两台6608之间bgp邻居状态idle与established切换

两台6608之间bgp邻居状态idle与established切换，设备之间直连。

日志：%Sep 1 13:51:24:541 2022 ZJHZ-XDL-P-SR6608 BFD/5/BFD_CHANGE_FSM: Sess[10.1.1.17/10.1.1.18, LD/RD:12471/12467, Interface:N/A, SessType:Ctrl, LinkType:INET], Ver:1, Sta: DOWN->INIT, Diag: 0 %Sep 1 13:51:24:541 2022 ZJHZ-XDL-P-SR6608 BFD/5/BFD_CHANGE_FSM: Sess[10.1.1.17/10.1.1.18, LD/RD:12471/12467, Interface:N/A, SessType:Ctrl, LinkType:INET], Ver:1, Sta: INIT->UP, Diag: 0 %Sep 1 13:51:26:548 2022 ZJHZ-XDL-P-SR6608 BFD/5/BFD_CHANGE_FSM: Sess[10.1.1.17/10.1.1.18, LD/RD:12471/12467, Interface:N/A, SessType:Ctrl, LinkType:INET], Ver:1, Sta: UP->DOWN, Diag: 1 %Sep 1 13:51:26:551 2022 ZJHZ-XDL-P-SR6608 BGP/5/BGP_STATE_CHANGED: BGP.: 10.1.1.18 state has changed from ESTABLISHED to IDLE for session down event received from BFD. %Sep 1 13:51:28:532 2022 ZJHZ-XDL-P-SR6608 BGP/5/BGP_STATE_CHANGED: BGP.: 10.1.1.18 State is changed from OPENCONFIRM to ESTABLISHED.  

接口配置：

 interface GigabitEthernet2/1

 mtu 9100

 ip address 11.48.x.x 255.255.255.252 

 pim sm

 isis enable 1

 isis circuit-level level-2

 isis circuit-type p2p 

 isis cost 2000

 isis authentication-mode md5 cipher $c$3$V+ 

 isis bfd enable

 mpls enable 

 mpls ldp enable 

 bfd min-transmit-interval 100

 bfd min-receive-interval 100 

 bfd detect-multiplier 3

 bgp 19000

 peer 10.1.1.18 group VRR

 peer 10.1.1.18 bfd