cvbStpForwardingMap 1.3.6.1.4.1.9.9.56.1.1.1.1.2

An indication of which ports are forwarding by spanning tree for the specified VLAN. The octet string contains one bit per port on the bridge for the specified VLAN. Each octet within the value of this object specifies a set of eight ports, with the first octet specifying ports 1 through 8, the second octet specifying ports 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered port, and the least significant bit represents the highest numbered port. The bit value interpretation is related to RFC 1493 dot1dStpPortState values is as follows: 1 = forwarding 0 = disabled, blocking, listening, learning, broken, or nonexistent