Disable the BGP4+ AS_PATH Check Function

1. Access global configuration mode.
   

   device# configure terminal

2. Access BGP configuration mode.
   

   device(config)# router bgp

3. Access IPv6 address family unicast configuration mode.
   

   device(config-bgp-router)# address-family ipv6 unicast

4. Disable the BGP AS_PATH check function.
   

   device(config-bgp-ipv6u)# neighbor 2001:db8:e0ff:783a::4 allowas-in 3

   This example specifies the neighbor allowas-in command, the IPv6 address of the neighbor, and the variable 3, which represents the number of times that the AS path of a received route can contain the BGP speaker's ASN and still be accepted.

The following example summarizes the commands in this procedure.

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