Instruction/ maintenance manual of the product x900-24 series Allied Telesis
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C613-16058-00 REV C www .alliedtelesis.com AlliedW ar e TM OS How T o | Intr oduction The A T -9900, x900-48, and x 900-24 series switches supp or t a po werful har dware based pack et-filtering facility .
Page 2 | AlliedW are™ OS How T o Note: Har dware Filters Intr oduction What information will y ou find in this document? This document contains the following: Intr oduction .......... .................................................................
Page 3 | AlliedW are™ OS How T o Note: Hardwar e Filters Cre ating dedicated har dware filte rs Cr eating dedicated hardwar e filters Befor e we get into the details of the filter creation, w e need to lo ok at the underlying pack et classification process.
Page 4 | AlliedW are™ OS How T o Note: Hardwar e Filters Cre ating dedicated har dware filte rs Configuring La y er 4 sour ce and destination por t number masks A common filtering re qui r ement is the ability to filter on a range of TCP or UDP port numbers.
Page 5 | AlliedW are™ OS How T o Note: Hardwar e Filters Cre ating dedicated har dware filte rs z When pack ets arrive at a customer port of a nested VLAN, the “i nner” parameters will match the attributes of the first tag in the packets.
Page 6 | AlliedW are™ OS How T o Note: Hardwar e Filters Cre ating dedicated har dware filte rs The logic of the operation of the hardwar e filters The operation of the filters follows the standar d A CL log ic: if a pack et matches an filter , the comparison pr ocess stops and the action attached to the filter is performed.
Page 7 | AlliedW are™ OS How T o Note: Hardwar e Filters Combining har dware filters and QoS Combining har dware filters and QoS The switch compar es the pack et with ev er y hard ware filter befor e it compares the pack et with any QoS flow group .
Page 8 | AlliedW are™ OS How T o Note: Hardwar e Filters Ho w many filters can you cr eate? Extra rules used when combin ing QoS and hardwar e filters In fact, QoS can cause the limit o n t he n u m be r o f ha r d wa r e f i l t e rs t o b e re d uc e d r a th e r m o re radically than might be initially evident.
Page 9 | AlliedW are™ OS How T o Note: Hardwar e Filters Ho w many filters can you cr eate? The following figur e shows the copies of these rules. When a QoS policy has been applied to ports 4 and 5.
Page 10 | AlliedW are™ OS How T o Note: Hardwar e Filters Ho w many filters can you cr eate? Pr oto col type—2 b ytes Ethernet format—2 bytes VLAN ID—2 bytes IP pr otocol type (TCP , UDP , etc.
Page 11 | AlliedW are™ OS How T o Note: Hardwar e Filters Ho w many filters can you cr eate? Oka y length For example, this set of filters would w ork: sour ce MAC ad dress source UDP port destinati.
Page 12 | AlliedW are™ OS How T o Note: Hardwar e Filters Ho w many filters can you cr eate? How to see the cur rent filter r esource usage on the s witch The sho w switch command outp uts a number of counters that display the cur rent usage of filtering r esources.
Page 13 | AlliedW are™ OS How T o Note: Hardwar e Filters Appendix A: How to use the la yer 4 mask in classifiers Appendix A: How to use the la y er 4 mask in classifiers This section describes the use of L4 mask in classifiers and gives some examples on L4 masks.
Page 14 | AlliedW are™ OS How T o Note: Hardwar e Filters Appendix A: How to use the la yer 4 mask in classifiers Example 1 : por ts 2000-2003 Let’ s say w e want to ha ve a UDP port range of 2000-2003, then the mask we need to h av e is: The changed bits from 2000-2003 ar e bolded.
Page 15 | AlliedW are™ OS How T o Note: Hardwar e Filters Appendix A: How to use the la yer 4 mask in classifiers Example 2: por ts 5004-5008 In some more complex situations, w e ma y need more than one classifier to cov er all the range w e want to .
Page 16 | AlliedW are™ OS How T o Note: Hardwar e Filters Appendix A: How to use the la yer 4 mask in classifiers So our bi ggest block fi ts into the range 5 1 2-767. The next second biggest block is 1 28 in our example … it should fit into 384-5 11 .
Page 17 | AlliedW are™ OS How T o Note: Hardwar e Filters Appendix A: How to use the la yer 4 mask in classifiers The following table sho ws the por t ranges for the largest blocks.
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