*Dec  6 11:06:55: %BGP-5-ADJCHANGE: Neighbor x.x.x.x Up.
...
*Dec  6 11:08:46: %BGP-5-ADJCHANGE: Neighbor x.x.x.x Down Interface Flap.         
*Dec  6 11:08:46: %BGP-3-NOTIFICATION: Sent to neighbor x.x.x.x 6/0 (Cease/Unspecified Error Subcode) 0 bytes.

DGS-3610#sh ip bgp summary
BGP router identifier х.х.х.х, local AS number хххх
BGP table version is 1
1 BGP AS-PATH entries
0 BGP Community entries
0 BGP Prefix entries (Maximum-prefix:4294967295)

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.5.192.66     4 44843      18      17        1    0    0 00:06:48        0

Total number of neighbors 1

DGS-3610#

DGS-3610#sh ip bgp ipv4 unicast neighbors 10.5.192.66
BGP neighbor is 10.5.192.66, remote AS ууууу, local AS ххххх, external link
 Description: Am                                                   
  BGP version 4, remote router ID 192.168.110.42                           
  BGP state = Established, up for 00:08:28                                 
  Last read 00:08:28, hold time is 90, keepalive interval is 30 seconds   
  Neighbor capabilities:                                                   
    Route refresh: advertised and received (old and new)                   
    Address family IPv4 Unicast: advertised and received                   
  Received 22 messages, 0 notifications, 0 in queue                       
    open message:1 update message:1 keepalive message:20                   
    refresh message:0 dynamic cap:0 notifications:0
  Sent 21 messages, 0 notifications, 0 in queue
    open message:1 update message:0 keepalive message:20
    refresh message:0 dynamic cap:0 notifications:0
  Route refresh request: received 0, sent 0
  Minimum time between advertisement runs is 30 seconds
  Default weight 3000

 For address family: IPv4 Unicast
  BGP table version 1, neighbor version 1
  Index 1, Offset 0, Mask 0x2
  NEXT_HOP is always this router
  Inbound path policy configured
  Outbound path policy configured
  Route map for incoming advertisements is *Am-in
  Route map for outgoing advertisements is *Am-out
  0 accepted prefixes
  0 announced prefixes

 Connections established 5; dropped 4
Local host: 10.5.192.65, Local port: 179
Foreign host: 10.5.192.66, Foreign port: 52410
Nexthop: 10.5.192.65
Last Reset: 00:10:05, due to BGP Notification sent
Notification Error Message: (Cease/Unspecified Error Subcode)

DGS-3610#

...
!                                                                       
route-map Am-out permit 130                                       
 match ip address prefix-list upstream-out                               
!                                                                       
route-map Am-out deny 210                                         
! 
...
!                                                                       
ip prefix-list upstream-out seq 10 permit <мой блок адресов для анонсирования>               
!                                                                       
...
router bgp ххххх
...
!
 address-family ipv4
 network <мой блок адресов для анонсирования> mask ...
 neighbor 10.5.192.66 activate
 neighbor 10.5.192.66 next-hop-self
 neighbor 10.5.192.66 route-map Am-in in
 neighbor 10.5.192.66 route-map Am-out out
 exit-address-family
...
 

DGS-3610#sh ip bgp neighbors 10.5.192.66
...
1 accepted prefixes
 0 announced prefixes
....