06-17-2019 11:55 AM
in this link Link it is described about Default BGP Scanner Behavior
BGP monitors the next hop of installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner is used to poll the RIB for this information every 60 seconds. During the 60 second time period between scan cycles, Interior Gateway Protocol (IGP) instability or other network failures can cause black holes and routing loops to temporarily form.
that line i change to blue color i am not understanding what does meaning by cause black holes
regard
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06-17-2019 12:12 PM - edited 06-17-2019 12:13 PM
In a network context when someone talks about traffic being black holed they usually mean packets being dropped by the network.
So the BGP scanner checks the IP routing table for a next hop IP and finds it available but before the next run of the BGP scanner the next hop becomes unreachable but BGP still thinks it is reachable and so still uses routes with that next hop IP so traffic would be black holed until the BGP scanner was run again and the routing information was updated.
Jon
06-17-2019 12:12 PM - edited 06-17-2019 12:13 PM
In a network context when someone talks about traffic being black holed they usually mean packets being dropped by the network.
So the BGP scanner checks the IP routing table for a next hop IP and finds it available but before the next run of the BGP scanner the next hop becomes unreachable but BGP still thinks it is reachable and so still uses routes with that next hop IP so traffic would be black holed until the BGP scanner was run again and the routing information was updated.
Jon
06-17-2019 01:13 PM
thanks for your replying .
06-17-2019 03:30 PM
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