3Com 4007, Руководство по внедрению, Страница: 326 / 684

326 C
HAPTER
15: P
ACKET
F
ILTERING
pushDPGM 1 byte Pushes the destination port group mask (DPGM) onto
the top of the stack. The DPGM is a bitmap
representing the groups to which the destination port
of a packet belongs. Pushes 4 bytes on to the stack.
Each port group mask is represented by a single bit in
the DPGM bitmap. Port group masks are assigned to
the bitmap in sequence, starting with port group mask
1 as the least significant bit through port group mask
32 as the most significant bit.
Use
pushDPGM
to filter by port groups. See “Using
Port Groups in Custom Packet Filters” for more
information.
eq (equal) 1 byte Pops two values from the stack and compares them. If
they are equal, a byte containing the non-zero value is
pushed onto the stack; otherwise, a byte containing 0
is pushed. The contents of the stack determines the
size of the operands.
ne (not equal) 1 byte Pops two values from the stack and compares them. If
they are not equal, a byte containing the non-zero
value is pushed onto the stack; otherwise, a byte
containing 0 is pushed. The size of the operands is
determined by the contents of the stack.
lt (less than) 1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is less than the
second, a byte containing the non-zero value is pushed
onto the stack; otherwise, a byte containing 0 is
pushed. The contents of the stack determine the size
of the operands.
le (less than or equal
to) 1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is less than or equal to
the second, a byte containing the non-zero value is
pushed onto the stack; otherwise, a byte containing 0
is pushed. The contents of the stack determine the size
of the operands.
gt (greater than) 1 byte Pops two values from the stack and performs an
unsigned comparison. If the first is greater than the
second, a byte containing the non-zero value is pushed
onto the stack; otherwise, a byte containing 0 is
pushed. The contents of the stack determine size of
the operands.
Table 66 Packet Filtering Opcodes (continued)
Opcode
Memory
Requirements
Description