This object contains a bitmap indicating all the VIPs in the range 4095 through 20478 that are associated with this PIP. The bits correspond to Bridge Port numbers in the range 4095 through 20478. The high-order bit of the first octet corresponds to port number 1, and subsequent bits of the octet string correspond to subsequent port numbers. The following formula can be used to find the bit corresponding to a particular port number B: octet[(B-4095)/8] & (1 >> ((B-4095)%8)) If the bit for a particular port number is 1, that VIP is associated with this PIP. Note that ports numbers greater than 4094 cannot be used with xSTP. The value of this object may be truncated to remove trailing octets of all zeros.