Имеется два dlink`а 3526 и cisco 2950 соединенные друг с другом(треугольник).
Необходимо организовать MSTP на них с двумя инстанциями( все пользователи подключенные к DLink3526-kr1 - "прикручены" к 1 инстанции, все пользователи подключенные к DLink3526-kr2  - "прикручены" к 2 инстанции). В качестве корневого свича для обоих инстанции выступает 2950. Трафик для 1 инстанции сливается против часовой стреклки(Fa0/5), для 2ой - по часовой(Fa0/6).
Нужен совет - что может быть не так настроено. Складывается такое впечатление что dlink`и держатся вместе, а cisco сама по себе.

cisco 2950:
spanning-tree mode mst
spanning-tree loopguard default
spanning-tree portfast default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
spanning-tree mst configuration
name region1
revision 10
instance 1 vlan 103, 108, 850
instance 2 vlan 104, 109
!
spanning-tree mst hello-time 1
spanning-tree mst forward-time 5
spanning-tree mst max-age 7
spanning-tree mst 0-2 priority 24576

interface FastEthernet0/5
description DLink3526-kr1
switchport trunk allowed vlan 103,104,108,109,850
switchport mode trunk
speed 100
duplex full
spanning-tree portfast disable
!
interface FastEthernet0/6
description DLink3526-kr2
switchport trunk allowed vlan 103,104,108,109,850
switchport mode trunk
speed 100
duplex full
spanning-tree portfast disable

-------------------------------------------------------------------------
DLink3526-kr1:
# STP
config stp maxage 20 maxhops 20 forwarddelay 15 txholdcount 3 fbpdu enable
config stp version mstp
config stp priority 32768 instance_id 0
config stp lbd enable
config stp lbd_recover_timer 60
create stp instance_id 1
config stp instance_id 1 add_vlan 103
config stp instance_id 1 add_vlan 108
config stp instance_id 1 add_vlan 850
config stp priority 32768 instance_id 1
create stp instance_id 2
config stp instance_id 2 add_vlan 104
config stp instance_id 2 add_vlan 109
config stp priority 32768 instance_id 2
config stp mst_config_id name region1 revision_level 10
enable stp
config stp ports 1-24 externalCost auto hellotime 1 edge true p2p true state disable
config stp ports 1-24 lbd disable
config stp mst_ports 1,25 instance_id 0 internalCost 200000 priority 128
config stp ports 1-24 fbpdu disable
config stp mst_ports 2-24,26 instance_id 0 internalCost auto priority 128
config stp ports 25-26 externalCost auto hellotime 1 edge false p2p true state enable
config stp ports 25-26 lbd enable
config stp ports 25-26 fbpdu enable
config stp mst_ports 1-26 instance_id 1 internalCost auto priority 128
config stp mst_ports 1-26 instance_id 2 internalCost auto priority 128

Configuration Name : [region1                         ]  Revision Level :10
MSTI ID     Vid list
-------     -----------
    CIST     1-102,105-107,110-849,851-4094
       1     103,108,850
       2     104,109

-------------------------------------------------------------------------
DLink3526-kr2:
# STP
config stp maxage 20 maxhops 20 forwarddelay 15 txholdcount 3 fbpdu enable
config stp version mstp
config stp priority 32768 instance_id 0
config stp lbd enable
config stp lbd_recover_timer 60
create stp instance_id 1
config stp instance_id 1 add_vlan 103
config stp instance_id 1 add_vlan 108
config stp instance_id 1 add_vlan 850
config stp priority 32768 instance_id 1
create stp instance_id 2
config stp instance_id 2 add_vlan 104
config stp instance_id 2 add_vlan 109
config stp priority 32768 instance_id 2
config stp mst_config_id name region1 revision_level 10
enable stp
config stp ports 1-24 externalCost auto hellotime 1 edge true p2p true state disable
config stp ports 1-24 lbd disable
config stp mst_ports 1-26 instance_id 0 internalCost auto priority 128
config stp ports 1-24 fbpdu disable
config stp ports 25-26 externalCost auto hellotime 1 edge false p2p true state enable
config stp ports 25-26 lbd enable
config stp ports 25-26 fbpdu enable
config stp mst_ports 1-26 instance_id 1 internalCost auto priority 128
config stp mst_ports 1-26 instance_id 2 internalCost auto priority 128

Configuration Name : [region1                         ]  Revision Level :10
MSTI ID     Vid list
-------     -----------
    CIST     1-102,105-107,110-849,851-4094
       1     103,108,850
       2     104,109
-------------------------------------------------------------------------

MST00
  Spanning tree enabled protocol mstp
  Root ID    Priority    24576
             Address     0011.5cad.d0c0
             This bridge is the root
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

  Bridge ID  Priority    24576  (priority 24576 sys-id-ext 0)
             Address     0011.5cad.d0c0
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1            Desg FWD 2000000   128.1    Edge P2p
Fa0/2            Desg FWD 2000000   128.2    Edge P2p
Fa0/3            Desg FWD 2000000   128.3    Edge P2p
Fa0/4            Desg FWD 200000    128.4    Edge P2p
Fa0/5            Desg FWD 200000    128.5    P2p Bound(RSTP)
Fa0/6            Desg FWD 200000    128.6    P2p Bound(RSTP)
Fa0/7            Desg FWD 200000    128.7    Edge P2p
Fa0/23           Desg FWD 200000    128.23   P2p
Fa0/24           Desg FWD 200000    128.24   P2p

MST01
  Spanning tree enabled protocol mstp
  Root ID    Priority    24577
             Address     0011.5cad.d0c0
             This bridge is the root
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

  Bridge ID  Priority    24577  (priority 24576 sys-id-ext 1)
             Address     0011.5cad.d0c0
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/5            Boun FWD 200000    128.5    P2p Bound(RSTP)
Fa0/6            Boun FWD 200000    128.6    P2p Bound(RSTP)
Fa0/23           Desg FWD 200000    128.23   P2p
Fa0/24           Desg FWD 200000    128.24   P2p

MST02
  Spanning tree enabled protocol mstp
  Root ID    Priority    24578
             Address     0011.5cad.d0c0
             This bridge is the root
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

  Bridge ID  Priority    24578  (priority 24576 sys-id-ext 2)
             Address     0011.5cad.d0c0
             Hello Time   1 sec  Max Age  7 sec  Forward Delay  5 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/5            Boun FWD 200000    128.5    P2p Bound(RSTP)
Fa0/6            Boun FWD 200000    128.6    P2p Bound(RSTP)
Fa0/23           Desg FWD 200000    128.23   P2p

-----------------------------
Dlink-kr1

STP Instance Settings
---------------------------
Instance Type          : CIST
Instance Status        : Enabled
Instance Priority      : 32768(bridge priority : 32768, sys ID ext : 0 )

STP Instance Operational Status
--------------------------------
Designated Root Bridge : 24576/00-11-5C-AD-D0-C0
External Root Cost     : 200000
Regional Root Bridge   : 32768/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32768/00-15-E9-4A-EC-13
Root Port              : 26
Max Age                : 7
Forward Delay          : 5
Last Topology Change   : 3589
Topology Changes Count : 47

Command: show stp instance_id

STP Instance Settings
---------------------------
Instance Type          : MSTI(1)
Instance Status        : Enabled
Instance Priority      : 32769(bridge priority : 32768, sys ID ext : 1 )

STP Instance Operational Status
--------------------------------
Regional Root Bridge   : 32769/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32769/00-15-E9-4A-EC-13
Root Port              : 26
Remaining Hops         : 19
Last Topology Change   : 3595
Topology Changes Count : 39

Command: show stp instance_id

STP Instance Settings
---------------------------
Instance Type          : MSTI(2)
Instance Status        : Enabled
Instance Priority      : 32770(bridge priority : 32768, sys ID ext : 2 )

STP Instance Operational Status
--------------------------------
Regional Root Bridge   : 32770/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32770/00-15-E9-4A-EC-13
Root Port              : 26
Remaining Hops         : 19
Last Topology Change   : 3605
Topology Changes Count : 24

---------------------------
Dlink-kr2

Command: show stp instance_id

STP Instance Settings
---------------------------
Instance Type          : CIST
Instance Status        : Enabled
Instance Priority      : 32768(bridge priority : 32768, sys ID ext : 0 )

STP Instance Operational Status
--------------------------------
Designated Root Bridge : 24576/00-11-5C-AD-D0-C0
External Root Cost     : 200000
Regional Root Bridge   : 32768/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32768/00-15-E9-4A-EC-13
Root Port              : 26
Max Age                : 7
Forward Delay          : 5
Last Topology Change   : 3639
Topology Changes Count : 47

Command: show stp instance_id

STP Instance Settings
---------------------------
Instance Type          : MSTI(1)
Instance Status        : Enabled
Instance Priority      : 32769(bridge priority : 32768, sys ID ext : 1 )

STP Instance Operational Status
--------------------------------
Regional Root Bridge   : 32769/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32769/00-15-E9-4A-EC-13
Root Port              : 26
Remaining Hops         : 19
Last Topology Change   : 3643
Topology Changes Count : 39

Command: show stp instance_id

STP Instance Settings
---------------------------
Instance Type          : MSTI(2)
Instance Status        : Enabled
Instance Priority      : 32770(bridge priority : 32768, sys ID ext : 2 )

STP Instance Operational Status
--------------------------------
Regional Root Bridge   : 32770/00-15-E9-4A-EC-13
Internal Root Cost     : 200000
Designated Bridge      : 32770/00-15-E9-4A-EC-13
Root Port              : 26
Remaining Hops         : 19
Last Topology Change   : 3649
Topology Changes Count : 24