Project name: ccna-bgp29-remove-private-as

• R1

enable
configure terminal
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
exit
!
interface Loopback 1
ip address 1.0.0.1 255.0.0.0
no shutdown
exit
interface GigabitEthernet 0/0
ip address 2.0.0.1 255.255.255.0
no shutdown
exit
!
end
write

• R2

enable
configure terminal
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
exit
!
interface GigabitEthernet 0/0
ip address 3.0.0.2 255.255.255.0
no shutdown
exit
interface GigabitEthernet 0/1
ip address 2.0.0.2 255.255.255.0
no shutdown
exit
!
end
write

• R3

enable
configure terminal
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
exit
!
interface GigabitEthernet 0/1
ip address 3.0.0.3 255.255.255.0
no shutdown
exit
!
end
write

• R1

configure terminal
!
router bgp 65001
network 1.0.0.0 mask 255.0.0.0
neighbor 2.0.0.2 remote-as 20
exit
!
end

• R2

configure terminal
!
router bgp 20
neighbor 2.0.0.1 remote-as 65001
neighbor 3.0.0.3 remote-as 30
exit
!
end

• R3

configure terminal
!
router bgp 30
neighbor 3.0.0.2 remote-as 20
exit
!
end

R3#sh ip bgp
BGP table version is 2, local router ID is 3.0.0.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  1.0.0.0          3.0.0.2                                0 20 65001 i

• R2

configure terminal
!
router bgp 20
neighbor 3.0.0.3 remove-private-as
exit
!
end

• R3

show ip bgp

• R2

clear ip bgp * soft out

• R3

show ip bgp

R3#sh ip bgp
BGP table version is 3, local router ID is 3.0.0.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  1.0.0.0          3.0.0.2                                0 20 i

1. BGP - remove-private-as コンフィグ設定