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Boot the chassis with dual RPMs
When you boot the system with two RPMs installed, the RPM in slot R0 is the primary RPM by default.
Both RPMs should be running the same version of FTOS. You can configure either RPM to be the primary
upon the next chassis reboot using the command
redundancy primary from CONFIGURATION mode.
Version compatibility between RPMs
In general, the two RPMs should have the same FTOS version. However, FTOS tolerates some degree of
difference between the two versions, as described in Table 18-1. View the configuration loaded on each
RPM using the
show redundancy command as shown in Figure 18-1.
Table 18-1. System Behavior with RPMs with Mismatched FTOS Versions
Mismatch Condition Example Behavior
different FTOS versions with
only first two digits matching
Primary: 7.4.2.0
Standby: 7.4.1.0
The link to the standby RPM is up, and FTOS block syncs only the
startup-config. The failover type is warm upgrade. FTOS displays
Message 2.
different FTOS versions with
first two digits not matching
Primary: 7.6.1.0
Standby: 7.5.1.0
The link to the standby RPM is down, and the standby RPM is in a boot
loop. FTOS displays Message 3 and a boot fail prompt.
different FTOS versions with
only first three digits matching
Primary: 7.4.2.0
Standby: 7.4.2.1
The link to the peer RPM is up, and FTOS performs a complete block
sync. The failover type is hot failover. FTOS displays Message 2.
Message 2 FTOS Version Incompatibility Error
************************************************
*
* Warning !!! Warning !!! Warning !!!
*
* ----------------------------------------------
*
* Incompatible SW Version detected !!
*
* This RPM -> 7.4.2.0
* Peer RPM -> 7.4.1.0
*
************************************************
00:00:12: %RPM0-U:CP %IRC-4-IRC_VERSION: Current RPM 7.4.2.0 Peer RPM 7.4.1.0 - Different
software version detected
00:00:12: %RPM0-U:CP %IRC-6-IRC_COMMUP: Link to peer RPM is up
00:00:14: %RPM0-U:CP %RAM-6-ELECTION_ROLE: RPM0 is transitioning to Primary RPM.
Message 3 Boot Failure on Standby RPM
System failed to boot up. Please reboot the chassis !!!
00:12:46: %RPM1-U:CP %TME-0-RPM BRINGUP FAIL: FTOS failed to bring up the system
Communication between RPMs is not up, check the software version and reboot chassis.
FTOS(standby)(bootfail)#