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Jun 16 2014 10:16:10 NE40EX3-B2 %%01BFD/4/STACHG_TOUP(l):Slot=2;BFD session changed to Up. (SlotNumber=2, Discriminator=8200, FormerStatus=Init, Applications=AUTO, BindInterfaceName=Vlanif406, ProcessPST=False)
Jun 16 2014 10:16:07 NE40EX3-B2 %%01BFD/4/STACHG_TODWN(l):Slot=2;BFD session changed to Down. (SlotNumber=2, Discriminator=8200, Diagnostic=DetectDown, Applications=AUTO, ProcessPST=False, BindInterfaceName=Vlanif406, InterfacePhysicalState=Down, InterfaceProtocolState=Down)
Jun 16 2014 10:10:47 NE40EX3-B2 %%01BFD/4/STACHG_TOUP(l):Slot=2;BFD session changed to Up. (SlotNumber=2, Discriminator=9410, FormerStatus=Init, Applications=AUTO, BindInterfaceName=Vlanif413, ProcessPST=False)
Jun 16 2014 10:10:44 NE40EX3-B2 %%01BFD/4/STACHG_TODWN(l):Slot=2;BFD session changed to Down. (SlotNumber=2, Discriminator=9410, Diagnostic=DetectDown, Applications=AUTO, ProcessPST=False, BindInterfaceName=Vlanif413, InterfacePhysicalState=Down, InterfaceProtocolState=Down)
General connectivity is given below:
VRRP is configured between NE40-X3-B1 and NE40-X3-B2.
Few port were configured full duplex on both NEs and few were set to auto negotiation.
At BSC end both master and slave ports are configured to be full duplex.
As there were continuous BFD Alarms for on both NEs. IP Connectivity was fine. So this issue must be related to Physical Layer/Access Layer.
So initially it was found that there must be duplex mismatch issue. However when configurations were checked, on Gi 2/0/3 it was found that port was Full Duplex configured on B1 but still there were alarms. So following analysis was made:
There are three scenario of BFD Alarms on Vlanif on NE40.
1) Duplex mismatch on both NE40-X3-B1 and NE40-X3-B2 with BSC So alarms will appear for Vlan allowed on port (Gi 2/0/0) of both NEs.
2) Duplex mismatch on NE40-X3-B1 (VRRP Master) and BSC Master Card only. So alarm will appear for Vlan allowed on port (Gi 2/0/1) of NE40-X3-B1 only. Alarm will not appear for respective Vlan on NE40-X3-B2.
3) Third scenario is interesting. Here Duplex mismatch is between NE40-X3-B2 (VRRP Slave) and BSC Master Card only. In this case BFD alarm will appear for Vlan allowed on Port (Gi 2/0/3) on NE40-X3-B1 and NE40-X3-B2 both, however there is no duplex mismatch on NE40-X3-B1. Reason for alarm on B1 is that its learning MAC for BSC IP from B2 and BFD packets are going to BSC from B1 via B2. (Refer to Figure 4)