Troubleshooting - Extreme Networks BlackDiamond 6800 User Manual

Performing a Hitless Upgrade
6 Initiate failover using the following command:
run msm-failover
The failover allows MSM-B to become the master running the new software release. Because the
current image selected is primary, MSM-A reboots to the old release. MSM-B then downloads the
original configuration from MSM-A back to MSM-A.
NOTE
If you issue any configuration command (configuration, enable, disable, create, etc.) after a conservative
upgrade, you are unable to downgrade to the previous software release.
By using the conservative method, you can upgrade or downgrade software without disrupting the
network. This method allows you to test new software releases because you:
• Will not disrupt the network
• Can failback to your previous software version and configurations saved to MSM-A
If you want to failback to MSM-A after you test a software release, enter the
command. MSM-A becomes the master and runs the software and configurations you had in place
before the upgrade.
After you qualify the new software release and determine that you do not want to failback to the
previous software release, enter the
switch, both MSM-3s run the new software image.

Troubleshooting

If you encounter problems during a hitless upgrade, this section may be helpful. If you have a problem
not listed here or in the release notes, contact your Extreme Networks Technical Support representative.
MSM-3 Initialization
If the slave MSM-3 does not initialize properly, you can restart the MSM hardware, including the switch
fabric, using the following command:
reboot slot [msm-a | msm-b] hard-reset
where the following is true:
• —Specifies the slave MSM-3 module installed in slot A.
msm-a
• —Specifies the slave MSM-3 module installed in slot B.
msm-b
• —Restarts the MSM hardware, processor, and switch fabric. If you select this option, you
hard-reset
will experience some traffic loss.
NOTE
If you enter the
hard-reset
After you enter the
hard-reset
switch forwarding operations may be briefly interrupted, and you are asked to confirm the operation. If
you do not want to interrupt switch forwarding, do not confirm the operation.
14
use image secondary
option, a hitless upgrade does not occur.
option, a warning message is displayed that indicates some of the
run msm-failover
command. The next time you reboot the
Hitless Failover and Hitless Upgrade User Guide