3 VLANs - How to connect a switch to the core properly

[stevenriz]

Hi there. We have a core with 2 VLANs configured. We also have a separate switch with 3 VLANs configured that we'd like to connect to a port on the core.

core VLANs = 1-Default  2-Voice  200-Barco

new switch VLANS = 1-Default  2-Voice  3-VoiceNY

All ports are tagged on the new switch like so...

vlan 1
name "Default"
no untagged 1-30
untagged 31-48
ip address 192.168.2.20 255.255.252.0
exit
vlan 2
name "Voice"
untagged 1-20
ip address 192.168.3.6 255.255.255.0
exit
vlan 3
name "VoiceNY"
untagged 21-30
ip address 192.168.4.7 255.255.255.0
exit

Do I need to untag the port on the new switch that we plan to use for the uplink/downlink from the core to the switch? And do the same on the core, remove the tag the port connecting to the new switch?

right now when I plug it in, the port we plug in immediately disables itself on the core. 

thanks

[Vince-Whirlwind]

We would need the old switch config to see what subnets are on those VLANs on the old switch.

Are you intending on both switches routing within their subnets?