Alcatel Unleashed

Hi Guys,

Cisco1 ---- Cisco2
| |
| |
ALU3 ----- ALU4 (6900's running SPB)
| |
| |
ALU1 ----- ALU2 (6900's running SPB)
| |
| |
DHL Link
ALU - 6850x2

Apologies for the diagram above.

Basically I have 4x6900's running SPB and a 6850x2 stack connecting to the bottom two 6900's via DHL link.

Now, the issue I have is with the 2x6900's connecting to the 2x Cisco 4500's. (NB: The Cisco 4500's are running IOS and they have "extend-system-ID" enabled and are running pvst+ over the 802.1q links to the ALU boxes).

I have also turned one pvst+ compatability on the ALU ports connecting to the Cisco 4500's.

I have made say vlan 90 the native vlan on all of the links in the diagram above.

Cisco1 has been configured to be the root bridge for vlan 90 and rightfully the link between Cisco2 and ALU4 was blocked.

However, ALU2 also assumed root bridge status for vlan 90. I don't have enough experience with ALU SPB but this seemed quite wrong...

Then, when I allowed a tagged vlan on the links connecting the Cisco and ALU devices we had spanning tree issues and also HSRP issues which are running on the Cisco 4500's. We then had to immediately shut the two ports on the Cisco 4500's connecting to the ALU switches.

The reason for the above topology is for us to migrate from Cisco to ALU and move servers from the Cisco network to ALU network in another location...

Has anyone tried to do anything similar?

Any inputs / suggestions will be appreciated. Has anything been overlooked?

Thankyou

I assume that the PVST+ is not seen as "BPDU" but as "Cisco PDU" and hence dropped by the default policy on the SPB ports.

Please review the "service access l2profile" in the documentation and your configuration.

B