Add visual indicator for MACSEC/TRUSTSEC encrypted ports

It would be great to have some kind of indicator for which ports are protected via MACSEC… like a lock icon or something next to port description.

It looks like the relevant data comes from the CISCO-TRUSTSEC-INTERFACE-MIB mib. ctsiIfConfiguredMode returns 4 if the port is configured. ctsiIfSapNegotiationStatus returns a 4 for negotiation success.

You could have something like a configured port indicated as an open lock in red if the port is configured but with unsuccessful negotiation and flip it to a green closed lock if neg is successful.