For some backstory I work for a small IT company, our client has a lot of aged Cisco kit throughout 4 sites. We won a contract to provide them with Aruba kit (which we have since outsourced to a 3rd party to configure and install - we will then support). In the meantime we provided them with an Aruba on one of their smaller sites to give added capacity.
The network is very small, 2x 48 port Cisco, 1x 8 port Cisco and now a 24 port Aruba2930F. The Cisco's run rapid pvst+.
At the moment not many devices are connected into the Aruba but there is a recurring issue where the Cisco blocks the uplink to the Aruba, when I run sh spanning tree on the Cisco I get "BKN4 P2P *LOOP_Inc for the port in question on VLAN 51.
We have seen the same issue in the past and have just manually shut the port off and on which tended to resolve it for maybe month or so but it doesn't seem to be resolving anymore.
I feel the cause may be because spanning tree has not been configured on the Aruba, in Aruba central under device\ interface\ Spanning-tree the only option is MSTP. From what I can see this is compatible with rapid pvst+ but Aruba central only seems to give me the option to enable and select a priority of 0-15, the rest of the config options are for each interface. I suppose I'm worried about root bridge election and what might happen, I don't want to bring the network down!
I'm wondering if anyone has any experience with Aruba central and if perhaps you have any tips on enabling spanning tree to work with Cisco, I have done a fair bit of searching and did find an interops guide but didn't go into a huge amount of detail, just to enable and create an instance for each vlan.
Training is going to be provided by the 3rd party we outsourced the work to but this will probably be in the new year, if anyone could send me in the right direction for now I'd hugely appreciate it!
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