A-12
A
PPENDIX
A: P
ACKET
F
ILTER
O
PCODES
, E
XAMPLES
,
AND
S
YNTAX
E
RRORS
Address Group
Filter
This filter accepts only frames whose source and destination address are in
the same group.
name
“Forward Same Source and Destination”
pushSAGM
# Get source address group mask
pushDAGM
# Get destination address group
# mask
and
# Compare if source and
destination
# groups are common members of
# an address group (result is
# either zero or non-zero)
# address group masks
pushLiteral.l
0
# Put a zero on the stack
ne
# If not equal, returns a “one”
# to stack, resulting in packet
# forwarded
Port Group Filter
This filter discards all frames sourced from a port in either group three or
eight.
name
“Discard Port Groups 3 and 8”
pushSPGM
# Get source port group mask
pushLiteral.l
0x0084
# Select bits 3 and 8
and
# If port group bits 3 & 8 are
# common with SPGM, then
# non-zero value is
# pushed onto stack
pushLiteral.l
0
# Push zero
eq
# Only if SPGM is not in port
# groups corresponding to bits
# 3 & 8, then packet is
# forwarded
Summary of Contents for SUPERSTACK 2200
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Page 173: ...13 12 CHAPTER 13 CONFIGURING ADDRESS AND PORT GROUPS TO USE IN PACKET FILTERS ...
