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DHCP Option-82 Customization with EVPN/SR E-LAN/E-Tree

The DHCPv4 Option-82 customization feature, in conjunction with EVPN/SR E-LAN and E-Tree support, offers precise control over DHCP relay agent information by allowing you to configure custom hexadecimal or ASCII values for the circuit ID and remote ID. This capability ensures more granular policy enforcement based on detailed client data. Additionally, you can leverage enhanced visibility and management with the inclusion of physical interface details in the "show dhcp relay binding" command output. The system also supports the customization of DHCPv6 options, facilitating custom values for relay-agent-interface-id and relay-agent-remote-id. Furthermore, integrating Option-82 values into RADIUS VSA improves compatibility with non-standard authentication methods, while the unhidden NAK options provide feedback on unknown renew or rebind requests, enhancing client management. These features collectively bolster the flexibility, control, and serviceability of your network environment.

Benefits of DHCPv4 Option-82 Customization with EVPN/SR E-LAN/E-Tree Support

  • Provides granular policy enforcement by allowing the configuration of custom hexadecimal or ASCII values for circuit ID and remote ID, ensuring more precise control over client data.

  • Enhances network visibility and management by displaying the physical interface associated with each subscriber in the "show dhcp relay binding" command output, aiding in troubleshooting and network administration.

  • Improves integration with non-standard authentication methods by including Option-82 values in RADIUS VSA, facilitating compatibility and flexibility in authentication processes.

  • Supports customized DHCPv6 relay-agent options, enabling tailored configurations for relay-agent-interface-id and relay-agent-remote-id, which can improve network deployment for DHCPv6 environments.

  • Provides better client management with the capability of sending DHCPNAKs for unknown rebind or renew requests, ensuring that unauthorized or misconfigured devices are promptly identified and addressed.

Overview

The DHCPv4 Option-82 customization feature with EVPN/SR E-LAN/E-Tree support allows you to define custom circuit ID and remote ID values in either ASCII or hexadecimal formats. This capability enhances your network management by providing more granular control over the information relayed to the DHCP server. By configuring these custom values, you can enforce specific policies based on detailed client data, which can be crucial in complex network environments where precise client identification is necessary.

To configure custom circuit ID and remote ID values, you can use the following CLI commands:

set forwarding-options dhcp-relay relay-option-82 circuit-id user-defined string <ascii-string> set forwarding-options dhcp-relay relay-option-82 circuit-id user-defined hex-string <hexadecimal-string> set forwarding-options dhcp-relay relay-option-82 remote-id user-defined string <ascii-string> set forwarding-options dhcp-relay relay-option-82 remote-id user-defined hex-string <hexadecimal-string>

These commands allow you to specify custom strings that replace the default circuit ID and remote ID values, thus tailoring the information passed to the DHCP server for more accurate policy application and client tracking.

Additionally, this feature supports DHCPv6 environments by extending similar customization capabilities to the relay-agent-interface-id (Option 18) and relay-agent-remote-id (Option 37). You can configure these options using the following commands:

set forwarding-options dhcp-relay dhcpv6 relay-agent-interface-id user-defined string <ascii-string> set forwarding-options dhcp-relay dhcpv6 relay-agent-interface-id user-defined hex-string <hexadecimal-string> set forwarding-options dhcp-relay dhcpv6 relay-agent-remote-id user-defined string <ascii-string> set forwarding-options dhcp-relay dhcpv6 relay-agent-remote-id user-defined hex-string <hexadecimal-string>

By utilizing these commands, you can ensure that custom relay agent information is accurately included in DHCPv6 messages, thus providing consistent policy enforcement and client management across both DHCPv4 and DHCPv6 protocols.

Trace Options for DHCP

To facilitate detailed debugging and logging of DHCP processes, you can enable trace options. This capability helps in diagnosing and resolving network issues effectively by providing comprehensive logs of DHCP activities. Use the following configuration to set up trace options:

system { processes { dhcp-service { traceoptions { file jdhcpd size 1g; level all; flag all; } } } }

By configuring these trace options, you gain visibility into the DHCP server's operations, allowing you to monitor and troubleshoot DHCP-related events with detailed logs. This improved serviceability ensures that network administrators can quickly identify and address issues, thereby maintaining the overall health and performance of the network.