Topology:

DHCP Client >> Switch >> SRX (MIST Managed)

DHCP Clients are not receiving IPs for a specific or all VLANs

Isolate the issue and take required/appropriate action:

• Check the running config and make sure the DHCP Config is generated and pushed to the SRX, which is the DHCP Server.

set groups top access address-assignment pool AP_mgmt family inet network X.X.X.0/24

set groups top access address-assignment pool AP_mgmt family inet range AP_mgmt low X.X.X.10

set groups top access address-assignment pool AP_mgmt family inet range AP_mgmt high X.X.X.199

set groups top access address-assignment pool AP_mgmt family inet dhcp-attributes name-server 8.8.8.8

set groups top access address-assignment pool AP_mgmt family inet dhcp-attributes router X.X.X.1

set groups top access address-assignment pool AP_mgmt family inet dhcp-attributes maximum-lease-time 3600

• If the config is present, the next step is to identify the Interface facing the Switch that is expected/configured to receive the DHCP BOOTP Packets.
• Run CLI command> monitor traffic interface reth4.0 no-resolve matching "port 68 or port 67"
• Restart the Client and check whether the DHCP DISCOVER Broadcast Packets are received on the SRX Interface.
• Validate that the VLAN Tagging is correct.
• If no packets are received or the VLAN Tagging is wrong, correct it on the Switch Side and check again.

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