Dell PowerSwitch S4112F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 601
Changing OSPFv2 BFD session parameters, Disabling BFD for OSPFv2, INTERFACE CONFIGURATION Mode
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6. Establish BFD session with OSPFv2 neighbors in a single OSPF interface in a non-default VRF instance. ip ospf bfd all-neoghbors VRF CONFIGURATION Mode 7. Enter ROUTER-OSPF mode in a non-default VRF instance. router ospf ospf-instance vrf vrf-name 8. Establish BFD sessions with all OSPFv2 instances in a non-default VRF. bfd all-neighbors OS10# show running-configuration ospf ! interface vlan200 no shutdown ip vrf forwarding red ip address 20.1.1.1/24 ip ospf 200 area 0.0.0.0 ip ospf bfd all-neighbors disable ! interface vlan300 no shutdown ip vrf forwarding red ip address 30.1.1.1/24 ip ospf 200 area 0.0.0.0 ! router ospf 200 vrf red bfd all-neighbors log-adjacency-changes router-id 2.3.3.1 ! In this example OSPF is enabled in non-default VRF red. BFD is enabled globally at the router OSPF level and all the interfaces associated with this VRF OSPF instance inherit the global BFD configuration. However, this global BFD configuration does not apply to interfaces in which the interface level BFD configuration is already present. Also, VLAN 200 takes the interface level BFD configuration as interface-level BFD configuration takes precedent over the global OSPF-level BFD configuration. Changing OSPFv2 BFD session parameters Configure BFD sessions with default intervals and a default role. The parameters that you can configure are: desired tx interval, required min rx interval, detection multiplier, and system role. Configure these parameters for all OSPF sessions or all OSPF sessions on a particular interface. If you change a parameter globally, the change affects all OSPF neighbors sessions. If you change a parameter at the interface level, the change affects all OSPF sessions on that interface. NOTE: By default, OSPF uses the following BFD parameters for it's neighbors: min_tx = 200 msec, min_rx = 200 msec, multiplier = 3, role = active. If BFD is configured under interface context, that will be given high priority. To change parameters for all OSPFv2 sessions or for OSPF sessions on a single interface, use the following commands: 1. Change parameters for OSPF sessions. bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role [active | passive] ROUTER-OSPF Mode 2. Change parameters for all OSPF sessions on an interface. ip ospf bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role [active | passive] INTERFACE CONFIGURATION Mode Disabling BFD for OSPFv2 If you disable BFD globally, all sessions are torn down and sessions on the remote system are placed in a Down state. If you disable BFD on an interface, sessions on the interface are torn down and sessions on the remote system are placed in a Down Layer 3 601
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