Vyatta Network OS Documentation

Learn how to install, configure and operate the Vyatta NOS, which helps drive our virtual networking & physical platforms portfolio.

DHCP classless static routes

By default, the vRouter enables classless static routes through DHCP using option 121. For more information about classless static routes and option 121, refer to RFC 3442 at https://tools/ietf.org/html/rfc3442.

DHCP packets from the vRouter include the classless static option in the parameter request list. When replies from a DHCP server include this option, the default router (option 3) route is ignored per the RFC. Classless static routes may include a default route that is installed similar to other option 121 routes.

Note: The classless static route option is only available on the vRouter IPv4 DHCP client. A vRouter DHCP server does not support the classless static routes option.

For the occasion when you must disable the classless static route option on the vRouter DHCP client, use the following commands

  • interfaces bridge <brx> dhcp-options no-rfc3442—Disables support for the DHCP classless static route option for a bridge group.
  • interfaces dataplane interface-name dhcp-options no-rfc3442—Disables support for the classless static route option for DHCP on a data plane interface.
  • interfaces dataplane interface-name vif vif-id dhcp-options no-rfc3442—Disables support for the classless static route option for DHCP on a virtual interface.

For information on data plane and virtual interfaces, refer to Ciena Vyatta Network OS LAN Interfaces Configuration Guide.

Note: Before using these commands, configure the respective bridge or data plane address for the DHCP client.