Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 160

Number of messages from IFA about port state change: 0 Number of messages communicated b/w Manager and Agent: 7 Disabling and Re-Enabling BFD BFD is enabled on all interfaces by default, though sessions are not created unless explicitly configured. If you disable BFD, all of the sessions on that interface are placed in an Administratively Down state ( the first message example), and the remote systems are notified of the session state change (the second message example). To disable and re-enable BFD on an interface, use the following commands. • Disable BFD on an interface. INTERFACE mode no bfd enable • Enable BFD on an interface. INTERFACE mode bfd enable If you disable BFD on a local interface, this message displays: R1(conf-if-gi-4/24)#01:00:52: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Ad Dn for neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0) If the remote system state changes due to the local state administration being down, this message displays: R2>01:32:53: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Down for neighbor 2.2.2.1 on interface Gi 2/1 (diag: 7) Configure BFD for Static Routes Configuring BFD for static routes is supported on , , S4820T, and. BFD offers systems a link state detection mechanism for static routes. With BFD, systems are notified to remove static routes from the routing table as soon as the link state change occurs, rather than waiting until packets fail to reach their next hop. Configuring BFD for static routes is a three-step process: 1. Enable BFD globally. 2. Configure static routes on both routers on the system (either local or remote). 3. Configure an IP route to connect BFD on the static routes using the ip route bfd command. Related Configuration Tasks • Changing Static Route Session Parameters • Disabling BFD for Static Routes 160 Bidirectional Forwarding Detection (BFD)