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10 Using MLAG in Dell Networking N-Series Switches | version 1.5
2.3 MLAG and Firmware Upgrades
When upgrading the firmware for switches in an MLAG configuration, refer to the switch’s User’s Guide found
at support.dell.com
.
An upgrade with minimal disruption involves shutting off the MLAG port channels and reloading each peer
one at a time. Choose ONE peer should be chosen for the first reload. Complete the following items before
reloading.
• Disable Dual Control Plane Detection Protocol (DCPDP), if used.
• Shut down physical ports going to partner switches.
• Shut down The MLAG peer link on the peer in question.
• DO NOT save the configuration.
Caution: Do not save the configuration when performing the procedure above.
Now the other MLAG peer is handling all MLAG traffic and the administrator can initiate the reload. Because
the administrator did not save the configuration, the MLAG peer links and partners’ links are enabled when
the peer comes back online. The administrator can now repeat these steps on the other MLAG peer member.
2.4 Implementing iSCSI with MLAG
Most iSCSI devices should work fine when connected to partner switches. Problems may occur when
connecting directly into MLAG domain peer switches. Consult the User Guides for your particular iSCSI
devices to determine if network design requires that they connect directly into the MLAG domain peer
switches. In some cases, this design may be unsupported.