in addition to Balaji's post, if you want to use VLAN 20 as the management VLAN, you will need to user the 'interface vlan 20' command and assign the management IP address to that Vlan. Keep in mind that the 2950 is not a layer 3 switch, which means that you cannot create more than one VLAN with an ip address on it.
Also, you might want to check if your existing switches are part of a VTP domain. You can check this on any of the existing switches with the command 'show vtp status'. If you see a VTP domain name in the output, configure that name (case-sensitive) on the new 2950 switch as well:
2950(config)#vtp domain xxxx
If the management Vlan (20) already exists in your network, chances are that you do not even have to configure it locally, provided your new 2950 switch is configured with the VTP domain name, as described above, and in VTP client mode:
A VTP client gets all the Vlan information from the VTP server...
I appreciate your help i did this configuration i create a vlan 20 then assign an ip add.i configured each fastethernet to switchport mode access and switchport access vlan 20 . how about the gigaethernet 0/1 and 0/2 should i configured to vlan 20?
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