can anybody help with this issue?
I have 2 HP Procurve switches 2650 and one Cisco switch 2950 connected together like this: HP MST root (prio 16384) <-> HP IST root (prio 24576) Trk1 <-> Po1 Cisco IST member (prio 32768). There is a MSTP configured on all of them. My problem is that the Cisco switch claims itself to be the IST master:
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#
Even if it receives BPDUs from the middle HP switch that has got lower prio. (Lets ignore now the MST root - left HP switch)
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#
Here is the output from the middle HP switch:
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#
Here are the running-configs of the Cisco and the middle HP switch. What could be wrong there ??
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
!
The middle HP switch:
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#
Thank you for your comments
