Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

Configuring BFD for BGP multiple hop by using IPv4 addressing

Consider a scenario in which you have three systems, R1, R2, and R3. R1 and R3 share a BGP session. The following list provides the addresses of R1, R2, and R3.
  • R1 loopback address—1.1.1.1
  • R1 interface address facing R2—10.10.10.1
  • R2 loopback address—2.2.2.2
  • R2 interface address facing R1—10.10.10.2
  • R2 interface address facing R3—20.20.20.2
  • R3 interface address facing R2—20.20.20.3
  • R3 loopback address—3.3.3.3
Figure 1. Configuring BFD for BGP multiple hop by using IPv4 addressing

To configure a multiple-hop BFD session between R1 and R3, perform the following steps in configuration mode.

Table 1. Configuring BFD for BGP Multiple Hop by Using IPv4 Addressing
Router Step Command
R1 Create a BFD template called test. See section Configuring the BFD template.
R1 Associate the BFD test template with the destination address of R3 and the source address of R1.
vyatta@R1# set protocols bfd destination 20.20.20.3 source 10.10.10.1 template test
R1 Register R3 as a BFD neighbor.
vyatta@R1# set protocols bgp 100 neighbor 20.20.20.3 fall-over bfd
R1 Commit the configuration.
vyatta@R1# commit
R1 Save the configuration.
vyatta@R1# save
R1 Display the configuration.
vyatta@R1# show protocols bgp
bgp 100 {
        neighbor 20.20.20.3 {
                fall-over {
                        bfd
                }
                remote-as 100
        }
 }
vyatta@R1# show protocols bfd 
 bfd {
        destination 20.20.20.3 {
                source 10.10.10.1 {
                        template test
                }
        }
        template test {
                auth {
                        simple {
                                key "********"
                        }
                }
                        minimum-rx 300
                        minimum-tx 300
                        multiplier 3
        }
 }

R3 Create a BFD template called test. See section Configuring the BFD template.
R3 Associate the BFD test template with the destination address of R1 and the source address of R3.
vyatta@R3# set protocols bfd destination 10.10.10.1 source 20.20.20.3 template test
R3 Register R1 as a BFD neighbor.
vyatta@R3# set protocols bgp 100 neighbor 10.10.10.1 fall-over bfd
R3 Commit the configuration.
vyatta@R3# commit
R3 Save the configuration.
vyatta@R3# save
R3 Display the configuration.
vyatta@R3# show protocols bgp
bgp 100 {
        neighbor 10.10.10.1 {
                fall-over {
                        bfd
                }
                remote-as 100
        }
 }

vyatta@R3# show protocols bfd 
 bfd {
        destination 10.10.10.1 {
                source 20.20.20.3 {
                        template test
                }
        }
        template test {
                auth {
                        simple {
                                key "********"
                        }
                }
                        minimum-rx 300
                        minimum-tx 300
                        multiplier 3
        }
 }