Avaya P580 - Manual (Page 238)

6-8 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1
Chapter
parameters: Auto-Increment, Trigger (Multiplier), and Threshold
(Util%) in the Address Forwarding Table Configuration
Figure 6-12. Address Forwarding Table Configuration
Auto-Increment
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.
Refer to figure 6-1 for enabling or disabling
Auto-Increment HT size.
Trigger
(Multiplier)
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.
Threshold
(Util%)
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.