Description: This object specifies a string of octets containing one bit per Bridge domain per service instance(generally we have one bridge domain per non-trunk service instance but can have more than one bridge configured with a trunk service instance). The first octet corresponds to Bridge domains with Bridgedomain ID values of 2048 through 2055; the second octet to Bridge domains 2056 through 2063; etc. Thus, this 128-octet bitmap represents bridge domain ID value 2048~3071.

For each Bridge domain configured, the bit corresponding to that bridge domain is set to 1. SNMP Administrator uses cevcSIForwardBdNumberBase + (position of the set bit in bitmap)to calculate BD number of a service instance.

Note that if the length of this string is less than 128 octets, any 'missing' octets are assumed to contain the value zero. An NMS may omit any zero-valued octets from the end of this string in order to reduce SetPDU size, and the agent may also omit zero-valued trailing octets, to reduce the size of GetResponse PDUs.