Main Troubleshooting Flowchart
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Troubleshoot BGP Neighbor Establishment
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Troubleshoot Routes Missing from the Routing Table
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Troubleshoot Multihoming Inbound
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Troubleshoot BGP Route Advertisement
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Troubleshoot Multihoming Outbound
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source:
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/22166-bgp-trouble-main.html?referring_site=bodynav
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