3Com 4007, Implementation Manual, Page: 312 / 684

312 C
HAPTER
15: P
ACKET
F
ILTERING
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Deleting packet filters — Deleting a packet filter removes the filter
from the module. A filter cannot be deleted if it is assigned. You must
unassign the filter from any ports before you can delete the filter. Use
the
bridge packetfilter delete
command.
■
Editing, checking, and saving custom packet filters — You can
use the built-in line editor to edit custom packet filters. After you save
the custom packet filter, the software examines it for syntax errors.
The module software does not allow you to assign the packet filter to
a port until the filter is error-free. Use the
bridge packetfilter edit
command.
You can also edit a packet filter using an ASCII-based text editor such
as EMACS, vi, or Notepad.
■
Loading packet filters — After you create custom packet filters
using an external text editor or Filter Builder, you must download the
filters using the TFTP file transfer protocol onto the system from the
network host on which you created them. When you have loaded it,
the packet filter definition is converted into the internal format that is
used by the packet filter code. Use the EME’s
download
command to
transfer the filter to the Switch 4007, then the
bridge packetfilter
load
command to transfer it from the EME to the Multilayer Switching
Module.
■
Assigning packet filters — When you assign a packet filter to one
or more ports, you must select the ports and a processing path. For
descriptions of the available packet processing paths, see Table 61 at
the beginning of this chapter. Each path of each port can have only
one packet filter assigned to it; however, you can assign a single
packet filter to multiple paths and ports. Use the
bridge
packetfilter assign
command.
■
Unassigning packet filters from ports — To unassign a packet filter
from one or more ports, the packet filter must have been assigned to
at least one port. Use the
bridge packetfilter unassign
command.
■
Defining port groups — Before you assign packet filters that refer to
port groups, create the port groups. See “Defining Port Groups” later
in this chapter for more information.
See the Switch 4007 Command Reference Guide for more information
about using these commands and management functions.