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Dynamic Host Configuration Protocol

  • Support for Q-in-Q tunneling with L2 swap-push/pop-swap configuration and DHCP security (EX2300, EX4100, EX3400, EX4300-MP, EX4400, and EX4400-MP)—Starting in Junos OS Release 23.4R1, you can configure Q-in-Q tunneling with L2 swap-push/pop-swap in which the customer VLAN (C-VLAN) tag is swapped with the inner-vlan-id tag, and the service-provider-defined service VLAN (S-VLAN) tag is pushed on it (for traffic flowing from customer to service provider site). For the traffic flowing from the service provider network to the customer network, we've removed the S-VLAN tag, and replaced the C-VLAN tag with the VLAN ID configured on the UNI logical interface. To support DHCP security along with Q-in-Q tunneling, you can configure the following DHCP security features:

    • DHCP snooping (DHCPv4 and DHCPv6)
    • Dynamic ARP inspection
    • Neighbor discovery inspection
    • IP source guard
    • DHCP option 82 and DHCPv6 option 37

    [See DHCP Security in Q-in-Q with Service Provider Configuration.]