Avaya P580 User Manual download pdf (Page 238)

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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.

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