Reference Guide

Table Of Contents
Boot the Chassis with a Single RPM
You can boot the chassis with one RPM and later add a second RPM, which automatically becomes the standby RPM.
FTOS displays the following message when the standby RPM is online.
%RPM-2-MSG:CP0 %POLLMGR-2-ALT_RPM_STATE: Alternate RPM is present
%IRC-6-IRC_COMMUP: Link to peer RPM is up
%RAM-6-RAM_TASK: RPM1 is in Standby State.
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 must
be running the same version of FTOS.
To configure either RPM to be the primary after the next chassis reboot, use the redundancy primary command
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 the following table. To view the configuration loaded on each RPM, use the
show redundancy command, as shown in the example in Automatic and Manual RPM Failover.
Table 28. Mismatch Condition Behaviors
Mismatch Condition Example Behavior
Different FTOS versions with only the
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 the following
message.
Different FTOS versions with the 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 the second message
and a boot fail prompt.
Different FTOS versions with only the
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 the following message.
Example of 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.
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