Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

5RPFBrocade# show loggingSyslog logging: enabled (0 messages dropped, 0 flushes, 1305 overruns)Buffer logging: level ACDMEINW, 50 messages loggedlevel code: A=alert C=critical D=debugging M=emergency E=errorI=informational N=notification W=warningDynamic Log Buffer (50 lines):May 11 12:12:54:I:RPF: Denied 1 packets on port 7/5 tcp 4.4.4.1(0) -> 5.6.7.8(0)NOTEA maximum of 256 RPF messages are logged per minute.Clearing RPF statisticsTo clear RPF statistics on a specific physical interface, use the following command.clear ip interface ethernetSyntax: clear ip interface ethernet RPF debug commandsThere are no debug commands specific to RPF.Configuration notes• IP packets with the source IP address of 0.0.0.0 will always fail the 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 be available in hardware, thefeature must work in conjunction with Foundry Direct Routing (FDR). FDR is the default modeof operation for the Brocade NetIron XMR series and Brocade MLX series routers.• You cannot configure RPF on a physical port that has VRF configured on it, or if the physicalport 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 must not be configured on virtualinterfaces.156 Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide53-1002426-02