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SRP Modules

Note: This section applies to ERX-7xx and ERX-14xx models only. ERX-310 routers contain one SRP module and therefore do not offer SRP module redundancy.

ERX-7xx and ERX-14xx models use a 1:1 redundancy scheme for the SRP module. When two SRP modules of the same type are installed in the chassis, one acts as a primary (active) and the second as a redundant (standby) module. Both SRP modules share a single SRP I/O module located in the rear of the chassis.

If the standby SRP module detects that the primary SRP module is not active (and high-availability mode is not enabled), it reboots the system and takes control. If high-availability mode has been enabled, automatic switchover occurs with near hitless failover. If you upgrade software, you must copy the software to the redundant SRP and reboot it. For information about configuring and managing SRP module redundancy, see JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules.

After you install two SRP modules, the modules negotiate for the primary role. A number of factors determine which module becomes the primary; however, preference is given to the module in the lower-numbered slot. The SRP modules record their latest roles and retain them the next time you switch on the system. For information about installing SRP modules, see Installing Modules.

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