This object specifies the ToS-Byte value used for peer-keepalive
messages.
Only low eight-bit byte of this double word is used. Bit 0 is reserved.
Bits 1 to 5 represent the value of cVpcPeerKeepAliveTos. Bits 6 to 8
come into cVpcPeerKeepAlivePrecedence. ToS-Byte indicates the value of
the whole byte including ToS, Precedence and reserved bit 0.