Infiniband Multicast join not working anymore with Melanox cards

Solution Verified - Updated -

Issue

  • After updating the Infiniband machines to RHEL6.4 IB multicast join is not working any longer
  • After Upgrading some machines to MRG-R 2.3 IB multicast join is not working any more. After downgrading to MRG-R 2.2 or after upgrading the remaining machines to MRG-R 2.3 everything works again.
  • ibping was always working, but the MC join did not work anymore.
  • IPoIB is not affected by this.

Environment

  • Red Hat Enterprise Linux (RHEL) 6.4
  • Red Hat Enterprise MRG Realtime (MRG-R) 2.3 with kernel-rt-3.6.11-rt28.20.el6rt.x86_64 or newer
  • Melanox Cards using the mlx4_ib driver

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