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Two switches A and B are connected through port 10. Switch A is connected to the DHCP server and it is found that both vlan10 and vlan15 on switch A can obtain IP addresses from the DHCP server. However, only vlan10 on switch B can obtain IP addresses, but VLAN15 cannot.
Please check the port VLAN settings on the switch. Please confirm that port10 on the switch has been added to VLAN 15 and that the forwarded message carries the VLAN tag.