Adding a 3750 Switch to an existing Vlan Network

Unanswered Question
Aug 21st, 2007

I am about to add a new (4) 3750 switch to an existing Vlan network.

I am a bit confused on what to do as regards the configuration.

Could anyone give me some guidelines?



I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Jagdeep Gambhir Wed, 08/22/2007 - 06:51


YOu need to assign each switch with IP address and then make all ports a part of vlan you want.

I'm assuing you have only one vlan.

AAA-Switch#confi t

Enter configuration commands, one per line. End with CNTL/Z.

AAA-Switch(config)#interface vlan 1

AAA-Switch(config-if)#ip address

AAA-Switch(config)#interface range gigabitEthernet 1/0/1-24

AAA-Switch(config-if-range)#vlan 1

Hope that helps


ejiron21 Wed, 08/22/2007 - 10:47

Thanks JG,

Unfortunately,its got 5 Vlans configured already. So i need to add them to the 5 Vlan's?

Also they are stakable switches with the Master swith already active so its basically adding these 4 switches to the Existing network of 5 Switches.

Do i need to configue VTP and Vlan Client on all switches or will it automatically load as soon as its powered up when stacked?


Jagdeep Gambhir Wed, 08/22/2007 - 11:15


yes if it is VLAN 5 then you need put vlan 5. You can add new switches to the existing stack,

VTP configuration is the same in all members of a switch stack. When the switch stack is in VTP server or client mode, all switches in the stack carry the same VTP configuration. When VTP mode is transparent, the stack is not taking part in VTP.

?When a switch joins the stack, it inherits the VTP and VLAN properties of the stack master.

?All VTP updates are carried across the stack.

?When VTP mode is changed in a switch in the stack, the other switches in the stack also change VTP mode, and the switch VLAN database remains consistent



Please rate if helps


This Discussion