Storage Area Networks (SAN) (Enterprise)
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Time BB credit zero

Valued Contributor Valued Contributor

Time BB credit zero

I have problem, that we installed SilkWorm 4/32 and 4/16 switches but on the ISL ports counter tim_txcrd_z is increasing.
stat_wtx 77768328 4-byte words transmitted
stat_wrx 78651020 4-byte words received
tim_txcrd_z 6368 Time BB credit zero

We checked cables but we didn't found any problem after measurement.
What should be problem?
Thank you for answer
Honored Contributor Honored Contributor

Re: Time BB credit zero


In my view 6368 tim_txcrd_z is still tolerable compared to what traffic you have on ISL. None the less, in order to resolve the issue, i don't think cable would have caused this. Probably you wanna look into the ports which are generating the traffic, try to see if any port settings are differing from others or anything significantly changed for any specific port.
Valued Contributor Valued Contributor

Re: Time BB credit zero

i checked all ports settings across fabric.
I found on the other switch not exact same ISL buffer settings

switch12# portbuffershow
User Port Lx Max/Resv Buffer Needed Link Remaining
Port Type Mode Buffers Usage Buffers Distance Buffers
---- ---- ---- ------- ------ ------- --------- ----------
0 E - 8 17 17 <2km

from the 2nd side of ISL I see output like

2 E - 8 26 26 2km

How could I setup manually buffer credits per ISL port? We don't have Extended fabric license.
Valued Contributor Valued Contributor

Re: Time BB credit zero

setted portcfglongdistance 0 LE to enable more buffer credits, also path distance is increased