non-symmetric MFT

non-symmetric MFT

[Michael Di Domenico]

i;ve run ibdiagnet -r on my infiniband network, i have a few errors
showing up with this

Found a non symmetric MFT on MLID:0x0CBB got to node:<guid> through
port:17 which does not point back to node, etc etc...

what does this mean?  i tried to look at the source but the comment a
few lines above is not clear english, so i'm not sure what this is
trying to tell me

my fabric is up, so i'm assuming this is a routing issue, but i'm not sure how
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Re: non-symmetric MFT

[Hal Rosenstock]

On 7/18/2013 1:50 PM, Michael Di Domenico wrote:
> i;ve run ibdiagnet -r on my infiniband network, i have a few errors
> showing up with this
> 
> Found a non symmetric MFT on MLID:0x0CBB 

Is that the real MLID or a typo ? MLIDs start at 0xC000.

> got to node:<guid> through
> port:17 which does not point back to node, etc etc...
> 
> what does this mean?

It means that for some MLID on current switch, there is a port mask bit
set to go to a neighbor switch but when looking at same MLID in MFT on
neighbor switch, there isn't a port mask bit set pointing back to this
switch.

> i tried to look at the source but the comment a
> few lines above is not clear english, so i'm not sure what this is
> trying to tell me
> 
> my fabric is up, 

Does IPoIB have full connectivity ?

> so i'm assuming this is a routing issue, 

It could be a multicast routing issue or tool issue.

-- Hal

> but i'm not sure how
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