The maximum message length is 64 kbytes. Mandatory Parameters Variable length set of required message parameters. Some messages have no required parameters. For messages that have required parameters, the required parameters MUST appear in the order specified by the individual message specifications in the sections that follow. Optional Parameters Variable length set of optional message parameters.
Many messages have no optional parameters.
For messages that have optional parameters, the optional parameters may appear in any order. The sections following that define TLVs specify a value for the U-bit. F bit Forward unknown TLV bit. This bit applies only when the U bit is set and the inter domain bandwidth broker message containing the unknown TLV is to be forwarded. The sections following that define TLVs specify a value for the F-bit.