My BGP router does not advertise configured prefixes

Question

I have two Routers, which are Router1(BGP 100) and Router2(BGP 200), they have set up BGP neighbor for each other:

this is my Router1's BGP configuration:

！
router bgp 100
 bgp log-neighbor-changes
 no synchronization
 neighbor 12.0.0.2 remote-as 200
!

and this is my Router2's BGP configuration:

 !
 router bgp 200
 bgp log-neighbor-changes
 no synchronization
 neighbor 12.0.0.1 remote-as 100
 network 2.0.0.0 mask 255.255.255.0
!

you see, in my BGP 200, I have declared the network network 2.0.0.0 mask 255.255.255.0.

but why in my Router1, there do not have the 2.0.0.0/24 route?

this is the Router1's route:

     1.0.0.0/32 is subnetted, 1 subnets
C       1.0.0.1/32 is directly connected, Loopback0
     12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       12.0.0.0/24 is directly connected, GigabitEthernet0/0
L       12.0.0.1/32 is directly connected, GigabitEthernet0/0

---

In my Router2, show ip route there show

     2.0.0.0/32 is subnetted, 1 subnets
C       2.0.0.2/32 is directly connected, Loopback0
     12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       12.0.0.0/24 is directly connected, GigabitEthernet0/0/0
L       12.0.0.2/32 is directly connected, GigabitEthernet0/0/0

In Router1, I show the bgp neighbors:

Router1#  show ip bgp neighbors 
BGP neighbor is 12.0.0.2,  remote AS 200, external link
  BGP version 4, remote router ID 2.0.0.2
  BGP state = Established, up for 00:09:05
  Last read 00:09:05, last write 00:09:05, hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    Route refresh: advertised and received(new)
    Address family IPv4 Unicast: advertised and received
  Message statistics:
    InQ depth is 0
    OutQ depth is 0

                         Sent       Rcvd
    Opens:                  1          1
    Notifications:          0          0
    Updates:                0          0
    Keepalives:            10         10
    Route Refresh:          0          0
    Total:                 11         11
  Default minimum time between advertisements runs is 30 seconds

 For address family: IPv4 Unicast
  BGP table version 1, neighbor version 6/0
  Output queue size : 0
  Index 1, Offset 0, Mask 0x2
  1 update-group member
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0 (Consumes 0 bytes)
    Prefixes total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          1
    Used as multipath:            n/a          0

                                       Outbound    Inbound
      Local Policy Denied Prefixes:    --------    -------
        Total:                                0          0
      Number of NLRIs in the update sent: max 3, min 1

  Address tracking is enabled, the RIB does have a route to 12.0.0.2
  Connections established 1; dropped 0
  Last reset never
  Transport(tcp) path-mtu-discovery is enabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0 
Connection is ECN Disabled, Minimum incoming TTL 0, Outgoing TTL 1
Local host: 12.0.0.1, Local port: 1025
Foreign host: 12.0.0.2, Foreign port: 179
Connection tableid (VRF): 0

Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)

Event Timers (current time is 0xC69F4):
Timer          Starts    Wakeups            Next
Retrans             0          0             0x0
TimeWait            0          0             0x0
AckHold            10          0             0x0
SendWnd             0          0             0x0
KeepAlive          10          0             0x0
GiveUp              0          0             0x0
PmtuAger            0          0             0x0
DeadWait            0          0             0x0
Linger              0          0             0x0
ProcessQ            0          0             0x0

iss: 2057115318  snduna: 2057115748  sndnxt: 2057115748     sndwnd:  15955
irs: 3480424370  rcvnxt: 3480424751  rcvwnd:      16004  delrcvwnd:    380

SRTT: 259 ms, RTTO: 579 ms, RTV: 320 ms, KRTT: 0 ms
minRTT: 16 ms, maxRTT: 300 ms, ACK hold: 200 ms
Status Flags: passive open, gen tcbs
Option Flags: nagle, path mtu capable
IP Precedence value : 6

Datagrams (max data segment is 1460 bytes):
Rcvd: 11 (out of order: 0), with data: 0, total data bytes: 0
Sent: 11 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 0, total data bytes: 0
 Packets received in fast path: 0, fast processed: 0, slow path: 0
 fast lock acquisition failures: 0, slow path: 0

---

EDIT-02

I run the show ip bgp, there seems has no bgp connection:

Router1#show ip bgp 
BGP table version is 1, local router ID is 1.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

Answer 1

Router 2 will not advertise networks that are not in its routing table. So if router 2 does not have a route to 2.0.0.0, it will not advertise it. This prevents BGP routers from "blackholing" traffic (i.e. advertising prefixes it can't reach).