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The Avaya Multiservice switch provides 60K of memory that is used to store hash tables and AFT buckets. In general, no more then 20K should be used for Hash Tables, leaving 40K available for AFT entries (MAC addresses). It is important to take into consideration the number of VLANs that the switch will have when determining the hash table size for each VLAN, as the total amount of memory used for the Hash Tables should not exceed 20K. As more VLANs are created, the smaller each VLANs Hash Table should be.
Important: Avaya recommends that you not allow the total hash table memory usage to exceed 20K. More than 20K will limit the potential for growth (i.e., address learning). If your Avaya Multiservice switch is approaching this threshold, adjust the Initial Hash Table Size accordingly.
For example, if you anticipate creating more than 20-30 VLANs, the Initial Hash Table Size default setting must be reduced. The rule of thumb is the following formula:
Number of VLANs times Initial Hash Table Size <20K
Note: When you create a VLAN, there are 18 internal MAC entries automatically created for that VLAN. If you were to configure Example 2, the switch would indicate that 36K of memory is currently in use. This is because you have 16K of memory for the VLAN Hash Tables and another 20K of memory used for the 18,000 MAC entries.
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