A device can be configured so that the AS_PATH check function for routes learned from a specific location is disabled, and routes that contain the recipient BGP speaker's AS number are not rejected.
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Enter the
configure terminal command to access global configuration mode.
device# configure terminal
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Enter the
router bgp command to enable BGP routing.
device(config)# router bgp
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Enter the
address-family ipv6 unicast command to enter BGP IPv6 address family unicast configuration mode.
device(config-bgp-router)# address-family ipv6 unicast
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Enter the
neighbor
ipv6-address
allowas-in command and specify a
number to disable the BGP AS_PATH check function, and specify the number of times that the AS path of a received route may contain the recipient BGP speaker's AS number and still be accepted.
device(config-bgp-ipv6u)# neighbor 2001:db8:e0ff:783a::4 allowas-in 3
The following example specifies that the AS path of a received route may contain the recipient BGP speaker's AS number three times and still be accepted.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# neighbor 2001:db8:e0ff:783a::4 allowas-in 3
