Adding a basic managed switch to a Catalyst stack as if unmanaged

[EYoung1]

I have a Cisco SG300-28p switch (call it NEW SWITCH) that I want to add to a Catalyst switch (call it OLD SWITCH) so it can pass one specific VLAN 500 to all the ports and they can get internet access like any other port.

The problem is that NEW sees the VLANs I have allowed on the trunk port on OLD, but doesn’t seem to allow it to get any DHCP info or any other information. When I plug in a PC to one of the ports, it lights up but gets no DHCP information.

Here’s the current setup:

[ OLD SWITCH – CLI for config ]                                                                   [ NEW SWITCH – GUI config ]

                                                                                                                    Dhcp relay to dhcp server

[ 2/0/44 – switchport mode trunk / allowed vlan 500 ] < -------------- > [ 1/0/25 – switchport trunk ]

[ PC – DHCP autoconfig enabled ] < ------- >                                           [ 1/0/3 – set to Vlan 500 tagged ]

Cisco Gurus. Lend me your “config t’.

[balaji.bandi]

where is your DHCP Server, You need native vlan 

may be try adding on the trunk config (high level without looking config) - still issue post show run.

switchport trunk native vlan 500

[EYoung1]

DHCP server is on a different subnet that's accessible to all VLANs.

Do I make the trunk native on the NEW or OLD switch?

[balaji.bandi]

on NEW

[paul driver]

Hello

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@EYoung1 wrote:

I have a Cisco SG300-28p switch (call it NEW SWITCH) that I want to add to a Catalyst switch (call it OLD SWITCH) so it can pass one specific VLAN 500 to all the ports and they can get internet access like any other port.

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No need to trunk the interconnection between OLD and NEW just use a access port assigned to vlan 500 towards the switch that you want just vlan 500 to work on.