Avaya 580 Manuale Utente
9-8
User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1
Chapter 9
Figure 9-2. 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.See
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.
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.
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 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.
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.
the switch resizes the Hash Table, all entries are flushed and must be
relearned.