有人可以帮忙解决这个问题吗？
我有 2 台 HP Procurve 交换机 2650 和一台 Cisco 交换机 2950，它们像这样连接在一起：HP MST 根 (prio 16384) <-> HP IST 根 (prio 24576) Trk1 <-> Po1 Cisco IST 成员 (prio 32768)。它们都配置了 MSTP。我的问题是 Cisco 交换机声称自己是 IST 主交换机：
C2950C24_01#show span mst
###### MST00 vlans mapped: 1-4094
Bridge address 000a.b7b8.4e40 priority 32768 (32768 sysid 0)
Root address 0015.6033.dc00 priority 16384 (16384 sysid 0)
port Po1 path cost 120000
IST master this switch
Operational hello time 2, forward delay 7, max age 12
Configured hello time 2, forward delay 7, max age 12, max hops 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/4 Desg FWD 200000 128.4 Edge P2p
Fa0/5 Desg FWD 200000 128.5 Edge P2p
Fa0/8 Desg FWD 200000 128.8 Edge P2p
Fa0/9 Desg FWD 200000 128.9 Edge P2p
Fa0/10 Desg FWD 200000 128.10 P2p
Fa0/11 Desg FWD 200000 128.11 Edge P2p
Fa0/13 Desg FWD 200000 128.13 Edge P2p
Fa0/14 Desg FWD 200000 128.14 Edge P2p
Fa0/15 Desg FWD 200000 128.15 Edge P2p
Fa0/17 Desg FWD 200000 128.17 Edge P2p
Fa0/18 Desg FWD 200000 128.18 Edge P2p
Fa0/20 Desg FWD 200000 128.20 Edge P2p
Fa0/21 Desg FWD 2000000 128.21 Edge Shr
Fa0/22 Desg FWD 200000 128.22 Edge P2p
Po1 Root FWD 100000 128.65 P2p Bound(RSTP)
C2950C24_01#
即使它从具有较低优先级的中间 HP 交换机接收到 BPDU。（现在让我们忽略 MST 根 - 左侧 HP 交换机）
C2950C24_01#sh spanning-tree det
MST00 is executing the mstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 0, address 000a.b7b8.4e40
Configured hello time 2, max age 12, forward delay 7
Current root has priority 16384, address 0015.6033.dc00
Root port is 65 (Port-channel1), cost of root path is 120000
Topology change flag not set, detected flag not set
Number of topology changes 14 last change occurred 09:52:38 ago
from Port-channel1
Times: hold 1, topology change 19, notification 2
hello 2, max age 12, forward delay 7
Timers: hello 0, topology change 0, notification 0
.
.
Port 65 (Port-channel1) of MST00 is root forwarding
Port path cost 100000, Port priority 128, Port Identifier 128.65.
Designated root has priority 16384, address 0015.6033.dc00
--> Designated bridge has priority 24576, address 001f.281e.4100
Designated port id is 64.51, designated path cost 20000
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default, Boundary RSTP
BPDU: sent 36733, received 18973
C2950C24_01#
以下是中间 HP 开关的输出：
H2650G48_12# sh span
Multiple Spanning Tree (MST) Information
STP Enabled : Yes
Force Version : MSTP-operation
IST Mapped VLANs : 1-4094
Switch MAC Address : 001871-218080
Switch Priority : 32768
Max Age : 12
Max Hops : 20
Forward Delay : 7
Topology Change Count : 659
Time Since Last Change : 10 hours
CST Root MAC Address : 001560-33dc00
CST Root Priority : 16384
CST Root Path Cost : 20000
CST Root Port : 49
IST Regional Root MAC Address : 001f28-1e4100
IST Regional Root Priority : 24576
IST Regional Root Path Cost : 20000
IST Remaining Hops : 19
Root Guard Ports :
TCN Guard Ports :
BPDU Protected Ports :
BPDU Filtered Ports :
PVST Protected Ports :
PVST Filtered Ports :
| Prio | Designated Hello
Port Type | Cost rity State | Bridge Time PtP Edge
---- --------- + --------- ----- ---------- + ------------- ----- --- ----
.
.
Trk1 | 200000 64 Forwarding | 001871-218080 2 Yes No
H2650G48_12#
以下是 Cisco 和中间 HP 交换机的运行配置。那里可能出了什么问题？
C2950C24_01#sh run
Building configuration...
Current configuration : 5237 bytes
!
version 12.1
.
.
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
spanning-tree mst configuration
name LKN1
revision 1
!
中间的HP开关：
H2650G48_12# sh run
Running configuration:
; J4899B Configuration Editor; Created on release #H.10.119
.
.
trunk 45-46 Trk1 LACP
.
.
spanning-tree
spanning-tree protocol-version MSTP
.
.
spanning-tree Trk1 priority 4
spanning-tree config-name "LKN1"
spanning-tree config-revision 1
H2650G48_12#
谢谢您的意见
答案1
您的优先级相同，因此最低的 Mac 获胜，即思科。
思科
Bridge Identifier has priority 32768, sysid 0, address 000a.b7b8.4e40
慧与
Switch MAC Address : 001871-218080
Switch Priority : 32768
我必须对此进行实验以确认，但我认为您可以通过在 HPE 上将 trk1 优先级降低到 2 或 3 或强制实例上的优先级来解决这个问题。
spanning-tree instance 1 priority 1