Configuring BFD Configuring BFD
page 30-20 OmniSwitch AOS Release 6 Network Configuration Guide September 2009
The above command establishes a BFD session on interface named int1 with OSPF DR neighbors in full
state only. To establish a BFD session on an interface with all neighbors which are greater than or equal to
“2-way” state, use the ip ospf interface bfd-std all-nbrs command as shown below:
-> ip ospf interface int2 bfd-std all-nbrs
The above command establishes a BFD session on interface named int2 with all OSPF neighbors that are
greater than or equal to “2-way” state.
Note. By default, BFD session is enabled on an interface with all neighbors which are greater than or
equal to “2-way” state.
When any neighbors are added to this interface, OSPF informs BFD about the newly added neighbor(s);
BFD then establishes a session with them. Use the show ip bfd-std sessions command to view BFD
sessions with all BFD neighbors, as shown below:
-> show ip bfd-std sessions
Neighbor Interface Local Remote Negotiated Negotiated Echo Rx
IP Address Address State Disc Disc Tx Rx
-----------+------------+-------+------+------+------------+----------+---------
25.25.25.1 25.25.25.25 UP 45 53 100 100 200
26.26.26.63 26.26.26.36 INIT 43 21 200 200 200
To view a BFD session with a particular neighbor, use the show ip bfd-std session command followed by
the local session discriminator. For example:
-> show ip bfd-std session 45
Interface address : 10.172.18.16,
Neighbor address : 10.172.18.17,
State: UP,
Local discriminator : 45,
Remote discriminator : 53,
Protocol: OSPF,
Negotiated Tx interval: 100,
Negotiated Rx interval: 100,
Echo Rx interval : 200,
Multiplier : 3,
Tx packet counter : 4321,
Rx packet counter : 4675,
Protocol enabled : OSPF
Whenever there is any change to the interface/neighbor list or interface/neighbor state, OSPF immediately
informs BFD about the changes. Additionally, whenever BFD detects any changes to the other end, BFD
updates its database accordingly and informs OSPF for its fastest convergence.
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