irf 加vlan的bfd

https://www.h3c.com/cn/d_202103/1390248_30005_0.htm

可以参考下这个

聚合口与你这个原理是一样的，快速检测IRF是否分裂，参考如下：

#

interface Route-Aggregation1

 mad bfd enable

 mad ip address 192.168.2.1 255.255.255.0 member 1

 mad ip address 192.168.2.2 255.255.255.0 member 2

#

[Device A]dis mad verbose

Multi-active recovery state: No

Excluded ports (user-configured):

Excluded ports (system-configured):

  GigabitEthernet1/5/0

  GigabitEthernet2/5/0

MAD ARP disabled.

MAD ND disabled.

MAD LACP disabled.

MAD BFD enabled interface: Route-Aggregation1

  MAD status                 : Normal

  Member ID   MAD IP address       Neighbor   MAD status

  1           192.168.2.1/24       2          Normal

  2           192.168.2.2/24       1          Normal

IRF正常的情况下，接口IP只有一个生效（只显示主机的IP），故该BFD是down的：

[Device A]dis ip int b

*down: administratively down

(s): spoofing  (l): loopback

Interface           Physical Protocol IP address/Mask    VPN instance Description

GE1/0/0             up       up       172.16.0.2/24      --           --

GE1/5/1             up       up       --                 --           --

GE1/6/0             down     down     --                 --           --

GE1/6/1             down     down     --                 --           --

GE2/0/0             up       up       172.16.1.2/24      --           --

GE2/5/1             up       up       --                 --           --

GE2/6/0             down     down     --                 --           --

GE2/6/1             down     down     --                 --           --

RAGG1               up       up       192.168.2.1/24     --           --

Ser1/1/0            down     down     --                 --           --

<Device A>dis bfd s

 Total sessions: 1        Up sessions: 0        Init mode: Active

 IPv4 session working in control packet mode:

 LD/RD           SourceIP        DestinationIP   State   Holdtime    Interface

 33793/0         192.168.2.1     192.168.2.2     Down    0ms         RAGG1

如果IRF分裂，备机临时认为自己是主设备，接口保持Up，BFD会出现up的情况：

[Device A]%Aug 13 17:03:23:333 2021 Device A LAGG/6/LAGG_ACTIVE: Member port GE1/5/1 of aggregation group RAGG1 changed to the active state.

%Aug 13 17:03:23:334 2021 Device A IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet1/5/1 changed to up.

%Aug 13 17:03:23:335 2021 Device A IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet1/5/1 changed to up.

%Aug 13 17:03:23:335 2021 Device A IFNET/3/PHY_UPDOWN: Physical state on the interface Route-Aggregation1 changed to up.

%Aug 13 17:03:23:335 2021 Device A IFNET/5/LINK_UPDOWN: Line protocol state on the interface Route-Aggregation1 changed to up.

d%Aug 13 17:03:23:380 2021 Device A BFD/5/BFD_CHANGE_FSM: Sess[192.168.2.1/192.168.2.2, LD/RD:33793/33793, Interface:RAGG1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->UP, Diag: 0 (NoDiagnostic)

%Aug 13 17:03:23:433 2021 Device A LAGG/6/LAGG_INACTIVE_PHYSTATE: Member port GE1/5/1 of aggregation group RAGG1 changed to the inactive state, because the physical state of the port is don.

%Aug 13 17:03:23:434 2021 Device A IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet1/5/1 changed to down.

%Aug 13 17:03:23:434 2021 Device A IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet1/5/1 changed to down.

%Aug 13 17:03:23:435 2021 Device A IFNET/3/PHY_UPDOWN: Physical state on the interface Route-Aggregation1 changed to down.

%Aug 13 17:03:23:435 2021 Device A IFNET/5/LINK_UPDOWN: Line protocol state on the interface Route-Aggregation1 changed to down.

备机检测到IRF冲突，MAD down接口后，BFD再次down：

[Device A]%Aug 13 17:03:28:385 2021 Device A BFD/5/BFD_CHANGE_FSM: Sess[192.168.2.1/192.168.2.2, LD/RD:33793/33793, Interface:RAGG1, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Dig: 1 (Control Detection Time Expired)