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Dell SmartFabric Services User Guide Release 10.5.5

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Designated leader

From the SFS 10.5.4.4 release, you can configure the switches in the fabric as designated leaders. When the designated leader is configured in a fabric, only the switches that are configured as designated leaders can be elected as the leader, and SFS elects one of the designated switches to be the leader. When switches are configured as designated leaders, the preferred leader flag is automatically set for those switches.

NOTE:The provision to configure preferred leader is no longer available in the SFS UI as of the 10.5.5.0P1 release.

Designated leader behavior

  • If a switch is configured to be a designated leader and it is not the current leader, the switch immediately becomes the leader.
    NOTE:During the leader switchover, the SFS instance may be unavailable for about four minutes. Data forwarding is not affected.
  • When the current leader is designated as the leader, the leader switchover does not occur.

You can remove the designated leader configuration from the switches at any time. If the designated leader feature is not configured in the fabric or all the switches configured as designated leaders are offline, a new leader is elected from the list of fabric switches.

Backoff timer

The backoff timer is used when the designated leader switches in the fabric are offline. If the designated leader switches are offline, the fabric waits until the backoff timeout expires before electing a new leader from the nondesignated leader switches. When a designated switch comes online, the nondesignated leader relinquishes control to the designated node, allowing the designated node to become the leader.

Configuration notes

  • Dell Technologies recommends configuring the spine switches as designated leader for better performance.
  • Dell Technologies recommends configuring at least two or more designated leaders.
  • Designated leader cannot be removed on a switch that is set as preferred leader.
NOTE:If the current leader switch (also configured as the designated leader) is removed from the role and a new switch is assigned as the leader, SFS UI loses connectivity during the leader switchover. You must use the new leader's IP address to log in to the SFS UI.

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