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R1# sh bfd neighbors
Neighbor Discriminator State Interface
--------------------------------------- ------------- --------- ----------------
198.51.100.2 2907010617 Up gi1/0/1
R1# sh bfd neighbors 198.51.100.2
Neighbor address: 198.51.100.2
Local address: 198.51.100.1
Interface: gi1/0/1
Remote discriminator: 2907010617
Local discriminator: 2856477782
State: Up <--- состояние протокола
Session type: Control
Session mode: Single-hop
Local diagnostic code: No Diagnostic
Remote diagnostic code: No Diagnostic
Minimal Tx Interval: 300 ms
Minimal Rx Interval: 300 ms
Multiplier: 5
Actual Tx Interval: 300 ms
Actual Detection Interval: 1500 ms
Number of transmitted packets: 1444
Number of received packets: 1402
Uptime (d,h:m:s): 00,00:03:39
Client: STATIC <---- сервис, который отслеживает изменение состояния
R1# sh ip route 192.0.2.0/24
Codes: C - connected, S - static, R - RIP derived,
O - OSPF derived, IA - OSPF inter area route,
E1 - OSPF external type 1 route, E2 - OSPF external type 2 route
B - BGP derived, D - DHCP derived, K - kernel route, V - VRRP route
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
H - NHRP, * - FIB route
S * 192.0.2.0/24 [1/0] via 198.51.100.2 on gi1/0/1 [static 16:22:27]
R1# sh bfd neighbors
Neighbor Discriminator State Interface
--------------------------------------- ------------- --------- ----------------
198.51.100.2 2907010617 Up gi1/0/1
R1# sh ip route 192.0.2.0/24
Codes: C - connected, S - static, R - RIP derived,
O - OSPF derived, IA - OSPF inter area route,
E1 - OSPF external type 1 route, E2 - OSPF external type 2 route
B - BGP derived, D - DHCP derived, K - kernel route, V - VRRP route
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
H - NHRP, * - FIB route
S * 192.0.2.0/24 [1/0] via 198.51.100.2 on gi1/0/1 [static 16:22:27] <---- маршрут присутствует в FIB
// После того как BFD-сессия разрушилась, отслеживаемый маршрут удалился из FIB:
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Настройка политики маршрутизации PBR
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