Подняли BGP-сессию с партнёрами. Почему-то BGP отвергает анонсы. Помогите, пожалуйста, разобраться.

router bgp [aut-num]
no synchronization
bgp router-id x.x.x.34
bgp log-neighbor-changes
network c.c.c.0 mask 255.255.252.0
neighbor a.a.a.a remote-as 15640
neighbor a.a.a.a prefix-list 1i-BGP-IN in
neighbor a.a.a.a prefix-list 1i-BGP-OUT out
neighbor b.b.b.b remote-as 8342
neighbor b.b.b.b prefix-list RT-BGP-IN in
neighbor b.b.b.b prefix-list RT-BGP-OUT out
no auto-summary

ip prefix-list 1i-BGP-IN seq 10 permit 0.0.0.0/0    
ip prefix-list 1i-BGP-OUT seq 10 permit c.c.c.0/22 le 32
ip prefix-list RT-BGP-IN seq 10 permit 0.0.0.0/0
ip prefix-list RT-BGP-OUT seq 10 permit c.c.c.0/22 le 32

b.b.b.b - существующий аплинк, работает нормально.

7120#sh ip bgp
   Network          Next Hop            Metric LocPrf Weight Path
r> 0.0.0.0          217.106.128.33           0             0 8342 i
*> c.c.c.0/22       0.0.0.0                  0         32768 i

7120#sh ip bgp summ
BGP router identifier x.x.x.34, local AS number 13296
BGP table version is 4, main routing table version 4
2 network entries using 202 bytes of memory
2 path entries using 96 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 442 total bytes of memory
BGP activity 2/0 prefixes, 2/0 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
a.a.a.a         4 15640   10002     298        4    0    0 04:47:35        0
b.b.b.b         4  8342   14553   14686        4    0    0 1w3d            1

7120#sh ip bgp nei a.a.a.a
BGP neighbor is a.a.a.a,  remote AS 15640, external link
  BGP version 4, remote router ID a.a.a.124
  BGP state = Established, up for 04:49:02
  Last read 00:00:02, hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    Route refresh: advertised and received(old & 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:                6       9710
    Keepalives:           292        292
    Route Refresh:          1          2
    Total:                300      10004
  Default minimum time between advertisement runs is 30 seconds

For address family: IPv4 Unicast
  BGP table version 4, neighbor version 4
  Index 2, Offset 0, Mask 0x4
  Incoming update prefix filter list is 1i-BGP-IN
  Outgoing update prefix filter list is 1i-BGP-OUT
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               1          0
    Prefixes Total:                 5          0
    Implicit Withdraw:              3          0
    Explicit Withdraw:              1          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    prefix-list                           1      39389
    Total:                                1      39389
  Number of NLRIs in the update sent: max 1, min 0

  Connections established 1; dropped 0
  Last reset never
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: a.a.a.134, Local port: 179
Foreign host: a.a.a.133, Foreign port: 50087

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

Event Timers (current time is 0x34832FAC):
Timer          Starts    Wakeups            Next
Retrans           295          0             0x0
TimeWait            0          0             0x0
AckHold           462        178             0x0
SendWnd             0          0             0x0
KeepAlive          41          0             0x0
GiveUp              0          0             0x0
PmtuAger            0          0             0x0
DeadWait            0          0             0x0

iss: 1424603223  snduna: 1424609108  sndnxt: 1424609108     sndwnd:  16365
irs: 3300632527  rcvnxt: 3301419934  rcvwnd:      15538  delrcvwnd:    846

SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 300 ms, ACK hold: 200 ms
Flags: passive open, nagle, gen tcbs

Datagrams (max data segment is 1460 bytes):
Rcvd: 1068 (out of order: 63), with data: 941, total data bytes: 787406
Sent: 1013 (retransmit: 0, fastretransmit: 0), with data: 295, total data bytes: 5884