
1. When the active node fails, the standby node is disconnected from the active node and takes over all voice services from the active node. 2. The active and standby nodes both connect to the PSTN. When the active node fails, the standby node routes calls to the PSTN through trunks. 3. When the active node recovers, all services are switched back from the standby node to the active node. For details, see Configuration > Configuration Examples in Typical Scenarios > Configuring the Unified Gateway Two-Node Cluster > Background in the eSpace U1900 Series Unified Gateway Product Documentation.

Does an AR support dual uplinks in active and standby mode
An AR with dual WAN interfaces configured can support two uplink interfaces in active and standby mode. 1. Configure two static routes with different priorities. Generally, the data flow is sent out through the active link with a high priority. It is sent out through the backup link with a low priority only after a fault occurs on the active link. 2. Configure policy-based routing. Generally, the data flow is sent out through the active link through on policy-based routing. It is sent out through the standby link based on the default route in the routing table after a fault occurs on the active link.

How to load licenses for U1980s working in active/standby mode
Two licenses are required, one for the active U1980 and the other for the standby one. The active U1980 needs a normal license, and the standby U1980 only needs a two-node cluster license. Methods of loading a license: 1. If the U1980 version is V100R001C20 or V200R003, you can load a license using the web management system. A. Log in to the web management system. B. Choose System > License Information > License Management from the navigation tree. C. Click Browse and select the license file. D. Click Upload. 2. You can also use the LMT to load a license. A. Choose Load Installation > Load B. Click View License and check the license information. C. Click Browse and select the path for storing the license file D. Click Load. NOTE: Before loading a license file, change the file name to license.dat.

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