Work mode of active and standby MPUs on S series switches

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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.

Other related questions:
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.

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.

Does the SCU board on the U1960 support the active/standby deployment mode?
The SCU boards on the U1981 and U1980 support the active/standby mode. For other U1900 models, each model supports only one SCU board and has only one slot for housing the board.

How do I configure a VRRP group in active/standby mode on an S series switch
To configure a VRRP group in active/standby mode on an S series switch (except the S1700), see section "Example for Configuring a VRRP Group in Active/Standby Mode" in "Typical Reliability Configuration" at S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples. The VRRP configuration method for the S9300 is the same as that for other switch models.

Whether the master and slave subracks work in the load sharing mode or the active/standby mode
Either a master subrack or a slave subrack is an independent subrack. There is no active/standby relationship between them. There can be protection between them based on the networking mode. For example, protection can be formed in a tree topology using two cables or in a ring topology. Protection cannot be formed, however, in a tree topology using only one cascading network cable between the master and slave subracks. The support for protection between the master and slave subracks varies according to products. For details, see the related product documentation.

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