filter routes from private AS - Cisco Community

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How do I filter internet routes if they are from private AS?

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Hi,

you are receiving BGP prefixes with private AS numbers included within the AS-PATH from your ISP?

This should not happen within the Internet, you should ask your ISP to investigate.

As a workaround, you could create some neighbor filter-list denying any private AS within the AS-PATH.

See http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp3.html#wp1037204

HTH,

Milan

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