Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 908)

878 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
RPF configuration
22
RPF configuration
Before you begin to configure Reverse Path Forwarding (RPF), review the following sections:
• “Configuration considerations for RPF”
• “Special considerations for configuring RPF on Brocade NetIron CES and Brocade NetIron CER
devices”
• “Special considerations for configuring RPF with ECMP routes”
• “RPF support for IP over MPLS routes”
• “RPF-compatible CAM profiles”
• “Configuring the global RPF command”
• “Enabling RPF on individual ports”
• “Configuring a timer interval for IPv6 session logging”
• “Suppressing RPF for packets with specified address prefixes”
Configuration considerations for RPF
Consider the following points when you configure Reverse Path Forwarding:
• IP packets with a source IP address of 0.0.0.0 will always fail RPF check.
• If you attempt to enable the global RPF command on a system with incompatible CAM settings,
the command will be rejected and you will receive a console message.
• Because the RPF feature requires that the entire IP route table is available in hardware, the
feature must work in conjunction with Foundry Direct Routing (FDR). FDR is the default mode
of operation for the device.
• You cannot configure RPF on a physical port that has VRF configured on it, or if the physical
port belongs to a virtual interface with a VRF configuration.
• Only RPF loose mode is supported for GRE routes.
• If a default route is present on the router, loose mode will permit all traffic.
• RPF can only be configured at the physical port level. It should not be configured on virtual
interfaces on the Brocade MLX series and Brocade NetIron XMR.
• Brocade NetIron CER and Brocade NetIron CES devices provide support for uRPF for VE
interfaces.
• IPv6 packets with a link-local source address are not subject to IPv6 RPF check.
• IPv6 RPF check is not supported for 6-to-4 tunnel routes.
Special considerations for configuring RPF
on Brocade NetIron CES and Brocade NetIron CER devices
• Brocade NetIron CES and Brocade NetIron CER devices do not support IPv6.
• Unlike the Brocade NetIron XMR and MLX devices, port level granularity is not supported on
Brocade NetIron CES and Brocade NetIron CER devices; therefore, RPF must be configured on
the entire device either all in loose mode or all in strict mode.
• If the logging feature is enabled, it is enabled on the entire device. If the logging feature is
disabled, logging for the entire device is disabled.