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Почему рвётся ipsec между cisco 2951 и 881 каждые две минуты?



Добрый день, коллеги!

Есть cisco 2951 с ipsec туннелями по городам, есть cisco 881 на которой туннель до 2951 обрывается каждые две минуты. Есть аналогичные cisco 881 с такой же версией ios и конфигом, прекрасно работающие.
Что не так?

sh run на 2951:
c2951-universalk9-mz.SPA.153-3.M.bin
.
.
.
!
crypto isakmp policy 1
 encr aes
 hash md5
 authentication pre-share
!
crypto isakmp policy 2
 encr aes 256
 authentication pre-share
 group 2
!
crypto isakmp policy 3
 encr 3des
 hash md5
 authentication pre-share
!
crypto isakmp policy 4
 authentication pre-share
!
crypto isakmp policy 12
 encr 3des
 hash md5
 authentication pre-share
 group 2
crypto isakmp key THISISKEY address 85.XXX.XXX.10
crypto isakmp invalid-spi-recovery
crypto isakmp keepalive 10 periodic
!
crypto ipsec security-association replay window-size 128
!
crypto ipsec transform-set VPN_Office esp-aes esp-md5-hmac
 mode tunnel
crypto ipsec df-bit clear
!
crypto ipsec profile VPN_Office
 set transform-set VPN_Office
!
.
.
.
!
interface Tunnel19
 description ---===piter===---
 ip address 172.16.100.89 255.255.255.252
 tunnel source 85.XXX.XXX.14
 tunnel mode ipsec ipv4
 tunnel destination 85.XXX.XXX.10
 tunnel protection ipsec profile VPN_Office
!
.
.
.


sh run на 881:
c880data-universalk9-mz.153-3.M.bin
.
.
.
!
crypto isakmp policy 1
 encr aes
 hash md5
 authentication pre-share
!
crypto isakmp policy 2
 encr aes 256
 authentication pre-share
 group 2
crypto isakmp key THISISKEY address 85.XXX.XXX.14
crypto isakmp keepalive 10 periodic
!
!
crypto ipsec transform-set VPN_Office esp-aes esp-md5-hmac
 mode tunnel
!
crypto ipsec profile VPN_Office
 set transform-set VPN_Office
!
!
!
!
interface Tunnel19
 description ---===moscow===---
 ip address 172.16.100.90 255.255.255.252
 tunnel source 85.XXX.XXX.10
 tunnel mode ipsec ipv4
 tunnel destination 85.XXX.XXX.14
 tunnel protection ipsec profile VPN_Office
!
.
.
.


sh cry sess det на 2951:
Interface: Tunnel19
Uptime: 00:00:40
Session status: UP-ACTIVE
Peer: 85.XXX.XXX.10 port 500 fvrf: (none) ivrf: (none)
      Phase1_id: 85.XXX.XXX.10
      Desc: (none)
  Session ID: 0
  IKEv1 SA: local 85.XXX.XXX.14/500 remote 85.XXX.XXX.10/500 Active
          Capabilities:D connid:12866 lifetime:23:58:53
  IPSEC FLOW: permit ip 0.0.0.0/0.0.0.0 0.0.0.0/0.0.0.0
        Active SAs: 2, origin: crypto map
        Inbound:  #pkts dec'ed 759646 drop 2 life (KB/Sec) 4178190/3559
        Outbound: #pkts enc'ed 564876 drop 0 life (KB/Sec) 4191031/3559


sh cry sess det на 811:
Interface: Tunnel19
Uptime: 00:01:02
Session status: UP-ACTIVE
Peer: 85.XXX.XXX.14 port 500 fvrf: (none) ivrf: (none)
      Phase1_id: 85.XXX.XXX.14
      Desc: (none)
  Session ID: 0
  IKEv1 SA: local 85.XXX.XXX.10/500 remote 85.XXX.XXX.14/500 Active
          Capabilities:D connid:2065 lifetime:23:58:30
  IPSEC FLOW: permit ip 0.0.0.0/0.0.0.0 0.0.0.0/0.0.0.0
        Active SAs: 2, origin: crypto map
        Inbound:  #pkts dec'ed 222869 drop 0 life (KB/Sec) 4346407/3537
        Outbound: #pkts enc'ed 374400 drop 0 life (KB/Sec) 4338287/3537

Interface: FastEthernet4
Uptime: 00:01:02
Session status: DOWN-NEGOTIATING
Peer: 85.XXX.XXX.14 port 500 fvrf: (none) ivrf: (none)
      Phase1_id: 85.XXX.XXX.14
      Desc: (none)
  Session ID: 0
  IKEv1 SA: local 85.XXX.XXX.10/500 remote 85.XXX.XXX.14/500 Inactive
          Capabilities:(none) connid:0 lifetime:0


В логах 2951:
Jun  4 16:29:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:31:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:33:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:35:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:37:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:39:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:41:12 rojg2951 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer


Дебаг на 2951:
Jun  4 16:36:23 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
Jun  4 16:36:23 Moscow: IPSEC(ERROR): [ident_update_final_flow_stats] Peer index node NULL for peer index 0  when corresponding flow id 0x14000667 was completed

Jun  4 16:36:39 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up
Jun  4 16:37:12 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:37:40 Moscow: ISAKMP:(0):Invalid IKE exchange type 243
Jun  4 16:37:40 Moscow: ISAKMP:(0):Bad header. IKE Packet dropped.
Jun  4 16:37:45 Moscow: ISAKMP:(0):Invalid IKE exchange type 243
Jun  4 16:37:45 Moscow: ISAKMP:(0):Bad header. IKE Packet dropped.
Jun  4 16:38:13 Moscow: ISAKMP:(12855):deleting SA reason "Death by retransmission P1" state (I) QM_IDLE       (peer 85.XXX.XXX.10)
Jun  4 16:38:13 Moscow: ISAKMP:(12855):deleting SA reason "Death by retransmission P1" state (I) QM_IDLE       (peer 85.XXX.XXX.10)
Jun  4 16:38:23 Moscow: ISAKMP:(0):Can't decrement IKE Call Admission Control stat  outgoing_negotiating since it's already 0.
Jun  4 16:38:28 Moscow: IPSEC(send_delete_notify_kmi): not sending KEY_ENGINE_DELETE_SAS
Jun  4 16:38:28 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
Jun  4 16:38:28 Moscow: IPSEC(ERROR): [ident_update_final_flow_stats] Peer index node NULL for peer index 0  when corresponding flow id 0x14000669 was completed

Jun  4 16:38:40 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up
Jun  4 16:39:12 Moscow: %CRYPTO-4-IKMP_NO_SA: IKE message from 85.XXX.XXX.10 has no SA and is not an initialization offer
Jun  4 16:40:13 Moscow: ISAKMP:(12856):deleting SA reason "Death by retransmission P1" state (I) QM_IDLE       (peer 85.XXX.XXX.10)
Jun  4 16:40:13 Moscow: ISAKMP:(12856):deleting SA reason "Death by retransmission P1" state (I) QM_IDLE       (peer 85.XXX.XXX.10)
Jun  4 16:40:23 Moscow: ISAKMP:(0):Can't decrement IKE Call Admission Control stat  outgoing_negotiating since it's already 0.
Jun  4 16:40:28 Moscow: IPSEC(send_delete_notify_kmi): not sending KEY_ENGINE_DELETE_SAS
Jun  4 16:40:28 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
Jun  4 16:40:28 Moscow: IPSEC(ERROR): [ident_update_final_flow_stats] Peer index node NULL for peer index 0  when corresponding flow id 0x1400066B was completed

Jun  4 16:40:41 Moscow: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up


Дебаг на 881:
.Jun  4 16:52:46.249: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up
.Jun  4 16:54:13.005: ISAKMP:(0): Phase 1 negotiation failed with DPD active; deleting IKE/IPSec SAs
.Jun  4 16:54:13.005: ISAKMP:(2061):deleting SA reason "Death by retransmission P1" state (R) QM_IDLE       (peer 85.XXX.XXX.14)
.Jun  4 16:54:13.005: ISAKMP:(0):deleting SA reason "Death by retransmission P1" state (R) MM_SA_SETUP (peer 85.XXX.XXX.14)
.Jun  4 16:54:13.005: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
.Jun  4 16:54:13.009: ISAKMP:(0):deleting SA reason "Death by retransmission P1" state (R) MM_SA_SETUP (peer 85.XXX.XXX.14)
.Jun  4 16:54:13.013: ISAKMP:(2061):deleting SA reason "Death by retransmission P1" state (R) QM_IDLE       (peer 85.XXX.XXX.14)
.Jun  4 16:54:13.013: IPSEC(ERROR): [ident_update_final_flow_stats] Peer index node NULL for peer index 0  when corresponding flow id 0x14000017 was completed

.Jun  4 16:54:13.193: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=85.XXX.XXX.10, prot=50, spi=0x5CD3DCBE(1557388478), srcaddr=85.XXX.XXX.14, input interface=FastEthernet4
.Jun  4 16:54:47.073: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up
.Jun  4 16:56:13.001: ISAKMP:(0): Phase 1 negotiation failed with DPD active; deleting IKE/IPSec SAs
.Jun  4 16:56:13.001: ISAKMP:(2062):deleting SA reason "Death by retransmission P1" state (R) QM_IDLE       (peer 85.XXX.XXX.14)
.Jun  4 16:56:13.001: ISAKMP:(0):deleting SA reason "Death by retransmission P1" state (R) MM_SA_SETUP (peer 85.XXX.XXX.14)
.Jun  4 16:56:13.001: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
.Jun  4 16:56:13.009: ISAKMP:(0):deleting SA reason "Death by retransmission P1" state (R) MM_SA_SETUP (peer 85.XXX.XXX.14)
.Jun  4 16:56:13.009: ISAKMP:(2062):deleting SA reason "Death by retransmission P1" state (R) QM_IDLE       (peer 85.XXX.XXX.14)
.Jun  4 16:56:13.013: IPSEC(ERROR): [ident_update_final_flow_stats] Peer index node NULL for peer index 0  when corresponding flow id 0x14000019 was completed

.Jun  4 16:56:13.021: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=85.XXX.XXX.10, prot=50, spi=0xE15B6CBD(3780865213), srcaddr=85.XXX.XXX.14, input interface=FastEthernet4
.Jun  4 16:56:47.957: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to up
.Jun  4 16:58:12.997: ISAKMP:(0): Phase 1 negotiation failed with DPD active; deleting IKE/IPSec SAs
.Jun  4 16:58:12.997: ISAKMP:(2063):deleting SA reason "Death by retransmission P1" state (R) QM_IDLE       (peer 85.XXX.XXX.14)
.Jun  4 16:58:12.997: ISAKMP:(0):deleting SA reason "Death by retransmission P1" state (R) MM_SA_SETUP (peer 85.XXX.XXX.14)
.Jun  4 16:58:12.997: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel19, changed state to down
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Ответы на вопрос 1
@likler
На 881 не вижу crypto isakmp invalid-spi-recovery
Зато вижу различный тип encr

Еще можно уточнить - что с настройкой часов на обоих цисках?
Также интересуют версии IOS
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