Brocade FC port flapped with multiple errors due to SFP not seated properly

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Category:: fabric-interconnect-and-management-switches

Specialty:: brocade

Last Updated:

Applies to

Brocade switch
FCP

Issue

Brocade FC port is online and in In_Sync state as per switchshow output.

Index Slot Port Address Media Speed State Proto ============================================================ 233 11 25 6vxcxc id N32 Online FC F-Port 1 N Port + 1 NPIV public

In porterrshow, disc c3 and c3timeout tx errors are seen along with link fail and loss sync for this port.

/fabos/cliexec/porterrshow: frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout pcs uncor tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx err err 233: 42.2g 52.2g 0 0 0 0 0 0 0 1.4k 6 4 0 0 0 1.4k 0 0 0

Rx & Tx values are in optimal range as per sfpshow output.

Slot 11/Port 25: ============= Identifier: 3 SFP Connector: 7 LC [..] Vendor Name: BROCADE Vendor OUI: 00:05:1e Vendor PN: 57-1000333-01 [...] RX Power: -0.9 dBm (807.10uW) TX Power: 0.4 dBm (1087.50 uW)

As per fabric logs port went offline & online also lot of Link resets, LR_IN & LR_OUT are seen as well.

Switch 0; Wed Dec 18 02:17:35 2024 IST (GMT+5:30) 23:42:40.741146 SCN LR_PORT(0);g=0x0 LR_IN D0,P0 D0,P0 233 NA 23:42:50.725148 SCN LR_PORT(0);g=0x0 LR_IN D0,P0 D0,P0 233 NA 23:44:54.098248 SCN LR_PORT(0);g=0x0 LR_OUT D0,P0 D0,P0 233 NA 23:54:41.867639 SCN LR_PORT(0);g=0x0 LR_OUT D0,P0 D0,P0 233 NA 02:43:35.902334 SCN Port Offline;rsn=0x4,g=0x454 D0,P0 D0,P0 233 NA 02:43:35.902340 *Removing all nodes from port D0,P0 D0,P0 233 NA 02:43:35.934603 SCN LR_PORT(0);g=0x454 D0,P0 D0,P0 233 NA 02:43:40.879145 SCN LR_PORT(0);g=0x454 D0,P0 D0,P0 233 NA 02:43:40.942477 SCN Port Online; g=0x454,isolated=0 D0,P0 D0,P1 233 NA 02:43:40.942550 Port Elp engaged D0,P1 D0,P0 233 NA 02:43:40.942562 *Removing all nodes from port D0,P0 D0,P0 233 NA

As per errdump logs, port encountered frame timeout detected errors and and C3timeout Tx C3TXTO errors, along with these IO_FRAME_LOSS and IO_LATENCY_CLEAR are also seen.

2024/12/18-23:43:10 (IST), [MAPS-1001], 745461, SLOT 2 | FID 128 | PORT 11/25, CRITICAL, switch1, VSP_xcxcx_S0xcxcxR07_xcx-7x, F-Port 11/25, Condition=ALL_TARGET_PORTS(C3TXTO/min>3), Current Value:[C3TXTO, 12 Timeouts], RuleName=defALL_TARGET_PORTSC3TXTO_3, Dashboard Category=Port Health, Quiet Time=None. 2024/12/18-23:43:11 (IST), [AN-1014], 745462, SLOT 2 | FID 128, INFO, switch1, Frame timeout detected, tx port 11/25 rx port 11/20, sid 6xxdd0, did 6xxss1, timestamp 2024-12-18 23:43:11 . 2024/12/18-23:43:17 (IST), [MAPS-1001], 745560, SLOT 2 | FID 128 | PORT 11/25, CRITICAL, switch1, VSP_xcxcx_S0xcxcxR07_xcx-7x, F-Port 11/25, Condition=ALL_PORTS(DEV_LATENCY_IMPACT/NONE==IO_FRAME_LOSS), Current Value:[DEV_LATENCY_IMPACT, IO_FRAME_LOSS, (138 C3TX Timeouts) ], RuleName=defALL_PORTS_IO_FRAME_LOSS_UNQUAR, Dashboard Category=Fabric Performance Impact, Quiet Time=15 min. 2024/12/18-23:59:17 (IST), [MAPS-1005], 745890, SLOT 2 | FID 128 | PORT 11/25, WARNING, switch1, VSP_xcxcx_S0xcxcxR07_xcx-7x, F-Port 11/25, Condition=ALL_PORTS(DEV_LATENCY_IMPACT/NONE==IO_LATENCY_CLEAR), Current Value:[DEV_LATENCY_IMPACT, IO_LATENCY_CLEAR], Rule defALL_PORTS_IO_LATENCY_CLEAR triggered 6 times in 15 min and last trigger time Wed Dec 18 23:55:07 2024, Dashboard Category=Fabric Performance Impact.

Below troubleshooting steps can be followed to isolate the issue and before proceeding with solution.
- Clean the connectors on either ends and reseat the cable.
- Check the patch panel as well.
- Check if cable passes the fluke meter test successfully.