Connecting multiple Cisco switches

Posted on 2012-08-22
Last Modified: 2012-09-14
I am trying to connect a second switch (Catalyst 2960-S) to an existing Catalyst 2960-G. The G belongs to a third party company that manages my IP phones; they have 2 different Vlans on the G switch. One of the vlans is for just data (Vlan 1), the other is for phones and data (Vlan 10). I am wanting to connect this switch on the Vlan that is both phones and data. How would I go about configuring this?
Question by:j_crow1
    LVL 6

    Accepted Solution

    Unless you can get them to configure a Q trunk, you will have to connect 2 ports.......One in each vlan to your switch and configure accordingly.

    On the 2960S the trunk interface will be configured with the command:

     switchport mode trunk

    If there are two isolated vlan connections it will look similar to the following:

    interface GigabitEthernet1/0/23
     switchport access vlan 8
     switchport mode access
    interface GigabitEthernet1/0/24
     switchport access vlan 18
     switchport mode access

    You will change the vlan id's and port designations as necessary.

    Author Comment

    I am just wanting to leave the default vlan 1 on the S switch, so I just configure the first port on the S switch with the vlan info for the G switch?

    For example I want to connect to the Vlan 10 on the G switch, so I need to use:
    switchport access vlan10
    on the S switch? Or does it matter what the vlan number is on the S switch?
    LVL 7

    Expert Comment

    Unless what you are doing is supported by the third party provider, I wouldn't attempt this.  I can think of at least a couple of features (Port security, spanning-tree BPDUGuard, STP vlan ID consistency) that may lock the port, resulting in you having to call the provider, or reset the switch.
    LVL 6

    Expert Comment

    Unfragmented has a point, but if you do proceed disable CDP on the new switch on any ports that connect to the existing switch. That will prevent ports being disabled due to vlan mismatch.

    Author Comment

    I will do it with their help...I am just unfamiliar with the switch commands.

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