Refer to the exhibit R1 is migrating from ISP 1 to ISP 2. The R1 ISO image does not support the 4-byte AS feature. Which configuration on R1 can establish this EBGP session?
A. Router bgp 200
Neighbor 10.10.24.4 local-as-65600
B. Router bgp 200
Neighbor 10.10.24.4 remote-as 23456
C. Router bgp 200
Neighbor 10.10.24.4 remote-as 65600
D. Router bgp 200
Neighbor 10.10.24.4 local-as-23456
The answer sounds good, but then ISP2 will have to set the local-as 23456. If not it won’t work.
Ok, found that 23456 is reserved value for this situations where the real AS number will be sent as BGP attribute