配置：

[SR88X-down]track 1 bfd static abc

bfd static abc peer-ip 2.2.2.2 interface

GigabitEthernet3/3/2 source-ip 2.2.2.1 discriminator local 4321 remote 1234

bfd

min-transmit-interval 10

bfd

min-receive-interval 10

bfd

detect-multiplier 3

[SR88X-up] track 1 bfd static abc

[SR88X-up] bfd static abc peer-ip 2.2.2.1

interface GigabitEthernet4/1/4 source-ip 2.2.2.2 discriminator local 1234

remote 4321

bfd

min-transmit-interval 10

bfd

min-receive-interval 10

bfd

detect-multiplier 3

[SR88X-up]display track all

Track ID: 1

State: Positive

Duration: 0 days 0 hours 5 minutes 56 seconds

Tracked object type: BFD static

Notification delay: Positive 0, Negative 0 (in seconds)

Tracked object:

BFD static session name: abc

[SR88X-up]display ip routing-table 5.5.5.5

Summary count : 1

Destination/Mask   Proto   Pre Cost        NextHop         Interface

5.5.5.5/32         Static  60  0           2.2.2.1         GE4/1/4

验证过程：

[SR88X-up-GigabitEthernet4/1/4]shut

[SR88X-up-GigabitEthernet4/1/4]%Jul 18 07:38:05:574 2019 SR88X-up BFD/5/BFD_CHANGE_FSM: -MDC=1; Sess[2.2.2.2/2.2.2.1, LD/RD:1234/4321, Interface:GE4/1/4, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 (Control Detection Time Expired)

[SR88X-up]display track all

Track ID: 1

State: Negative

Duration: 0 days 0 hours 0 minutes 18 seconds

Tracked object type: BFD static

Notification delay: Positive 0, Negative 0 (in seconds)

Tracked object:

BFD static session name: abc

[SR88X-up]display ip routing-table 5.5.5.5

Summary count : 1

Destination/Mask   Proto   Pre Cost        NextHop         Interface

5.5.5.5/32         Static  80  0           1.1.1.2         GE4/1/1

[SR88X-up]ping 5.5.5.5

Ping 5.5.5.5 (5.5.5.5): 56 data bytes, press CTRL_C to break

56 bytes from 5.5.5.5: icmp_seq=0 ttl=254 time=9.498 ms

56 bytes from 5.5.5.5: icmp_seq=1 ttl=254 time=2.469 ms

56 bytes from 5.5.5.5: icmp_seq=2 ttl=254 time=2.172 ms

56 bytes from 5.5.5.5: icmp_seq=3 ttl=254 time=2.086 ms

56 bytes from 5.5.5.5: icmp_seq=4 ttl=254 time=2.180 ms

[SR88X-up]int g 4/1/4

[SR88X-up-GigabitEthernet4/1/4]undo shut

%Jul 18 07:44:41:600 2019 SR88X-up BFD/5/BFD_CHANGE_FSM: -MDC=1; Sess[2.2.2.2/2.2.2.1, LD/RD:1234/4321, Interface:GE4/1/4, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->UP, Diag: 0 (No Diagnostic)

[SR88X-up]display ip routing-table 5.5.5.5

Destination/Mask   Proto   Pre Cost        NextHop         Interface

5.5.5.5/32         Static  60  0           2.2.2.1         GE4/1/4

[SR88X-up]display track all

Track ID: 1

State: Positive

Duration: 0 days 0 hours 0 minutes 25 seconds

Tracked object type: BFD static

Notification delay: Positive 0, Negative 0 (in seconds)

Tracked object:

BFD static session name: abc

[SR88X-up]ping 5.5.5.5

Ping 5.5.5.5 (5.5.5.5): 56 data bytes, press CTRL_C to break

56 bytes from 5.5.5.5: icmp_seq=0 ttl=255 time=1.012 ms

56 bytes from 5.5.5.5: icmp_seq=1 ttl=255 time=0.646 ms

56 bytes from 5.5.5.5: icmp_seq=2 ttl=255 time=0.621 ms

56 bytes from 5.5.5.5: icmp_seq=3 ttl=255 time=1.021 ms

56 bytes from 5.5.5.5: icmp_seq=4 ttl=255 time=0.656 ms