Stacking switches and IP Addresses

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Networking
Networking Equipment
Switches
Hi there, I have four 3Com 3300 switches that I have connected via Matrix cables (I think that's what they're called) and I was wondering what IP addresses I assign them? Do they all have the same IP address as they are operating as one combined unit or different IP addresses? I'm new to this kind of thing so any help would be appreciated. Thank you.
ASKED: April 5, 2005  5:10 AM
UPDATED: November 28, 2007  8:43 PM

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One ip address

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  • Jtennyson
    One ip address
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  • Rastafari
    Thank you, it's a start :) ok so I've assigned them all 1 IP address, I have given them all our networks subnet mask of 255.255.254.0 and our default gateway. What I'm not to sure about are the SLIP options? I really don't know what to put in there. Just to explain the scenario. I have a network cable connected to a switch in the room which provides this rooms network connectivity. The other end of the cable connects in to port 24 on Unit 1 of the 3300 3Com switch. I then have 3 other 3300's connected via matrix cables. When I connect my pc to the unit 1 or any other other, I get no network connectivity and XP pops up a window saying limited or no network connectivity. I also cannot ping the IP address I assigned to the switches. Something is blocking the connection and I'm not sure where. I hope that all makes sense and someone can decipher an answer :) Thanks again.
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  • DrillO
    I'm not sure what you are calling matrix cables, but you need to make sure that the cables connecting the switches and hubs are cross-over cables or that the cascade ports are switched for crossover. Paul
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  • Bigshybear
    The 3Com 3300 series has a short stacking cable that fits a funky connector on the back of each switch, this is the matrix cable. Three models of 3300 series have one connector in the back (two with fiber connectors in the front, and one without), and one model has multiple connectors (3300MM?)to gang multiple switches together. Once you connect two switches with the matrix cable, they are supposed to look like one switch to the network. The ganged switches are a single hop in the ethernet 3 hop rule. I think you have a different problem here. Even without an IP address assigned to the switch stack once you patch two computers in and assign IP addresses to them (either manually or via DHCP) they should be able to ping each other. The IP address for the switch stack is so you can use a browser to look at statistics from the switch, like how many packets it is passing to each port, which ports on the switch have commputers plugged in and powered up,etc, etc,etc. With what XP is reporting my first guess would be that the cable between the 3com stack and the rest of the network is not correct. It may need to be a cross over cable. Get the the 3Com quick guide for the 3300 http://support.3com.com/infodeli/tools/switches/ss3/3300/dqa1698-5aaa04.pdf and look at the LED's over that cable to see if it is connecting and passing data
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  • Rastafari
    Bigshybear you have saved the day! I wasn't aware you needed a crossover to link from 1 switch to another if not using Matrix cables. Now I can begin setting these things up and continue learning. Thanks a lot and to the others as well.
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  • Alan32
    Usually it's one ip address if they are to managed as one. Many vendors allow stacking with the members belonging to a cluster for management purposes. You can however, stack them and have different ip addresses. I believe your goal here is to have 4 switches appearing as one big switch so one ip will do as long as you configure them that way i.e., cluster or whatever 3Com calls it.
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