Optimizing The Filter With Accept And Reject Commands - 3Com corebuilder 3500 Implementation Manual

Hide thumbs Also See for corebuilder 3500:

Table of Contents

Optimizing the Filter

with Accept and

Reject Commands

Combining All the Filters

Together, the 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:

"Discard XNS & IP broadcast pkts w/in socket range"

2 Perform steps 2 through 8 as described earlier in "Packet Filter One."

3 Perform steps 2 through 8 as described earlier in "Packet Filter Two."

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

# compare if XNS & in range

5 Perform steps 2 through 4 as described earlier in "Combining a Subset of

the Filters."

6 Add an or statement:

# determine if the type field is either XNS or IP

7 Add a not statement to discard any matching packets:

# discard if (IP & in range) or (XNS & in range)

The complete packet filter discards IP and XNS packets that are within the

specified range.

The following combination filter performs the same function but uses the

possible to save processing time.

commands to exit the filter as soon as