We have announced our Network /24 through Primary and Backup ISP but it is observed that intermittently we are facing an issue with an announcement of our Network it has been noticed that inspite of we configuring sec ISP as a backup link the traffic from outside world get automatically diverted to sec ISP whereas BGP peering with Primary Link is up, after shutting down sec ISP Link the incoming traffic again moves back to Primary Link.
In order to make sec ISP as a Backup we have appended AS while announcing Network through sec ISP.
For outgoing policy we have set local preference on the router and for incoming we have the AS prepend policy.
Under ideal conditions all router servers show that traffic is flowing thru ISP1, out of the blue incoming traffic comes through ISP2 and it automatically gets normalized or we have to shut the ISP2 link.
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