3com 2200 用户手册

Combining All the Filters.  Together, the four packet filters work to 
perform the solution to the problem: filtering the broadcast packets from 
the market data servers. These steps show how to create this filter:

1 Name the filter:

2 Perform steps 2 through 4 as described in “Packet Filter One” on page 12-14.

3 Perform steps 2 through 8 as described in “Packet Filter Two” on page 12-15.

4 Add an and statement to compare the results of step 2 and the results of 

step 3:

5 Perform steps 2 through 4 as described in “Combining a Subset of the 

6 Add an or statement:

7 Add a not statement to discard any matching packets:

The complete packet filter that discards IP and XNS packets that are within 
the specified range is shown on page 12-13.

You can create a new packet filter using either an ASCII-based text editor 
(such as EMACS or vi ) or the line editor built into the Administration 
Console. Using an ASCII-based text editor allows you to create multiple 
copies of the packet filter definition, which you can then copy onto one or 
more Switch 2200 systems from a networked workstation. This method also 
allows you to archive copies of filter definitions.

The built-in text editor provides a minimal set of editing functions that you 
can use to edit a packet filter definition one line at a time. A single line is 
limited to no more than 79 characters. The number of lines is limited only 
by available memory.