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S5720-HI BFD unstable when BFD number is more than seventeen

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Issue Description

On S5720-32C-HI-24S-AC, to achieve the recovery time within the required 50ms,currently 17 BFD sessions are configured for VRRP and it working fine. As soon as customer configure another BFD sessions for newly added Vlanif all the BFD sessions starts flapping randomly.

transparent.gif Alarm Information

Apr  4 2018 17:27:48+03:00 ICC-LAN-UP-1 %BFD/4/STACHG_TODWN(l)[49]:BFD session changed to Down. (SlotNumber=0, Discriminator=8197, Diagnostic=DetectDown, Applications=VRRP | AUTO, ProcessPST=False, BindInterfaceName=Vlanif166, InterfacePhysicalState=Up, InterfaceProtocolState=Up)

Apr  4 2018 17:27:48+03:00 ICC-LAN-UP-1 %BFD/4/STACHG_TOUP(l)[50]:BFD session changed to Up. (SlotNumber=0, Discriminator=8197, FormerStatus=Down, Applications=VRRP | AUTO, BindInterfaceName=Vlanif166, ProcessPST=False)

Apr  4 2018 17:27:48+03:00 ICC-LAN-UP-1 %BFD/4/STACHG_TODWN(l)[51]:BFD session changed to Down. (SlotNumber=0, Discriminator=8210, Diagnostic=DetectDown, Applications=VRRP | AUTO, ProcessPST=False, BindInterfaceName=Vlanif15, InterfacePhysicalState=Up, InterfaceProtocolState=Up)

Apr  4 2018 17:27:48+03:00 ICC-LAN-UP-1 %BFD/4/STACHG_TOUP(l)[52]:BFD session changed to Up. (SlotNumber=0, Discriminator=8210, FormerStatus=Down, Applications=VRRP | AUTO, BindInterfaceName=Vlanif15, ProcessPST=False)

transparent.gif Handling Process
1. Customer's need is that the recovery time should be within 50ms.
2. The number of the BFD session is more than seventeen when the issue happen. 
3. Checking the configuration, "set service-mode enhanced" doesn't configure.
transparent.gif Root Cause

On S5720-Hi,BFD process by software. Ff you want that the VRRP recovery time should be within 50ms, you need to add command "set service-mode enhanced ", with this command bfd is processed by hardware.

transparent.gif Solution

<HUAWEI> system-view

[HUAWEI] set service-mode enhanced

Warning: This command will effect forward performance. Continue? [Y/N]:y

  • x
  • convention:

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