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Is it this simple or am I missing something? VLAN's on 3448 switch
I am adding a 3448 switch to my lan. I currently have a 3448, a 3448P and a 5324.
The 5324 is on VLAN 1 and all of our servers and such connect here. Ports 23 and 24 link to g3 on each the 3448 and the 3448p, which are configured on VLAN 1.
The 3448 lives completely on VLAN 1 for our internal LAN, while the 3448p is on VLAN 2 and is for our phones, which are handled by a third party VOIP provider.
I am looking to add another 3448 to the system and have configured ports 1-24 on VLAN 1 and ports 25-48 on VLAN 2. I have configured g3 on VLAN 1 and g4 on VLAN 2. I then linked g3 to g4 on the other 3448 on VLAN 1 and g4 to g4 on the 3448p, which on on VLAN 2.
The new switch works on VLAN 1 until I plug in the link to VLAN 2. Then I can no longer access the switch via IP and my PC loses connection. I am not a switch expert and all of this equipment and set up was inherited. Am I incorrect on how I am going about this or is there another setting I am missing?
Thanks,
John
bh1633
909 Posts
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March 24th, 2009 14:00
You have a spanning tree loop. The switches all default to a single spanning tree, so even though you do not have a networking loop because you have separate vlans, spanning tree blocks ports to remove the wiring loop (it does not pay attention to the vlans).
How to fix this? On the new 3448, turn of spanning tree on ports g3 and g4. Here is an example:
interface range ethernet g(3-4)
spanning-tree disable
exit