I am running an MST interoperability test between a 3com 7700 and Cisco 6500
but I am not having much luck in getting it to work. What I am trying to
achieve is balanced traffic across two vlans which have been configured has
MST instance 1 and 2 (see below for full config commands used.
It is my understanding that with STP there should only ever be one Root
Bridge in a STP topology, however I am seeing two with both the Cisco and
3com devices claiming to be the Root Bridge.
I would be interested to hear from anyone who has any exposure to MST
configuration in either a multi-vendor or Cisco only environment.
I have also been trying to find out some more information about the
"Configuration Digest Signature Key" which is used in MST. I know it is a
type of HMAC-MD5 encryption facility, but I have no idea about its working
in and MST environment. Any help, which can be offered on this matter, would
also be gratefully accepted
Thanks
Roy
Cisco Config
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
!
spanning-tree mst configuration
name Test
instance 1 vlan 3
instance 2 vlan 4
interface GigabitEthernet3/1
no ip address
switchport
switchport access vlan 3
!
interface GigabitEthernet3/2
no ip address
switchport
switchport access vlan 4
!
3com config
stp timer forward-delay 700
stp timer max-age 1000
stp enable
stp region-configuration
region-name Test
instance 1 vlan 3
instance 2 vlan 4
active region-configuration
interface GigabitEthernet3/0/1
port access vlan 3
#
interface GigabitEthernet3/0/2
port access vlan 4
#
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