问

BFD联动静态路由，为什么bfd状态不断切换？

2024-01-29提问

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zhiliao_lrTLxR

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问题描述：

A1\B1为主链路，A2\B2为备用链路。192.168.168.10和192.168.169.10 到10.10.10.1 有两条链路，中间防火墙为透明模式，策略全通状态。为什么建立好的BFD会话状态会不断的切换？默认配置BFD ，两端设备的Holdtime 时间为什么不一样？

<H3C>%Jan 29 09:59:24:542 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[21.1.1.2/21.1.1.1, LD/RD:33794/32833, Interface:GE1/0/8, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->INIT, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 09:59:24:543 2024 H3C BFD/4/BFD_CHANGE_FSM: Sess[21.1.1.2/21.1.1.1, LD/RD:33794/32833, Interface:GE1/0/8, SessType:Ctrl, LinkType:INET], Ver:1, Sta: INIT->UP, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 09:59:45:845 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.2/11.1.1.1, LD/RD:33793/32833, Interface:GE1/0/0, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->INIT, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 09:59:45:846 2024 H3C BFD/4/BFD_CHANGE_FSM: Sess[11.1.1.2/11.1.1.1, LD/RD:33793/32833, Interface:GE1/0/0, SessType:Ctrl, LinkType:INET], Ver:1, Sta: INIT->UP, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 10:01:08:642 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[21.1.1.2/21.1.1.1, LD/RD:33794/32833, Interface:GE1/0/8, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->INIT, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 10:01:08:644 2024 H3C BFD/4/BFD_CHANGE_FSM: Sess[21.1.1.2/21.1.1.1, LD/RD:33794/32833, Interface:GE1/0/8, SessType:Ctrl, LinkType:INET], Ver:1, Sta: INIT->UP, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 10:01:30:143 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.2/11.1.1.1, LD/RD:33793/32833, Interface:GE1/0/0, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->INIT, Diag: 0 (No Diagnostic), Applications: STATIC4

%Jan 29 10:01:30:144 2024 H3C BFD/4/BFD_CHANGE_FSM: Sess[11.1.1.2/11.1.1.1, LD/RD:33793/32833, Interface:GE1/0/0, SessType:Ctrl, LinkType:INET], Ver:1, Sta: INIT->UP, Diag: 0 (No Diagnostic), Applications: STATIC4

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<H3C>%Jan 29 09:59:02:330 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.1/11.1.1.2, LD/RD:32833/33793, Interface:GE1/0/1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 (Control Detection Time Expired)

%Jan 29 09:59:02:332 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.1/11.1.1.2, LD/RD:32833/33793, Interface:GE1/0/1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->UP, Diag: 0 (No Diagnostic)

%Jan 29 10:00:42:597 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.1/11.1.1.2, LD/RD:32833/33793, Interface:GE1/0/1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 (Control Detection Time Expired)

%Jan 29 10:00:42:598 2024 H3C BFD/5/BFD_CHANGE_FSM: Sess[11.1.1.1/11.1.1.2, LD/RD:32833/33793, Interface:GE1/0/1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->UP, Diag: 0 (No Diagnostic)

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<H3C>dis bfd sess

Total sessions: 1 Up sessions: 1 Init mode: Active

IPv4 session working in control packet mode:

LD/RD SourceAddr DestAddr State Holdtime Interface

32833/33793 11.1.1.1 11.1.1.2 Up 1326ms GE1/0/1

<H3C>dis bfd sess

Total sessions: 2 Up sessions: 2 Init mode: Active

IPv4 session working in control packet mode:

LD/RD SourceAddr DestAddr State Holdtime Interface

33793/32833 11.1.1.2 11.1.1.1 Up 0ms GE1/0/0

33794/32833 21.1.1.2 21.1.1.1 Up 0ms GE1/0/8