switch configuration when not only upstream ???

[IE-TopModel]

Hi 3com/HP fans,

We own a 3Com Switch 4200G 24-Port (Software Version 3Com OS V3.02.00s56), and HP has eaten 3com.

The switch works well with upstream/downstream traffic towards the internet.

But now we want cross-connections of the machines in our LAN.

Do I have to configure the switch differently if the connected machines shall see each other?

I ask because it is not working reliably now. It is a case of random chance if two computers see each other or not. Sometimes the routing suddenly works after a few hundred ping attempts, sometimes not even that happens.

This is critical, because all of the higher protocols that i want to implement between the machines work with problems right now. At first, I could not believe that the switch was the problem, but pinging has shown it. Please see this postings for more information:

http://h30499.www3.hp.com/t5/E-Series/4200G-needs-200-attempts-to-route/m-p/2328309

PLEASE look into our problem, it is unsolved for WEEKS now, and a lot of subsequent work depends on it.

Thanks a lot!

[Techno]

Sounds like you have loops on your networks, try enabling  RSTP and do a wirelshark trace to see what is going on if RSTP does not help.

Warranty will probably not cover you here as this is a Network and configuration issue and not a bug by the sound of things.

Hope this helps

[IE-TopModel]

This is the configuration, which I could now save, and export:

#
 sysname 4200G
#
 igmp-snooping enable
#
 queue-scheduler wrr group1 0 1 1 2 2 3 3 4 4 5 5 9 6 13 7 15 
#
radius scheme system
#
domain system 
#
local-user admin
 service-type ssh telnet terminal
 level 3
local-user manager
 password simple manager
 service-type ssh telnet terminal
 level 2
local-user monitor
 password simple monitor
 service-type ssh telnet terminal
 level 1
#
vlan 1
 igmp-snooping enable
#
interface Vlan-interface1
 ip address dhcp-alloc
#LOCCFG. MUST NOT DELETE
#
interface Aux1/0/0
#
interface GigabitEthernet1/0/1
 stp edged-port enable
 broadcast-suppression pps 3000
 undo jumboframe enable
 priority-trust cos
#

[repeats identically 23 times for ...]

interface GigabitEthernet1/0/2
[ ... to ...]
interface GigabitEthernet1/0/24
 

#
interface GigabitEthernet1/0/25
 stp edged-port enable
 broadcast-suppression pps 3000
 shutdown
 undo jumboframe enable
 priority-trust cos
#

[repeats identically 3 times for ...]

interface GigabitEthernet1/0/26
[... to ...]
interface GigabitEthernet1/0/28


#TOPOLOGYCFG. MUST NOT DELETE
#GLBCFG. MUST NOT DELETE
#
interface NULL0
#
 voice vlan mac-address 0004-0d00-0000 mask ffff-ff00-0000 description Avaya phone
 voice vlan mac-address 0060-b900-0000 mask ffff-ff00-0000 description Philips and NEC AG phone
#
 snmp-agent
 snmp-agent local-engineid 8000002B0024730EE1006877
 snmp-agent community read public 
 snmp-agent community write private 
 snmp-agent sys-info version all
#
 undo cluster enable 
#
user-interface aux 0
 authentication-mode scheme 
user-interface vty 0 4
 authentication-mode scheme 
#
return

What's wrong with it?

Thanks a lot!

[IE-TopModel]

Hi!

thanks for your answer, Tech Man :-)

I am so relieved that I finally get help.

Please study the configuration, cited above. Is that what you'd expect?

Shall I initialize the switch to factory settings?

> try enabling  RSTP

Where can I do that?

I have found several places where "MSTP" can be configured (whatever that is), and I have linked them here:

  http://h30499.www3.hp.com/t5/E-Series/RSTP-MSTP/td-p/2333685

But none where "RSTP" can be enabled.  Please be 4200G-specific, thanks.

> wirelshark trace

I have downloaded and installed wireshark.

(to my Macbook Air, connected by Belkin-USB-ethernet),

but it answers: "There are no interfaces on which a capture can be done."

> Sounds like you have loops on your networks

What are loops in networks?

All of our machines are only connected through that switch, and only once.

> Hope this helps

I haven't given up hope.