Disaster recovery for active-standby data center using route health and BGP
First Claim
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1. A stand-by network device comprising:
- a first interface to receive a list of prefixes from a primary network device of a primary data center, the list of prefixes being storable in a gateway table accessible to the stand-by network device, the first interface being configured to receive a prefix from the primary network device over an internal BGP data link; and
a second interface to advertise a secondary prefix to at least one of a plurality of internet service providers, if a prefix is missing from the list of prefixes storable in the gateway table accessible to the stand-by network device and received from the primary network device over the internal BGP data link.
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Abstract
The present invention provides an active/standby data center that avoids the delay associated with a cached DNS entry to switch from the active data center to the standby data center. When the active data center becomes unavailable, the standby data center advertises the same address as the primary data center so the change over occurs quickly. When the IP address of the primary data center is no longer visible to the standby data center, the standby data center begins to advertise.
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Citations
15 Claims
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1. A stand-by network device comprising:
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a first interface to receive a list of prefixes from a primary network device of a primary data center, the list of prefixes being storable in a gateway table accessible to the stand-by network device, the first interface being configured to receive a prefix from the primary network device over an internal BGP data link; and a second interface to advertise a secondary prefix to at least one of a plurality of internet service providers, if a prefix is missing from the list of prefixes storable in the gateway table accessible to the stand-by network device and received from the primary network device over the internal BGP data link. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving a list of prefixes from a primary network device of a primary data center, the list of prefixes being storable in a gateway table accessible to a stand-by network device, the stand-by network device being configured to receive a prefix from the primary network device over an internal BGP data link; and advertising a secondary prefix to at least one of a plurality of internet service providers, if a prefix is missing from the list of prefixes storable in the gateway table accessible to the stand-by network device and received from the primary network device over the internal BGP data link. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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means for receiving a list of prefixes from a primary network device of a primary data center, the list of prefixes being storable in a gateway table accessible to a stand-by network device, the stand-by network device being configured to receive a prefix from the primary network device over an internal BGP data link; and means for advertising a secondary prefix to at least one of a plurality of internet service providers, if a prefix is missing from the list of prefixes storable in the gateway table accessible to the stand-by network device and received from the primary network device over the internal BGP data link.
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Specification