Bfd for reliability

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Hi All,

Regarding the HighAvailability scenario between the SW1 & SW4 to be accomplished,

 i m not able to get the downtime to less than 7ping drops;
while the down active link is retrieved back..

I am getting the drop when I reconnect back the port on vlan24 on SW4 connected to SW9.
Please find the bfd config done on SW4 & suggest for the required.

[SW4]di th
isis 1
 is-level level-2
 bfd all-interfaces enable
 bfd all-interfaces min-tx-interval 10 min-rx-interval 10 detect-multiplier 4 network-entity 10.0101.5000.0011.00

  [SW4]di bfd session all
--------------------------------------------------------------------------------
Local Remote     PeerIpAddr      State     Type        InterfaceName
--------------------------------------------------------------------------------
8228  8272       10.200.0.53     Up        D_IP_IF     Vlanif24
--------------------------------------------------------------------------------
     Total UP/DOWN Session Number : 1/0

[SW4]di cu int vl 24
interface Vlanif24
 ip address 10.200.0.54 255.255.255.252
 isis enable 1
 mpls
 mpls ldp


Thanks

Kumar

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