It not depends, I got this message if ipv6 is switched off or on. Only 
in SL6.4!

On 04-Jul-13 16:00, Sandy Philpott wrote:
> Have you recently turned on IPv6?  We stumbled across the same error and after investigating, found this info...
>
>  From the QLogic Fabric Manager user manual:
>
>      "Most IB switches have a limitation of 1024 multicast LIDs (MLIDs). However IPv6 (and possibly other applications) can create numerous multicast groups. In the case of IPv6, there is one Solicited-Node multicast group per Channel Adapter port. This results in an excessively large number of multicast groups.
>
>
> Furthermore, while OpenSM simply maxes out available MLIDs, the QLogic Fabric Manager will allow the first 500 groups to be distinct, after which it will start sharing groups in order to prevent multicast join failures:
>
>      "By default the SM will share a pool of 500 LIDs among all IPv6 solicited-node multicast groups. Thus in fabrics of 500 nodes or less, a unique LID will be used for every multicast group. However in larger fabrics, LIDs will be shared so that there are still over 500 unique LIDs available for other multicast groups, such as the IPoIB broadcast group and other multicast groups which may be used by applications.
>
> ----- Original Message -----
> From: "Semi" <[log in to unmask]>
> To: "[log in to unmask]" <[log in to unmask]>
> Sent: Thursday, July 4, 2013 5:10:26 AM
> Subject: Infiniband errors on SL6.4
>
> This error I got only on SL6.4. (6.1-6-3 OK). Any idea?
> ib0: multicast join failed for ff12:401b:ffff:0000:0000:0000:ffff:ffff,
> status -22