Reference Guide

4. The passive system receives the control packet and changes its state to Up. Both systems agree that a session is
established. However, because both members must send a control packet, which requires a response, whenever there is
a state change or change in a session parameter, the passive system sends a final response indicating the state change.
After this, periodic control packets are exchanged.
BFD configuration
Before you configure BFD for a routing protocol, first enable BFD globally on both routers in the link. BFD is disabled by default.
● OS10 supports:
○ 64 BFD sessions at 100 minimum transmit and receive intervals with a multiplier of 4
○ 100 BFD sessions at 200 minimum transmit and receive intervals with a multiplier of 3
● OS10 does not support Demand mode, authentication, and the Echo function.
● OS10 does not support BFD on multi-hop and virtual links.
● OS10 supports protocol liveness only for routing protocols.
● OS10 BFD supports only the BGP routing protocol. For IPv4 and IPv6 BGP, OS10 supports only the default VRF.
Configure BFD globally
Before you configure BFD for static routing or a routing protocol, configure BFD globally on each router, including the global
BFD session settings. BFD is disabled by default.
1. Configure the global BFD session parameters in CONFIGURATION mode.
bfd 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.
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