R21xx-HP FlexFabric 11900 IRF Configuration Guide

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IRF link redundancy
• For link redundancy and load sharing, bind up to eight physical ports to one IRF port.
• Physical ports bound to an IRF port can be located on different cards.
• HP recommends using multicard IRF links to avoid a card removal causing an IRF split.
ECMP route restrictions
To form an IRF fabric, all member devices must have the same setting for the maximum number of ECMP
routes. For more information about configuring ECMP, see Layer 3—IP Routing Configuration Guide.
MAD
• LACP MAD handles collisions in a different way than BFD MAD. To avoid conflicts, do not enable
LACP MAD with BFD MAD.
• If LACP MAD runs between two IRF fabrics, assign each fabric a unique IRF domain ID. For BFD
MAD, this task is optional.
• To exclude a port from the shutdown action that is executed when an IRF fabric transits to the
Recovery state, use the mad exclude interface command. To bring up a port after the IRF fabric
transits to the Recovery state, you must use the mad restore command to activate the entire IRF fabric,
and not the undo shutdown command.
Other configuration guidelines
• If a subordinate device uses the same next-startup configuration file name as the master device, the
file might be overwritten depending on your configuration file management settings. To continue to
use the configuration file after removing the device from the IRF fabric, back up the file before setting
up the IRF fabric.
• Strictly follow the IRF fabric setup procedure described in "Setup and configuration task list" to pla
n
the IRF fabric, identify IRF physical ports, connect IRF member devices, and configure basic settings.
• If two IRF fabrics have the same bridge MAC address, they cannot merge.
• Assign each member a unique IRF member ID to make sure they can merge. You must reboot the
members to validate the IRF member ID settings.
• Assign the highest member priority to the device you want to use as the master.
• Assign each IRF fabric a unique IRF domain ID in a multi-IRF network.
• Save any configuration you have made to the startup configuration file before you reboot the IRF
member devices.