Comparison to normal BGP
Responsiveness to link state or topology changes is immediate for new requests
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- If a link fails, the corresponding IP won’t be chosen for new requests anymore because all BGP NLRI information is gone, hence no more best path for this upstream
In the case of a upstream link failure, the maximum black hole time for a particular requestor is the configured DNS resource record expiration timeout
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- Affects only requestors who had this particular upstream link as best path
- The DNS RR expiration timeout has to be chosen carefully!