this is the 2821:

router bgp 64563
 bgp log-neighbor-changes
 neighbor 172.23.255.46 remote-as 64563

this is the 3845:

router bgp 64563
 bgp log-neighbor-changes
 bgp redistribute-internal
 redistribute connected
 redistribute static
 neighbor 172.23.255.1 remote-as 64563
 neighbor 172.23.255.47 remote-as 64563
 neighbor 172.23.255.47 next-hop-self