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Why it will use two 16-bit filters if select VLAN-ID and VLAN-priority both in Spirent Testcenter Analyzer?

Answer

In Spirent Testcenter version 3.70 or before, if user selects VLAN-ID and VLAN-priority for Analyzer, it will only consume one 16-bit filter. Actually if two filters (total less than 16 bits) are selected, the original logic is to combine the filters into one 16 bit filter. This won't work if the max value is not all 0xF. It was changed in 3.71 and later version by separating the filter if the max value is not all 0xF.

Thus the user will consume two 16-bit filters if select VLAN-ID and VLAN-priority both in Spirent Testcenter Analyzer.


Product : Spirent TestCenter