Avaya 580 사용자 설명서

9-8

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1

Chapter 9

Auto-Increment is the Enable/Disable setting for the Auto-Sizing feature. If 
Auto-Increment is enabled, the switch will automatically increase the hash 
table size provided two conditions are met.See 

 for enabling or 

disabling Auto-Increment HT size.

The first condition is the Trigger (Multiplier), which sets a minimum 
threshold for the number of learned entries a VLAN must have before the 
switch will consider increasing the Hash Table size. This prevents the 
Avaya Multiservice Switch from resizing Hash Tables for VLANs who 
have only a few AFT entries. This threshold is 12 times the Hash Table size.

For Example: If a VLAN is created with an Initial Hash Table Size of 64, 
the trigger would be 12 times 64 = 768 learned entries. If there are more 
than 768 learned entries, the second condition is evaluated.

The second condition is met if Bucket Utilization drops below the 
Threshold (Util%), which by default is 40%. The switch will compensate 
for the poor utilization by doubling the Hash Table. 40% is recommended 
for most applications.

Resizing results in the switch utilizing AFT memory more efficiently. When 
the switch resizes the Hash Table, all entries are flushed and must be 
relearned.