Dell PowerSwitch S5212F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 597

OS10(conf-router-bgp-2)# bfd all-neighbors interval 200 min_rx 200 multiplier 6 role active BFD packets originating from a router are assigned to the highest priority egress queue to minimize transmission delays. Incoming BFD control packets received from the BGP neighbor are assigned to the highest priority queue within the control plane policing (CoPP) framework to avoid BFD packets drops due to queue congestion. BFD notifies BGP of any failure conditions that it detects on the link. BGP initiates recovery actions. BFD for BGP is supported only on directly connected BGP neighbors and in both BGP IPv4 and IPV6 networks. A maximum of 100 simultaneous BFD sessions are supported. If each BFD for BGP neighbor receives a BFD control packet within the configured BFD interval for failure detection, the BFD session remains up and BGP maintains its adjacencies. If a BFD for BGP neighbor does not receive a control packet within the detection interval, the router informs any clients of the BFD session, and other routing protocols, about the failure. It then depends on the routing protocol that uses the BGP link to determine the appropriate response to the failure condition. The normal response is to terminate the peering session for the routing protocol and reconverge by bypassing the failed neighboring router. A log message generates whenever BFD detects a failure condition. Configure BFD for BGP OS10 supports BFD sessions with IPv4 or IPv6 BGP neighbors using the default VRF. When you configure BFD for BGP, you can enable BFD sessions with all BGP neighbors discovered by BGP or with a specified neighbor. 1. Configure BFD session parameters and enable BFD globally on all interfaces in CONFIGURATION mode as described in Configure BFD globally. bfd interval milliseconds min_rx milliseconds multiplier number role {active | passive} bfd enable 2. Enter the AS number of a remote BFD peer in CONFIGURATION mode, from 1 to 65535 for a 2-byte AS number and from 1 to 4294967295 for a 4-byte AS number. Only one AS number is supported per system. If you enter a 4-byte AS number, 4byte AS support enables automatically. router bgp as-number 3. Enter the IP address of a BFD peer in ROUTER-BGP mode. Enable a BFD session and the BGP link in ROUTER-NEIGHBOR mode. The global BFD session parameters configured in Step 1 are used. neighbor ip-address bfd no shutdown OR Configure BFD sessions with all neighbors discovered by the BGP in ROUTER-BGP mode. The BFD session parameters you configure override the global session parameters configured in Step 1. bfd all-neighbors [interval milliseconds min_rx milliseconds multiplier number role {active | passive}] ● interval milliseconds - Enter the time interval for sending control packets to BFD peers, from 100 to 1000; default 200. Dell EMC recommends using more than 100 milliseconds. ● min_rx milliseconds - Enter the maximum waiting time for receiving control packets from BFD peers, from 100 to 1000; default 200. Dell EMC recommends using more than 100 milliseconds. ● multiplier number - Enter the maximum number of consecutive packets that are not received from a BFD peer before the session state changes to Down, from 3 to 50; default 3. ● role {active | passive} - Enter active if the router initiates BFD sessions. Both BFD peers can be active at the same time. Enter passive if the router does not initiate BFD sessions, and only responds to a request from an active BFD to initialize a session. The default is active. To ignore the configured bfd all-neighbors settings for a specified neighbor, enter the bfd disable command in ROUTER-NEIGHBOR mode. OR Layer 3 597