Running an ISL at 8Gb produces lots of errors, 4Gb is error free. Don't understand why.

is there such a thing as buffer credits on Brocade ?

RRR,

ISL ports set to LD ?

portCfgLongDistance

Yes dynamox:>)

Henry

Still no effect.The errors only dissapear when changing to normal mode (giving me 8 b2b credits) and 4Gb fixed. absolutely no errors then. when changing to 8Gb, change to LD mode (giving me 46 b2b credits) or not and even change portcfgfillword to 3, does not resolve anything. only way of error free ISL is 4Gb Normal mode. I am the colleague of RRR

and it's consistent behavior on both fabrics ?

Just curious, what are the errors from porterrshow?  Are they by chance class 3 discards (disc c3)?  There is a Primus that may be related:

emc278061: "Brocade B-Series: 8Gb switches in Fabric OS 6.x ISL connected to Access gateway shows errors in class 3 discards disc c3 counter"

Also, just want to make sure that you are compliant to the support matrix regarding ISL's and are running at least v6.1.2b.

Also a good general read may be the "Extended Distance Technologies TechBook",

https://elabnavigator.emc.com/vault/pdf/Distance.pdf

This will also talk about the "Extended Fabric" license which is required, and a short chapter on "Data buffering and flow control" which might help troubleshoot.

and the other side when running on 8Gb:

er_enc_in 36 Encoding errors inside of frames

er_crc 19 Frames with CRC errors

er_trunc 0 Frames shorter than minimum

er_toolong 0 Frames longer than maximum

er_bad_eof 3 Frames with bad end-of-frame

er_enc_out 17043 Encoding error outside of frames

er_bad_os 17045 Invalid ordered set

er_rx_c3_timeout 0 Class 3 receive frames discardedout

er_tx_c3_timeout 0 Class 3 transmit frames discardeeout

er_c3_dest_unreach 0 Class 3 frames discarded due to unreachable

er_other_discard 0 Other discards

er_type1_miss 0 frames with FTB type 1 miss

er_type2_miss 0 frames with FTB type 2 miss

er_type6_miss 0 frames with FTB type 6 miss

er_zone_miss 0 frames with hard zoning miss

er_lun_zone_miss 0 frames with LUN zoning miss

er_crc_good_eof 16 Crc error with good eof

er_inv_arb 0 Invalid ARB

Hi,

According to your last post, we can see er_crc_good_eof in both ends:

er_crc_good_eof 58 Crc error with good eof

er_crc_good_eof 16 Crc error with good eof

So I suppose that there must be some element generating the errors in that link. The more speed the more sensitive and affected the switchs are by dust, a bad connection, sfp, etc.

Do you get these errors in both fabrics or just in one? If just in one, you can try to locate the faulty element by moving connections from one fabric to the other, with all that that implies...

thanks guys again, here are the errors of one side:

er_enc_in 67 Encoding errors inside of frames

er_crc 59 Frames with CRC errors

er_trunc 0 Frames shorter than minimum

er_toolong 0 Frames longer than maximum

er_bad_eof 1 Frames with bad end-of-frame

er_enc_out 375743 Encoding error outside of frames

er_bad_os 375747 Invalid ordered set

er_rx_c3_timeout 0 Class 3 receive frames discarded due to timeout

er_tx_c3_timeout 0 Class 3 transmit frames discarded due to timeout

er_c3_dest_unreach 0 Class 3 frames discarded due to destination unreachable

er_other_discard 0 Other discards

er_type1_miss 0 frames with FTB type 1 miss

er_type2_miss 0 frames with FTB type 2 miss

er_type6_miss 0 frames with FTB type 6 miss

er_zone_miss 0 frames with hard zoning miss

er_lun_zone_miss 0 frames with LUN zoning miss

er_crc_good_eof 58 Crc error with good eof

er_inv_arb 0 Invalid ARB

Hello RRR,

Did you look at setting the 8Gb/s fillword with the command: portCfgFillword ?

Best regards.

I allready tried to use the fillword with mode 3 and disabling and enabling the ports, but it does not matter. only on 4Gb there are no errors.

felipon, the problem is on both fabrics and cables has allready been replaced and we also moved to another single mode connection

I also upgraded to FOS 7.0.1, but makes no difference..

Only found some workaround to resolve this issue, but the workaround is not always working.

You can try to have a test in full Brocade Hardware environment, SFP and Switch and HBA are all shipped from Brocade.

It's a 8Gb/scompatitibility problem.

Can you explain me whether you are from EMC or not? besides this, I would like to know whether it is a Brocade specific 8Gb compat issue. By the way, the ISL is not functioning on 8Gb, while both switch sides are Brocade and also the LR 8Gb SFP's are Brocade, so actually the issue is completely Brocade regarded..