Data Retransmission in Brocade ICX6450-48 2 stacked switch

manish_singh_7n — Thu, 04 Oct 2018 05:48:08 GMT

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 08.0.30

When i checked command output "show stack rel-ipc", i see a field "Data retransmits done: ". 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 bus
65536 KB flash memory
512 MB DRAM
STACKID 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 stack

Stack Details
=============
T=508d9h20m42.3: alone: standalone, 😧 dynamic cfg, S: static
ID   Type          Role    Mac Address    Pri State   Comment
1 S ICX6450-48    active 609c.9f8f.dbc0 128 local   Ready
2 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 failover
Current stack management MAC is 609c.9f8f.dbc0

Image-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 uptime
1     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 2017

3> show media

Port 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-ports
Port statistics for all stack-ports.

Port            In Packets          Out Packets       In Errors      Out Errors
1/2/1                 1370                  519               0               0
1/2/2                  595                 1446               0               0
1/2/3                 1451                  567               0               0
1/2/4                  519                 1416               0               0
2/2/1                    0                    0               0               0
2/2/2                    0                    0               0               0
2/2/3                    0                    0               0               0
2/2/4                    0                    0               0               0

TOTAL                 3935                 3948               0               0

5>show stack rel-ipc

Stack IPC Statistics.
Reliable IPC statistics:

Global statistics:
Pkts rcvd w/no session:           0,      Msgs rcvd w/no handler: %         0
Keep-alive timer           05ee4098,      Keep-alive #                8784506

Unit statistics:

Unit 2 statistics:
Msgs sent: 17761125 Msgs received: 28675248, Pkt sends failed: 0

Message 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 0
buf size: xmt=1048584, rcv=32776, max msg=10008
State: established (last 508 day(s) 9 hour(s) 17 minute(s) 39 second(s) ago) cnt: 1
Remote resets:                    0,      Reset packets sent:               0
Connection statistics (for current connection, if established):
Msgs sent:                 12281686,      Msgs rcvd:                 28675240
Atomic batches sent:              0,      Atomic batches rcvd:              0
Pkts sent:                 49225734,      Pkts rcvd:                 39627955
Msg bytes sent:           321000512,      Msg bytes rcvd:           118436004
Pkt bytes sent:           140614160,      Pkt bytes rcvd:           258315396
Keepalive sent:             8784490,      Keepalive rcvd:             8784490
Keepalive age:                    0,      Keepalive NBR age :               1
Flushes requested: 1631, Suspends: 0, Resumes: 0
Packets sent with data (DAT), ACKs, and window updates (WND):
Other: 10446154, ACK:     22019942, WND:       1801900, ACK+WND:     19309
DAT:   14716923, DAT+ACK:   215330, DAT+WND       6115, DA+AC+WND       61
Data retransmits done:      2511094,      Zero-window probes sent:          0
Dup ACK pkts rcvd:          1983261,      Pkts rcvd w/dup data:            54
Pkts rcvd w/data past window: 0

Session: image-transfer, to U2, channel 1
buf size: xmt=15368, rcv=15368, max msg=1052
State: established (last 508 day(s) 9 hour(s) 17 minute(s) 36 second(s) ago) cnt: 1
Remote resets:                    0,      Reset packets sent:               0
Connection statistics (for current connection, if established):
Msgs sent:                        0,      Msgs rcvd:                        1
Atomic batches sent:              0,      Atomic batches rcvd:              0
Pkts sent:                  8784556,      Pkts rcvd:                       11
Msg bytes sent:                   0,      Msg bytes rcvd:                   8
Pkt bytes sent:           105508812,      Pkt bytes rcvd:                 144
Keepalive sent:             8784489,      Keepalive rcvd:             8784489
Keepalive age:                    1,      Keepalive NBR age :               1
Flushes requested: 0, Suspends: 0, Resumes: 0
Packets sent with data (DAT), ACKs, and window updates (WND):
Other: 8784490, ACK:            1, WND:             0, ACK+WND:         0
DAT:         65, DAT+ACK:        0, DAT+WND          0, DA+AC+WND        0
Data retransmits done:           64,      Zero-window probes sent:          0
Dup ACK pkts rcvd:                6,      Pkts rcvd w/dup data:             0
Pkts rcvd w/data past window: 0

Session: ACL, to U2, channel 3
buf size: xmt=102408, rcv=32776, max msg=1472
State: established (last 508 day(s) 9 hour(s) 17 minute(s) 39 second(s) ago) cnt: 1
Remote resets:                    0,      Reset packets sent:               0
Connection statistics (for current connection, if established):
Msgs sent:                  5432444,      Msgs rcvd:                        4
Atomic batches sent:              0,      Atomic batches rcvd:              0
Pkts sent:                 15414196,      Pkts rcvd:                  6417623
Msg bytes sent:           117348590,      Msg bytes rcvd:                5664
Pkt bytes sent:           164358895,      Pkt bytes rcvd:            77022964
Keepalive sent:             8784490,      Keepalive rcvd:             8784490

6>show statistics
Port             In Packets       Out Packets       In Errors      Out Errors
1/1/1                    11              7297               0               0
1/1/2                    14              7298               0               0
1/1/3                  8176              6415               0               0
1/1/4               2252685           2077557               0               0
1/1/5                  5226              6532               0               0
1/1/6               2259156           2075034               0               0
1/1/7                    13              7299               0               0
1/1/8                    11              7297               0               0
1/1/9                    14              7297               0               0
1/1/10              1086615           1084224               0               0
1/1/11              1073359           1070328               0               0
1/1/12              1072546           1067630               0               0
1/1/13              1096400           1092858               0               0
1/1/14              1081252           1078597               0               0
1/1/15               972004            968706               0               0
1/1/16              1091781           1088888               0               0
1/1/17              1062311           1060119               0               0
1/1/18               984911            982314               0               0
1/1/19              1130107           1126269               0               0
1/1/20              1188384           1185328               0               0
1/1/21              1105326           1100925               0               0
1/1/22              1429199           1426992               0               0
1/1/23              1392828           1389422               0               0
1/1/24              1116379           1111288               0               0
1/1/25                    0                 0               0               0
1/1/26                    0                 0               0               0
1/1/27                 2451              7641               0               0
1/1/28              2529724           2172382               0               0
1/1/29                10149              7220               0               0
1/1/30              1235062           2073628               0               0
1/1/31                    0              7286               0               0
1/1/32                    0              7285               0               0
1/1/33                    0              7286               0               0
1/1/34              1086603           1084228               0               0
1/1/35              1073354           1071981               0               0
1/1/36              1072552           1071856               0               0
1/1/37              1096316           1095985               0               0
1/1/38              1081210           1079800               0               0
1/1/39               972007            969592               0               0
1/1/40              1091794           1090130               0               0
1/1/41              1062292           1061034               0               0
1/1/42               984915            983945               0               0
1/1/43              1130164           1128059               0               0
1/1/44              1188441           1187810               0               0
1/1/45              1105352           1103770               0               0
1/1/46              1429184           1431086               0               0
1/1/47              1392891           1390305               0               0
1/1/48              1116339           1114779               0               0
1/2/1               7198974           3397392               0               0
1/2/2               3442180           7340072               0               0
1/2/3               7258712           3107853               0               0
1/2/4               3271761           7314237               0               0
2/1/1                    15              7299               0               0
2/1/2                     0                 0               0               0
2/1/3                  3875              6973               0               0
2/1/4               2776323           2174619               0               0
2/1/5                  7677              8996               0               0
2/1/6               1437566           2171984               0               0
2/1/7                    11              7298               0               0
2/1/8                    10              7298               0               0
2/1/9                    12              7299               0               0
2/1/10              1086634           1084335               0               0
2/1/11              1073553           1070518               0               0
2/1/12              1072521           1069722               0               0
2/1/13              1096591           1093576               0               0
2/1/14              1081431           1077212               0               0
2/1/15               972102            970561               0               0
2/1/16              1091873           1087714               0               0
2/1/17              1062343           1059173               0               0
2/1/18               984938            982404               0               0
2/1/19              1130202           1126712               0               0
2/1/20              1188357           1184332               0               0
2/1/21              1105543           1102413               0               0
2/1/22              1431895           1429690               0               0
2/1/23              1393839           1389861               0               0
2/1/24              1116512           1112062               0               0
2/1/25                    0                 0               0               0
2/1/26                    0                 0               0               0
2/1/27                 6027              7927               0               0
2/1/28              2116140           2074953               0               0
2/1/29                 7629              9234               0               0
2/1/30              2167884           2172658               0               0
2/1/31                    0              7290               0               0
2/1/32                    0              7290               0               0
2/1/33                    0              7289               0               0
2/1/34              1086717           1085155               0               0
2/1/35              1073542           1072815               0               0
2/1/36              1072523           1071789               0               0
2/1/37              1096526           1096396               0               0
2/1/38              1081408           1081033               0               0
2/1/39               972109            970778               0               0
2/1/40              1091871           1089908               0               0
2/1/41              1062282           1062794               0               0
2/1/42               984942            984964               0               0
2/1/43              1130137           1128547               0               0
2/1/44              1188344           1187490               0               0
2/1/45              1105523           1103301               0               0
2/1/46              1431863           1430917               0               0
2/1/47              1393812           1393012               0               0
2/1/48              1116463           1115752               0               0
2/2/1               3108671           7260442               0               0
2/2/2               7316239           3273110               0               0
2/2/3               3398236           7200568               0               0
2/2/4               7341952           3443740               0               0
mgmt1                     0                 0               0               0

TOTAL             126705798         126913759               0               0

7> dm statistics
real_transition-transit-sw_reset-discards:
9-0-0-0(1/1/1) 1-0-0-0(1/1/2) 1-0-0-0(1/1/3) 1-0-0-0(1/1/4)
1-0-0-0(1/1/5) 1-0-0-0(1/1/6) 1-0-0-0(1/1/7) 1-0-0-0(1/1/8)
1-0-0-0(1/1/9) 23-0-0-0(1/1/10) 25-0-0-0(1/1/11) 27-0-0-0(1/1/12)
39-0-0-0(1/1/13) 25-0-0-0(1/1/14) 25-0-0-0(1/1/15) 31-0-0-0(1/1/16)
27-0-0-0(1/1/17) 25-0-0-0(1/1/18) 25-0-0-0(1/1/19) 79-0-0-0(1/1/20)
47-0-0-0(1/1/21) 35-0-0-0(1/1/22) 43-0-0-0(1/1/23) 39-0-0-0(1/1/24)
0-0-0-0(1/1/25) 0-0-0-0(1/1/26) 1-0-0-0(1/1/27) 1-0-0-0(1/1/28)
1-0-0-0(1/1/29) 1-0-0-0(1/1/30) 1-0-0-0(1/1/31) 1-0-0-0(1/1/32)
1-0-0-0(1/1/33) 23-0-0-0(1/1/34) 25-0-0-0(1/1/35) 27-0-0-0(1/1/36)
35-0-0-0(1/1/37) 25-0-0-0(1/1/38) 25-0-0-0(1/1/39) 29-0-0-0(1/1/40)
27-0-0-0(1/1/41) 25-0-0-0(1/1/42) 25-0-0-0(1/1/43) 67-0-0-0(1/1/44)
43-0-0-0(1/1/45) 31-0-0-0(1/1/46) 39-0-0-0(1/1/47) 39-0-0-0(1/1/48)
7-0-0-0(1/2/1) 3-0-0-0(1/2/2) 3-0-0-0(1/2/3) 7-0-0-0(1/2/4)
1-0-0-0(2/1/1) 0-0-0-0(2/1/2) 1-0-0-0(2/1/3) 1-0-0-0(2/1/4)
1-0-0-0(2/1/5) 1-0-0-0(2/1/6) 3-0-0-0(2/1/7) 1-0-0-0(2/1/8)
5-0-0-0(2/1/9) 23-0-0-0(2/1/10) 25-0-0-0(2/1/11) 27-0-0-0(2/1/12)
39-0-0-0(2/1/13) 25-0-0-0(2/1/14) 25-0-0-0(2/1/15) 31-0-0-0(2/1/16)
27-0-0-0(2/1/17) 25-0-0-0(2/1/18) 25-0-0-0(2/1/19) 79-0-0-0(2/1/20)
47-0-0-0(2/1/21) 35-0-0-0(2/1/22) 43-0-0-0(2/1/23) 39-0-0-0(2/1/24)
0-0-0-0(2/1/25) 0-0-0-0(2/1/26) 1-0-0-0(2/1/27) 1-0-0-0(2/1/28)
1-0-0-0(2/1/29) 1-0-0-0(2/1/30) 1-0-0-0(2/1/31) 1-0-0-0(2/1/32)
1-0-0-0(2/1/33) 23-0-0-0(2/1/34) 25-0-0-0(2/1/35) 27-0-0-0(2/1/36)
35-0-0-0(2/1/37) 25-0-0-0(2/1/38) 25-0-0-0(2/1/39) 29-0-0-0(2/1/40)
27-0-0-0(2/1/41) 25-0-0-0(2/1/42) 25-0-0-0(2/1/43) 67-0-0-0(2/1/44)
43-0-0-0(2/1/45) 31-0-0-0(2/1/46) 39-0-0-0(2/1/47) 39-0-0-0(2/1/48)
1-0-0-0(2/2/1) 5-0-0-0(2/2/2) 3-0-0-0(2/2/3) 1-0-0-0(2/2/4)

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

jijo_panangat — Thu, 04 Oct 2018 07:42:54 GMT

It seems you are using APIPA range on the PCs. When the DHCP process fails, Windows automatically assigns an IP address from the private range, which is 169.254.0.1 to 169.254.255.254.

APIPA addresses do not fall into any of the private IP address ranges defined by the Internet Protocol standard and are restricted for use on local networks only. Like private IP addresses, ping tests or any other connection requests from the internet and other outside networks cannot be made to APIPA devices directly.Please use standard IP address ranges and test.

Secondly, could you clarify what are the applications running on the PCs using TCP ports ?

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

manish_singh_7n — Thu, 04 Oct 2018 08:37:02 GMT

Hi Panangat,

Thanks for your reply.

I am not using APIPA, DHCP configuration is used.

The whole setup is in a local network.

I am using some backup application on those tcp ports.

Moreover, stack statistics, and Ethernet port statistics are taken after running "clear statistics" command, so they are showing current statistics, may not show actual figures from start.

Can you suggest any problem in switch, looking at "show stack rel-ipc" output, particularly below field,

Data retransmits done: 2511094

Is switch responsible for retransmissions?

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

howardtopher — Thu, 04 Oct 2018 21:30:31 GMT

It's a bad idea to use the APIPA address range for anything you rely on. If you're handing that out through DHCP, I would recommend changing that.

You're showing statistics for interprocessor communication. That has nothing to do with actual data transferring through the switch. Seeing data retransmits under the IPC stats is normal. Based on what you've shown, I see no issues.

You are running version 8.0.30 on that switch (circa 2015). I would update them to a newer version. 8.0.30sa is the newest. I've been running 8.0.30r on all my 6450s (150+) with no problems.

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

netwizz — Fri, 05 Oct 2018 17:51:02 GMT

I was going to say the same thing about avoiding APIPA Ip's. If you want something private please use something (non-overlapping) within:

192.168.0.0/16
172.16.0.0/12
10.0.0.0/8

***

As for stacking, it has had numerous bug fixes in the 08030 family codebase. Specifically, I can assure you to avoid "N" and "P" like the plague.

That said, "MB" was great, "Q" was just fine; we never tried "R," but the poster above is happy with it. Regardless, are just now deploying "SA" - which is the latest and has been trouble-free for us though we have it on only on a handful of our switches at this time. Though the sample set is in production on 6430's and 6450's as well as 6610's in both the Layer-2 and the Layer-3 flavors. Thus far, it's fine.

That said, it will be a while (week or two) before my entire environment runs all SA on any device running the 08030 ICX family codebase.

I repeat that I would NOT run the very first build of 08030 - especially in a stack environment!

____________

If you have any ICX7xxx series, you need at least 08061 to properly support stacking - at least on the 7150's, but let me assure you 08071 builds are of better quality being they fixed a certain NTP bug. Regardless, either is stable in a stack environment and certainly won't have traffic problems. We are just now testing the 08080 branch.... Intend to roll that out before Halloween. Have over 500+ Ruckus/Brocade devices in our environment.

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Data Retransmission in Brocade ICX6450-48 2 stacked switch

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch

Re: Data Retransmission in Brocade ICX6450-48 2 stacked switch