Routing CobraNet protocol throught core swicth and distribution

[licences-CM]

We are having issues with the CobraNet protocol used for our intercom system across two campuses. The system is working correctly on the main campus, but when we try to broadcast a message to the second campus, the message is not reaching its destination. The Vocia amplifiers are connected to a specific VLAN, and the VLAN is allowed on the trunk link between the two campuses. When we checked the ARP table on both campuses, we found that all the MAC addresses of the Vocia amplifiers are present, indicating that there is no Layer 2 blocking. We would like to know if we have missed anything regarding the CobraNet protocol, since communication needs to traverse the core switch to reach the other campus.

[Flavio Miranda]

Hi

 Never worked with this protocol before. But here is what we can read about:

"However, since CobraNet does not use IP protocol, its packets cannot travel through routers, and therefore it is limited to use on a LAN; CobraNet cannot be used over the Internet. The network over which CobraNet is transmitted must be able to operate at a minimum of 100 Mbit/s. All CobraNet packets are identified with a unique Ethernet protocol identifier (0x8819) assigned to Cirrus Logic.[13]"

That being said, I'd recommend you to make sure this traffic is actually travelling through Layer2 end-to-end. Which means, you need to plug your device in one port in a specific vlan and this vlan need to run all the way down to the other site and you need to put the other end device on the same vlan in a specific port.