SX550 DHCP Relay problem

[alberx]

I'm having problems in DHCP relay with SX550. I followed this guide:

https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-small-business-300-series-managed-switches/smb5567-configure-dynamic-host-configuration-protocol-dhcp-relay-set.html

But still devices connected to a VLAN don't get IP address from the DHCP server, I made a traffic capture in the uplink of the SX550 and no DHCP request is shown. If I change the interface vlan to a C4500 devices have no problems getting IP.

Does anyone experienced simmilar issue??

Thanks.

[balaji.bandi]

can you post the configuration and confirm do you have reachability to DHCP Server IP address from Switch - where you are not able to get DHCP Lease?

How is you SX connected to C4500 ?

[alberx]

Hi Balaji,

attached config and ping from vlan 90 to dhcp server. C4500 is connected to SX550 through a trunk link with all the vlans (TengigabitEthernet1/0/21). We detected the problem in vlan 90.

Thanks.