The value of the object svcTlsStpBridgeInstanceId
indicates a 12 bit value chosen by the the system. It is
part of the STP bridge Id, which consists of 8 octets:
- 4 highest bits of octet 1:
the bridge priority (ref svcTlsStpPriority)
- 12 bits (4 lowest bits of octet 1 + 8 bits of octet 2):
bridge instance Id (this object!).
- 6 octets: bridge MAC addess
ref svcTlsStpBridgeAddress
The value is set to 0 if svcTlsStpOperStatus is not 'up'.