The PLC devices got package loss once connected to the office network

[ShermaineW]

We have a type of PLC controller in production, it was hard coded with IP address and no one knows how to change it. In the production Cell, there are 2 such controllers and 1 pc are connected to the internal switch. (dumb switch), and I call this is a cell. The PC can ping the controllers without single package loss if they not connected to my office network. (subnet Mask: /22, 1000 IPs), once the cell internal switch is linked to our office network (HP switches), the cell pc still can ping office gateway without any package loss, however the samepc wont be able to talk to the controller any more( they are connected to the same internal cell switch),  looks like the package get lost from time to time. I suspected it caused by the broadcast, multicast or unicast traffic in the office network, however I dont have much knowledge on that, I want do VLAN segement, but the PLC controller was hardcode with office IP and can not change it now, so I want know is there a way I check on my HP switch, what is happening and what cause the traffic drop, is there such tools and where to start.

PS, i set broadcast limit as 10% on the HP switch port. (The port linked to the Cell switch), and I did not see any difference.

Much appreciate any response on this.

Shermaine

[parnassus]

Hi!

well...would be useful to understand how you connected the "dumb" switch (used to create the PLC Cell) and the "intelligent" switch (used to serve the rest of your network).

I mean: how is configured the downlink port to your "dumb" switch? can you collect some CLI commands' outputs? supposing HP ProCurve switch series is used...go with show running configuration interface ethernet <x>...and show interface <x>...and show vlan port ethernet <x> details ...and show spanning-tree ethernet <x>...where <x> is the port id of the port used for the downlink.

We suppose the "dumb" switch is an unmanaged one, isn't it?

[ShermaineW]

Hi Parnassus,

Thank you for your reply. Yes, the Dumb switch means unmanged switch. The cell dumb switch is connected to HP switch (Layer2), and the HP switch is linked back to firewall. All in default VLAN1 , there is no additional configuration done on the HP switch earlier, recently I set the broadcast control of 10% only on the port, since the PLC is not working in office network, we temporarilly diconnect the cell dumb switch, instead of, a cell pc took the old uplink connection, connected to the HP switch, so the port information may be not relevent (I can arrange a time to duplicate the connection and get the log another time), and here are the ouput:

show int bri 33

Status and Counters - Port Status

| Intrusion MDI Flow Bcast
Port Type | Alert Enabled Status Mode Mode Ctrl Limit
----- --------- + --------- ------- ------ ---------- ----- ----- ------
33 100/1000T | No Yes Up 1000FDx MDI off 10

show int 33

Status and Counters - Port Counters for port 33

Name :
Link Status : Up
Totals (Since boot or last clear) :
Bytes Rx : 3,593,056,564 Bytes Tx : 3,566,144,197
Unicast Rx : 696,889,198 Unicast Tx : 880,447,993
Bcast/Mcast Rx : 64,543,236 Bcast/Mcast Tx : 2,196,207,697
Errors (Since boot or last clear) :
FCS Rx : 32 Drops Rx : 0
Alignment Rx : 2 Collisions Tx : 0
Runts Rx : 0 Late Colln Tx : 0
Giants Rx : 0 Excessive Colln : 0
Total Rx Errors : 36 Deferred Tx : 0
Rates (5 minute weighted average) :
Total Rx (bps) : 5065088 Total Tx (bps) : 5238920
Unicast Rx (Pkts/sec) : 18 Unicast Tx (Pkts/sec) : 16
B/Mcast Rx (Pkts/sec) : 1 B/Mcast Tx (Pkts/sec) : 159
Utilization Rx : 00.50 % Utilization Tx : 00.52 %

show vlan port ethernet 33 detai

Status and Counters - VLAN Information - for ports 33

VLAN ID Name Status Jumbo Mode
------- -------------------- ------------ ----- --------
1 DEFAULT_VLAN Port-based No Untagged

show spanning-tree ethernet 33

Multiple Spanning Tree (MST) Information

STP Enabled : Yes
Force Version : MSTP-operation
IST Mapped VLANs : 1-4094
Switch MAC Address : 3c4a92-7d2940
Switch Priority : 32768
Max Age : 20
Max Hops : 20
Forward Delay : 15

Topology Change Count : 385
Time Since Last Change : 24 hours

CST Root MAC Address : f40343-ce724b
CST Root Priority : 0
CST Root Path Cost : 20000
CST Root Port : 47

IST Regional Root MAC Address : 3c4a92-7d2940
IST Regional Root Priority : 32768
IST Regional Root Path Cost : 0
IST Remaining Hops : 20

Root Guard Ports :
TCN Guard Ports :
Protected Ports :
Filtered Ports :

| Prio | Designated Hello
Port Type | Cost rity State | Bridge Time PtP Edge
----- --------- + --------- ----- ---------- + ------------- ----- --- ----
33 100/1000T | 20000 128 Forwarding | 3c4a92-7d2940 2 Yes No

As you can see, there are not much configuration on the port,

Many thanks again

Shermaine

[ShermaineW]

more output:

show running

Running configuration:

; J9022A Configuration Editor; Created on release #N.11.76

hostname "MainServer-Switch-1"
time timezone -360
time daylight-time-rule Continental-US-and-Canada
no telnet-server
interface 33
broadcast-limit 10
exit
interface 42
name "PhoneSys2"
speed-duplex 100-full
exit
sntp server 192.168.104.13
timesync sntp
sntp unicast
logging 192.168.104.45
snmp-server community "public" Operator
snmp-server host 192.168.95.128 "public"
vlan 1
name "DEFAULT_VLAN"
untagged 1-48
ip address 192.168.104.2 255.255.252.0
exit
fault-finder bad-driver sensitivity high
fault-finder bad-transceiver sensitivity high
fault-finder bad-cable sensitivity high
fault-finder too-long-cable sensitivity high
fault-finder over-bandwidth sensitivity high
fault-finder broadcast-storm sensitivity high
fault-finder loss-of-link sensitivity high
fault-finder duplex-mismatch-HDx sensitivity high
fault-finder duplex-mismatch-FDx sensitivity high
banner motd "UNAUTHORIZED ACCESS TO THIS DEVICE IS PROHIBITED
You must have explicit, authorized permission to access or configure
this device.Unauthorized attempts and actions to access or use this
system may result in civil and/or criminal penalties.
All activities performed on this device are logged and monitored.
"
spanning-tree
ip ssh