Hi all, I am experiencieng MSTP protocol abnormality in integrating 3rd party SW units connected to Cisco7609-1 and Cisco7609-2. Cisco 7609-1 is the bridge root since spanning tree priority is set to lowest value than Cisco 7609-2. The two SWU are connected to both Cisco 7609 routers for redundancy purposes with bridge priority set to 32768. SWU-1 i/f1 is connected to C7609-1 and i/f2 is connected to C7609-2 with higher path cost configured on SWU-1 i/f2. SWU-2 i/f1 is connected to C7609-1 with higher path cost and i/f2 of SWU-2 is connected to C7609-2.
All active vlan is assigned to instance 1 of MSTP. When checking the MSTP parameters on SWU1 and SWU2, showing instance 0 and 1 as "regional root".
Any suggestion/recomendation will be appreciated...
as I've explained in the second part of my first post you need to associate at least one vlan with IST instance 0 otherwise no BPDUs will be sent out on the trunk port and every switch will claim to be the root bridge because they are isolated.
So I would suggest the following:
- create a new vlan 500 for example on all switches.
- associate the vlan with IST istance 0 this on the 6509 is done in mst region config mode
- add the vlan to permitted vlan list on the trunk ports on all devices
By doing so the BPDUs should start to flow and the correct root bridge ID should be accepted by all devices for the vlans of interest.
No, you don't need to configure a vlan on instance 0 in order to get the switch to send MST BPDUs. Instance 0 is sent on every link, regardless of the MST configuration.
Here, the SWU switches consider themselves as part of a different MST region, that's why they think they are regional root. The fact that the role of one of their uplink is "master" proves that (the master port is the "root" port for the region, when considering the region as a virtual bridge).
I would suggest you triple check your MST configuration on both side. Name, revision number and vlan to instance mapping must match on the switches. I think Giuseppe other suggestion (the pre-standard MST version) might be the issue if you are sure your config match.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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