Brocade switch port flaps with minimal media errors being reported

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

Specialty:: brocade

Last Updated:

Applies to

Brocade Switch

Issue

Brocade switch port flaps with minimal media errors being reported under porterrshow such as link fail, loss sig, uncorr and pcs errors on both the fabrics around same timestamp.

/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 346: 461.7m 94.4m 0 0 0 0 0 0 0 0 4 0 2 0 0 0 0 255 0

108: 447.8m 117.4m 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 3

Switchshow reports the port as online

/fabos/bin/switchshow : Index Slot Port Address Media Speed State Proto ============================================================ 346 10 42 6bd2c0 id N16 Online FC F-Port 21:00:00:24:cc:xx:yy:zz

"Loss of sync" events logged under errdump:

2023/12/24-05:53:33:343947 (IST), [C4-5040], 2014234/0, SLOT 2 | CHASSIS | PORT 11/12, INFO, Switch, Link loss of sync debouncing event detected: Slot 11/Port 108(124) Event=dead0bee Tov_Val=64., OID:0x43b28abc, SPOID:0x43b68xxx, c4_intr.c, line: 3849, comp:insmod, ltime:2023/12/24-05:53:33:343631

Fabriclog shows the port flapping happened just twice

Switch 0; Sat Apr 1 01:00:34 2023 IST (GMT+5:30) 01:00:34.971674 SCN Port Offline;rsn=0x4,g=0xe5a A2,P0 A2,P0 346 NA 01:00:34.971681 *Removing all nodes from port A2,P0 A2,P0 346 NA 01:00:34.984155 SCN LR_PORT(0);g=0xe5a A2,P0 A2,P0 346 NA 01:00:35.091854 SCN Port Online; g=0xe5a,isolated=0 A2,P0 A2,P1 346 NA 01:00:35.093200 Port Elp engaged A2,P1 A2,P0 346 NA 01:00:35.093218 *Removing all nodes from port A2,P0 A2,P0 346 NA 01:00:35.093446 SCN Port F_PORT A2,P1 A2,P0 346 NA 01:01:39.564758 SCN Port Offline;rsn=0x2,g=0xe5c A2,P0 A2,P0 346 NA 01:01:39.564764 *Removing all nodes from port A2,P0 A2,P0 346 NA 01:01:41.783142 SCN LR_PORT(0);g=0xe5c A2,P0 A2,P0 346 NA 01:01:41.842466 SCN Port Online; g=0xe5c,isolated=0 A2,P0 A2,P1 346 NA 01:01:41.842556 Port Elp engaged A2,P1 A2,P0 346 NA 01:01:41.842568 *Removing all nodes from port A2,P0 A2,P0 346 NA 01:01:41.842844 SCN Port F_PORT A2,P1 A2,P0 346 NA

Tx and Rx power are in optimal range on the switch end sfp.

============= Slot 11/Port 12: ============= Temperature: 59 Centigrade Current: 7.496 mAmps Voltage: 3306.8 mVolts RX Power: -1.7 dBm (677.8uW) TX Power: -0.2 dBm (959.7 uW)

Tx value is optimal but Rx is value is slightly low and is near to the threshold value under sfpshow.

Slot 10/Port 42: ============= Identifier: 3 SFP Connector: 7 LC Transceiver: 6804406000000000 8,16,32_Gbps M5 sw Inter,Short_dist [..] Vendor Name: BROCADE Vendor OUI: 00:05:1e Vendor PN: 57-1000333-01 [..] Temperature: 57 Centigrade Current: 6.026 mAmps Voltage: 3295.9 mVolts RX Power: -4.1 dBm (392.6uW) TX Power: -1.7 dBm (683.9 uW)