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Conneting 3com 3300 switch

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9 replies

by adavi

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I expanded my network to a new building about 60meters away. The main building has a Superstack II 3300 switch with 2 3com Dual speed baseline hub working perfectly.
The new building also have a 3com Superstack 3 3300 switch and 2 d 3com dual speed baselin hub. I link the two switch through a cat 5e cross-wired cable since all port are MDIX. It will not communicate rather at the superstack 3, it bflash green light. With the same wire I connected from a hub in the main building to the new switch and it worked. can anybody help on what have I done wrong that prevented the two switch from communicating directly.
i need a help urgently
mu email is adabara@yahoo.com for any helper

9 replies

by ins413

I'm sure you probably already tried this, but I'm going to put it out there anyways. Sometimes, it's the little things that get us. Did you try a straight through cable on the uplinks ports. Only one switch needs to be uplinked and the other onlyneeds to be connected to a port. Hope I didn't state the obvious.

by adavi

The 3300 Switch does not have any special uplink port. All the ports are 10/100 MDIX port which should under normal circumstance communicate only on crossover cable as I have done. switch 1 is 3com 3300 superstack II swicth while switch 2 is 3com 3300 superstack 3 switch. More suggestion needed. Thanks.

by rogerndgreen

Have you tried locking down the speed of the ports on the two 3300s that are talking?
I would lock them both to 100MB FD - don't rely on the autonegotiation to work correctly. If this doesn't work, try 100MB HD, 10MB FD, 10MB HD (in that order) until you come up with a winning solution.
When you have tried to connect the two 3300s together, have they been in the same room (like the original 3300 & hub) or separated into the two buildings? There may be some electrical interference along the cable run between the two buildings.
If you have allocated an IP address for management purposes to the 3300s, have you used different addresses (with a suitable router, if required)? This shouldn't stop the two switches talking, but I have found quite a lot of 3Com switches doing things "that shouldn't happen" for no reason apart from being 3Com!
Best I can come up with at the moment!

Happy New Year!

Roger

by kjones

A green flashing light is usually the port is disabled. To change this either telnet or connect a terminal to the back of the switch and access the logon screen. Then type the following:-

ethernet portstate X ena
ethernet autoneg X ena

X=Port Number.

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