3com Baseline inter-switch vlan database

Posted on 2011-10-19
Last Modified: 2012-05-12
3 - 3com BaseLine 2952-SFP Plus

Setup - We have 3 Baseline 2952 switches.  All switches are connected to each other via ports 47 and 48 which are configured as TRUNK ports.

Most of our equipment resides on the default VLAN1.  We have configured a new VLAN (5) and made ports 20-22 on switch 1 access ports on vlan 5.  This works fine, equipment plugged into those ports can talk to each other with no problem.  The problem is trying use port 8 on switch 2 in vlan 5.  If I make that port an access port on VLAN5, the computer cannot communicate with objects on switch 1 ports 20-22.

I do not have these switches in stacking mode, as I thought the trunk ports should allow sharing of the VLAN databases based on dot1q.

My question is, do I need to enable stacking and make ports 47 and 48 stack ports to share the vlan database?

NOTE: I am not trying to route between vlans.  Simply share vlans across switches

Question by:thecureis
    LVL 10

    Accepted Solution

    Sounds like you may need to add vlan 5 to your trunk ports. Have you done this already?
    LVL 10

    Expert Comment

    I will add a couple things to my first post.

    Without stacking, the switches do not "Share" anything. You need to create all the vlans on both switches and then add the VLANs you wish to share between switches to your trunk ports. I would recomend using only only one trunk port to start with as aggregating ports can add a whole other level of complexity. Once you get your VLAN trunking working between switches then you can mess around with aggregating ports.
    LVL 3

    Author Comment

    I have not added vlan5 to the trunk. Do I simply tag vlan5 on those ports?
    LVL 3

    Author Closing Comment

    I knew it was something dumb that I was missing.

    I modified the trunk ports (47/48) to tag VLAN5 and all is working now.


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