Users Guide

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 Dell Networking OS.
To congure 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 Dell Networking OS version. However, Dell Networking OS tolerates some degree of
dierence between the two versions, as described in the following table. To view the conguration loaded on each RPM, use the
show redundancy command, as shown in the example in Automatic and Manual RPM Failover.
Table 34. Mismatch Condition Behaviors
Mismatch Condition Example Behavior
Dierent Dell Networking OS versions
with only the rst two digits matching.
Primary: 7.4.2.0
Standby: 7.4.1.0
The link to the standby RPM is up and Dell
Networking OS block syncs only the
startup-cong. The failover type is warm
upgrade. Dell Networking OS displays the
following message.
Dierent Dell Networking OS versions
with the rst 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. Dell
Networking OS displays the second
message and a boot fail prompt.
Dierent Dell Networking OS versions
with only the rst three digits matching.
Primary: 7.4.2.0
Standby: 7.4.2.1
The link to the peer RPM is up and Dell
Networking OS performs a complete block
sync. The failover type is hot failover. Dell
Networking OS displays the following
message.
Example of Dell Networking OS 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.
Example of 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.
Dell(standby)(bootfail)#
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High Availability (HA)