Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Configuring VLans on 3COM 4500 Switches

Configuring VLans on 3COM 4500 Switches

Configuring VLans on 3COM 4500 Switches

I have four 3COM 4500 switches and would like to create four VLANs -,,,  Switches A ( and B ( are 48 port switches installed in MDF1, switch C ( is in IDF1, and Switch D ( is in IDF2.  

What is the best way to set these up so all VLANs can talk to each other?  

How do I configure UDP helper for DHCP, DNS, and WINS to work on all VLANs?  

And finally, For the routing, should I set the default route in switch A to be my internet router (, and the default route in switches B, C, and D to be the IP address of Switch A (

I prefer using the web interface but help configuring in the web UI or CLI will be greatly appreciated.

RE: Configuring VLans on 3COM 4500 Switches

Quote (DZuroff):

What is the best way to set these up so all VLANs can talk to each other?

Physically or logically?

Physically, use the stacking ports.  Then, if you like, you can manage the entire stack with one IP, especially switches A and B.

Logically, you need IP interfaces defined for each VLAN.  That interface will be the routing point for that VLAN.  Any devices in a VLAN must use the corresponding VLAN's IP interface as the default gateway.  DHCP helpers need to be defined on each switch and associated with the VLAN(S).  Your DHCP server should be able to hand out the DNS and WINS settings for you, once you give it the right information.  For WINS you want hybrid mode.

And then comes route management.  Look into RIP for simplicity.  Or, static routes. sad

Sounds like this is new territory for you.

I don't frequent these areas like I used to but post the right questions and answers will flow.

RE: Configuring VLans on 3COM 4500 Switches

Use one of the four switches to act as your "routing switch"
Make sure that every VLAN interface has an IP address on the routing switch.
Add an IP Route for every VLAN of the other switch to the "routing switch". On the routing switch you need an IP route to you internet gateway.

If you have VoIP, then you mostly can set port to hybrid and put default VLAN of that port to the VLAN you want and for VoIP you can put it on another VLAN but then tagged.


It works! Now if only I could remember what I did...

Dain Bramaged

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close