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JUNOSe 11.1.x Service Availability Configuration Guide
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 slot. The SRP modules record their
latest roles and retain them the next time you switch on the router.
With the default software settings, if the primary SRP module fails, the redundant
SRP module assumes control without rebooting itself. For information about
preventing the redundant SRP module from assuming control, see "Managing SRP
Module Redundancy" on page 16.
On E120 and E320 routers, the switch fabric is distributed between the SFMs and
the SRP modules. If the primary SRP module fails a diagnostic test on its resident
slice of switch fabric, then it abdicates control to the redundant SRP module if both
of the following are true:
When the redundant SRP module assumes control, the following sequence of events
occurs:
1.
2.
3.
The following actions activate the redundant SRP module:
12
Line Module Redundancy Overview
The standby SRP module does not indicate any error.
The standby SRP module passes diagnostics on its attached fabric slice.
The original primary SRP module reboots and assumes the redundant role.
The redundant SRP module restarts and assumes the primary role without
reloading new code. (When upgrading software, you must reload the software
on the redundant SRP module. See Installing JUNOSe Software in the JUNOSe
System Basics Configuration Guide.)
All line modules reboot.
Failure of the primary SRP module (hardware or software)
Pushing the recessed reset button on the primary SRP module (See Figure 1 on
page 13 and Figure 2 on page 14.)
Issuing the srp switch command
Issuing the redundancy force-switchover command
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