Hi All,I have connected few PCs with 2xICX6450-48 switch in local envrionment.Assigned private IPs(like 169.254.3.1-50) in my PCs. Now i see retransmission in TCP connections of many PCs, i checked switch for any problem but could not see any errors in either ethernet interfaces or stack interfaces.netstat O/P snippet on PC 169.254.3.31:2018-10-02 03:08:10 tcp 0 38093 169.254.3.31:53098 169.254.3.32:13602 ESTABLISHED 601 1280802 4486/xxx on (0.28/1/0)2018-10-02 03:38:10 tcp 0 996 169.254.3.31:46332 169.254.3.49:12602 ESTABLISHED 601 1689988 5919/xxx on (0.34/1/0)Switch stacking settings:all stack ports are 10G. I have configured stack ports on both switch units in trunk mode (Trunk1: [1/2/1, 1/2/2], Trunk2: [1/2/3, 1/2/4]). Firmware:I am using firmware 08.0.30When i checked command output “show stack rel-ipc”, i see a field “Data retransmits done: <value>”. Is it says switch is doing restarnsmission for packets.How to minimize it.Output of few diagnostic command:1>show version Copyright (c) 1996-2015 Brocade Communications Systems, Inc. All rights reserved. UNIT 1: compiled on Mar 30 2015 at 18:25:06 labeled as ICX64R08030 (9693416 bytes) from Primary ICX64R08030.bin SW: Version 08.0.30T313 UNIT 2: compiled on Mar 30 2015 at 18:25:06 labeled as ICX64R08030 (9693416 bytes) from Primary ICX64R08030.bin SW: Version 08.0.30T313 Boot-Monitor Image size = 786944, Version:10.1.05T310 (kxz10105) HW: Stackable ICX6450-48==========================================================================UNIT 1: SL 1: ICX6450-48 48-port Management Module Serial #: BZU3222L063 License: ICX6450_BASE_ROUTER_SOFT_PACKAGE (LID: dbwIHHHnFLI) P-ENGINE 0: type DEF0, rev 01 P-ENGINE 1: type DEF0, rev 01==========================================================================UNIT 1: SL 2: ICX6450-SFP-Plus 4port 40G Module==========================================================================UNIT 2: SL 1: ICX6450-48 48-port Management Module Serial #: BZU3220L094 License: ICX6450_BASE_ROUTER_SOFT_PACKAGE (LID: dbwIHHFnFOJ) P-ENGINE 0: type DEF0, rev 01 P-ENGINE 1: type DEF0, rev 01==========================================================================UNIT 2: SL 2: ICX6450-SFP-Plus 4port 40G Module========================================================================== 800 MHz ARM processor ARMv5TE, 400 MHz bus65536 KB flash memory 512 MB DRAMSTACKID 1 system uptime is 188 day(s) 14 hour(s) 20 minute(s) 18 second(s)STACKID 2 system uptime is 188 day(s) 15 hour(s) 1 minute(s) 13 second(s)The system started at 12:35:57 GMT+00 Wed Nov 29 2017 The system : started=warm start reloaded=by “reload”My stack unit ID = 1, bootup role = active****************************************************************************2>show stackStack Details=============T=508d9h20m42.3: alone: standalone, D: dynamic cfg, S: staticID Type Role Mac Address Pri State Comment 1 S ICX6450-48 active 609c.9f8f.dbc0 128 local Ready2 S ICX6450-48 standby 609c.9f8f.1bc0 0 remote Ready active standby +—+ +—+ =2/3| 1 |2/1==2/3| 2 |2/1= | +—+ +—+ | | | |————————| Standby u2 – protocols ready, can failoverCurrent stack management MAC is 609c.9f8f.dbc0Image-Auto-Copy is Enabled. Stack Port Status Neighbors Unit# Stack-port1 Stack-port2 Stack-port1 Stack-port2 1 up (1/2/1-1/2/2) up (1/2/3-1/2/4) U2 (2/2/3-2/2/4) U2 (2/2/1-2/2/2) 2 up (2/2/1-2/2/2) up (2/2/3-2/2/4) U1 (1/2/3-1/2/4) U1 (1/2/1-1/2/2) Unit# System uptime1 508 day(s) 9 hour(s) 20 minute(s) 42 second(s) 2 508 day(s) 9 hour(s) 18 minute(s) 19 second(s) The system started at 01:13:36 GMT+00 Sun May 07 20173> show mediaPort 1/1/1: Type : 1G M-C (Gig-Copper) Port 1/1/2: Type : 1G M-C (Gig-Copper) Port 1/1/3: Type : 1G M-C (Gig-Copper) Port 1/1/4: Type : 1G M-C (Gig-Copper) Port 1/1/5: Type : 1G M-C (Gig-Copper) Port 1/1/6: Type : 1G M-C (Gig-Copper) Port 1/1/7: Type : 1G M-C (Gig-Copper) Port 1/1/8: Type : 1G M-C (Gig-Copper) Port 1/1/9: Type : 1G M-C (Gig-Copper) Port 1/1/10: Type : 1G M-C (Gig-Copper) Port 1/1/11: Type : 1G M-C (Gig-Copper) Port 1/1/12: Type : 1G M-C (Gig-Copper) Port 1/1/13: Type : 1G M-C (Gig-Copper) Port 1/1/14: Type : 1G M-C (Gig-Copper) Port 1/1/15: Type : 1G M-C (Gig-Copper) Port 1/1/16: Type : 1G M-C (Gig-Copper) Port 1/1/17: Type : 1G M-C (Gig-Copper) Port 1/1/18: Type : 1G M-C (Gig-Copper) Port 1/1/19: Type : 1G M-C (Gig-Copper) Port 1/1/20: Type : 1G M-C (Gig-Copper) Port 1/1/21: Type : 1G M-C (Gig-Copper) Port 1/1/22: Type : 1G M-C (Gig-Copper) Port 1/1/23: Type : 1G M-C (Gig-Copper) Port 1/1/24: Type : 1G M-C (Gig-Copper) Port 1/1/25: Type : 1G M-C (Gig-Copper) Port 1/1/26: Type : 1G M-C (Gig-Copper) Port 1/1/27: Type : 1G M-C (Gig-Copper) Port 1/1/28: Type : 1G M-C (Gig-Copper) Port 1/1/29: Type : 1G M-C (Gig-Copper) Port 1/1/30: Type : 1G M-C (Gig-Copper) Port 1/1/31: Type : 1G M-C (Gig-Copper) Port 1/1/32: Type : 1G M-C (Gig-Copper) Port 1/1/33: Type : 1G M-C (Gig-Copper) Port 1/1/34: Type : 1G M-C (Gig-Copper) Port 1/1/35: Type : 1G M-C (Gig-Copper) Port 1/1/36: Type : 1G M-C (Gig-Copper) Port 1/1/37: Type : 1G M-C (Gig-Copper) Port 1/1/38: Type : 1G M-C (Gig-Copper) Port 1/1/39: Type : 1G M-C (Gig-Copper) Port 1/1/40: Type : 1G M-C (Gig-Copper) Port 1/1/41: Type : 1G M-C (Gig-Copper) Port 1/1/42: Type : 1G M-C (Gig-Copper) Port 1/1/43: Type : 1G M-C (Gig-Copper) Port 1/1/44: Type : 1G M-C (Gig-Copper) Port 1/1/45: Type : 1G M-C (Gig-Copper) Port 1/1/46: Type : 1G M-C (Gig-Copper) Port 1/1/47: Type : 1G M-C (Gig-Copper) Port 1/1/48: Type : 1G M-C (Gig-Copper) Port 1/2/1: Type : 10GE Active Twinax 1m (SFP +)Port 1/2/2: Type : 10GE Active Twinax 1m (SFP +)Port 1/2/3: Type : 10GE Active Twinax 1m (SFP +)Port 1/2/4: Type : 10GE Active Twinax 1m (SFP +)Port 2/1/1: Type : 1G M-C (Gig-Copper) Port 2/1/2: Type : 1G M-C (Gig-Copper) Port 2/1/3: Type : 1G M-C (Gig-Copper) Port 2/1/4: Type : 1G M-C (Gig-Copper) Port 2/1/5: Type : 1G M-C (Gig-Copper) Port 2/1/6: Type : 1G M-C (Gig-Copper) Port 2/1/7: Type : 1G M-C (Gig-Copper) Port 2/1/8: Type : 1G M-C (Gig-Copper) Port 2/1/9: Type : 1G M-C (Gig-Copper) Port 2/1/10: Type : 1G M-C (Gig-Copper) Port 2/1/11: Type : 1G M-C (Gig-Copper) Port 2/1/12: Type : 1G M-C (Gig-Copper) Port 2/1/13: Type : 1G M-C (Gig-Copper) Port 2/1/14: Type : 1G M-C (Gig-Copper) Port 2/1/15: Type : 1G M-C (Gig-Copper) Port 2/1/16: Type : 1G M-C (Gig-Copper) Port 2/1/17: Type : 1G M-C (Gig-Copper) Port 2/1/18: Type : 1G M-C (Gig-Copper) Port 2/1/19: Type : 1G M-C (Gig-Copper) Port 2/1/20: Type : 1G M-C (Gig-Copper) Port 2/1/21: Type : 1G M-C (Gig-Copper) Port 2/1/22: Type : 1G M-C (Gig-Copper) Port 2/1/23: Type : 1G M-C (Gig-Copper) Port 2/1/24: Type : 1G M-C (Gig-Copper) Port 2/1/25: Type : 1G M-C (Gig-Copper) Port 2/1/26: Type : 1G M-C (Gig-Copper) Port 2/1/27: Type : 1G M-C (Gig-Copper) Port 2/1/28: Type : 1G M-C (Gig-Copper) Port 2/1/29: Type : 1G M-C (Gig-Copper) Port 2/1/30: Type : 1G M-C (Gig-Copper) Port 2/1/31: Type : 1G M-C (Gig-Copper) Port 2/1/32: Type : 1G M-C (Gig-Copper) Port 2/1/33: Type : 1G M-C (Gig-Copper) Port 2/1/34: Type : 1G M-C (Gig-Copper) Port 2/1/35: Type : 1G M-C (Gig-Copper) Port 2/1/36: Type : 1G M-C (Gig-Copper) Port 2/1/37: Type : 1G M-C (Gig-Copper) Port 2/1/38: Type : 1G M-C (Gig-Copper) Port 2/1/39: Type : 1G M-C (Gig-Copper) Port 2/1/40: Type : 1G M-C (Gig-Copper) Port 2/1/41: Type : 1G M-C (Gig-Copper) Port 2/1/42: Type : 1G M-C (Gig-Copper) Port 2/1/43: Type : 1G M-C (Gig-Copper) Port 2/1/44: Type : 1G M-C (Gig-Copper) Port 2/1/45: Type : 1G M-C (Gig-Copper) Port 2/1/46: Type : 1G M-C (Gig-Copper) Port 2/1/47: Type : 1G M-C (Gig-Copper) Port 2/1/48: Type : 1G M-C (Gig-Copper) Port 2/2/1: Type : 10GE Active Twinax 1m (SFP +)Port 2/2/2: Type : 10GE Active Twinax 1m (SFP +)Port 2/2/3: Type : 10GE Active Twinax 1m (SFP +)Port 2/2/4: Type : 10GE Active Twinax 1m (SFP +)4> show stack stack-portsPort statistics for all stack-ports.Port In Packets Out Packets In Errors Out Errors1/2/1 1370 519 0 01/2/2 595 1446 0 01/2/3 1451 567 0 01/2/4 519 1416 0 02/2/1 0 0 0 02/2/2 0 0 0 02/2/3 0 0 0 02/2/4 0 0 0 0TOTAL 3935 3948 0 05>show stack rel-ipcStack IPC Statistics.Reliable IPC statistics:Global statistics:Pkts rcvd w/no session: 0, Msgs rcvd w/no handler: % 0Keep-alive timer 05ee4098, Keep-alive # 8784506Unit statistics:Unit 2 statistics:Msgs sent: 17761125 Msgs received: 28675248, Pkt sends failed: 0Message types sent: [9]=17714249, [12]=9, [13]=4, [15]=46859, [21]=3, [59]=1, Message types received: [9]=28675243, [12]=1, [13]=2, [15]=2, Session: base-channel, to U2, channel 0buf size: xmt=1048584, rcv=32776, max msg=10008State: established (last 508 day(s) 9 hour(s) 17 minute(s) 39 second(s) ago) cnt: 1Remote resets: 0, Reset packets sent: 0Connection statistics (for current connection, if established):Msgs sent: 12281686, Msgs rcvd: 28675240Atomic batches sent: 0, Atomic batches rcvd: 0Pkts sent: 49225734, Pkts rcvd: 39627955Msg bytes sent: 321000512, Msg bytes rcvd: 118436004Pkt bytes sent: 140614160, Pkt bytes rcvd: 258315396Keepalive sent: 8784490, Keepalive rcvd: 8784490Keepalive age: 0, Keepalive NBR age : 1Flushes requested: 1631, Suspends: 0, Resumes: 0Packets sent with data (DAT), ACKs, and window updates (WND):Other: 10446154, ACK: 22019942, WND: 1801900, ACK+WND: 19309DAT: 14716923, DAT+ACK: 215330, DAT+WND 6115, DA+AC+WND 61Data retransmits done: 2511094, Zero-window probes sent: 0Dup ACK pkts rcvd: 1983261, Pkts rcvd w/dup data: 54Pkts rcvd w/data past window: 0Session: image-transfer, to U2, channel 1buf size: xmt=15368, rcv=15368, max msg=1052State: established (last 508 day(s) 9 hour(s) 17 minute(s) 36 second(s) ago) cnt: 1Remote resets: 0, Reset packets sent: 0Connection statistics (for current connection, if established):Msgs sent: 0, Msgs rcvd: 1Atomic batches sent: 0, Atomic batches rcvd: 0Pkts sent: 8784556, Pkts rcvd: 11Msg bytes sent: 0, Msg bytes rcvd: 8Pkt bytes sent: 105508812, Pkt bytes rcvd: 144Keepalive sent: 8784489, Keepalive rcvd: 8784489Keepalive age: 1, Keepalive NBR age : 1Flushes requested: 0, Suspends: 0, Resumes: 0Packets sent with data (DAT), ACKs, and window updates (WND):Other: 8784490, ACK: 1, WND: 0, ACK+WND: 0DAT: 65, DAT+ACK: 0, DAT+WND 0, DA+AC+WND 0Data retransmits done: 64, Zero-window probes sent: 0Dup ACK pkts rcvd: 6, Pkts rcvd w/dup data: 0Pkts rcvd w/data past window: 0Session: ACL, to U2, channel 3buf size: xmt=102408, rcv=32776, max msg=1472State: established (last 508 day(s) 9 hour(s) 17 minute(s) 39 second(s) ago) cnt: 1Remote resets: 0, Reset packets sent: 0Connection statistics (for current connection, if established):Msgs sent: 5432444, Msgs rcvd: 4Atomic batches sent: 0, Atomic batches rcvd: 0Pkts sent: 15414196, Pkts rcvd: 6417623Msg bytes sent: 117348590, Msg bytes rcvd: 5664Pkt bytes sent: 164358895, Pkt bytes rcvd: 77022964Keepalive sent: 8784490, Keepalive rcvd: 87844906>show statisticsPort In Packets Out Packets In Errors Out Errors1/1/1 11 7297 0 01/1/2 14 7298 0 01/1/3 8176 6415 0 01/1/4 2252685 2077557 0 01/1/5 5226 6532 0 01/1/6 2259156 2075034 0 01/1/7 13 7299 0 01/1/8 11 7297 0 01/1/9 14 7297 0 01/1/10 1086615 1084224 0 01/1/11 1073359 1070328 0 01/1/12 1072546 1067630 0 01/1/13 1096400 1092858 0 01/1/14 1081252 1078597 0 01/1/15 972004 968706 0 01/1/16 1091781 1088888 0 01/1/17 1062311 1060119 0 01/1/18 984911 982314 0 01/1/19 1130107 1126269 0 01/1/20 1188384 1185328 0 01/1/21 1105326 1100925 0 01/1/22 1429199 1426992 0 01/1/23 1392828 1389422 0 01/1/24 1116379 1111288 0 01/1/25 0 0 0 01/1/26 0 0 0 01/1/27 2451 7641 0 01/1/28 2529724 2172382 0 01/1/29 10149 7220 0 01/1/30 1235062 2073628 0 01/1/31 0 7286 0 01/1/32 0 7285 0 01/1/33 0 7286 0 01/1/34 1086603 1084228 0 01/1/35 1073354 1071981 0 01/1/36 1072552 1071856 0 01/1/37 1096316 1095985 0 01/1/38 1081210 1079800 0 01/1/39 972007 969592 0 01/1/40 1091794 1090130 0 01/1/41 1062292 1061034 0 01/1/42 984915 983945 0 01/1/43 1130164 1128059 0 01/1/44 1188441 1187810 0 01/1/45 1105352 1103770 0 01/1/46 1429184 1431086 0 01/1/47 1392891 1390305 0 01/1/48 1116339 1114779 0 01/2/1 7198974 3397392 0 01/2/2 3442180 &nb